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WO2013004109A1 - Procédé et système de traitement d'un signal de référence dans un système mimo en boucle ouverte - Google Patents

Procédé et système de traitement d'un signal de référence dans un système mimo en boucle ouverte Download PDF

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Publication number
WO2013004109A1
WO2013004109A1 PCT/CN2012/075682 CN2012075682W WO2013004109A1 WO 2013004109 A1 WO2013004109 A1 WO 2013004109A1 CN 2012075682 W CN2012075682 W CN 2012075682W WO 2013004109 A1 WO2013004109 A1 WO 2013004109A1
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Prior art keywords
dmrs
ofdm
slot
odd
subcarriers
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PCT/CN2012/075682
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English (en)
Chinese (zh)
Inventor
郭森宝
陈艺戬
孙云锋
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division

Definitions

  • the present invention relates to the field of communications, and in particular, to a reference signal processing method and system for an open loop multiple input multiple output (MIMO) system.
  • MIMO multiple input multiple output
  • CRS Common Reference Signal
  • the UE User Equipment
  • the UE can perform channel measurement through the CRS, thereby determining that the UE performs cell reselection and handover to the target cell, and performs channel quality measurement in the UE connection state.
  • the interference level is high, the physical Layers can be disconnected through high-level related radio link connection failure signaling.
  • CSI-RS channel information reference signal
  • DMRS demodulation reference
  • the CSI-RS is used for the measurement of the channel
  • PMI Precoding Matrix Indicator
  • CQI Channel Quality Indicator
  • RI Rank Indicator
  • the DMRS can enable the UE to transparently receive downlink data without knowing the precoding weights applicable to the base station side, which can reduce the load of the PDCCH and reduce the weight limit of the codebook.
  • CRS is used for TM (transmission mode) 1 to TM6 transmission.
  • TM3 transmission mode is also demodulated by CRS.
  • TM1, TM2, TM4 to TM6 are performed.
  • DMRS-based optimization for the open-loop mode of TM3 In future versions, consider energy conservation, resource savings, etc. Due to many factors, CRS needs to fade out. Therefore, the open-loop transmission mode of TM3 needs to be designed based on DMRS, but there is no corresponding technical support, that is, the transmission of open-loop MIMO cannot be realized through DMRS, resulting in the common reference signal pilot band. The extra resources incurred are higher. Summary of the invention
  • the main object of the present invention is to provide a reference signal processing method and system for an open-loop MIMO system, which implements open-loop MIMO transmission through DMRS, thereby reducing additional resource overhead of the common reference signal pilot band.
  • a reference signal processing method for an open-loop multiple-input multiple-output MIMO system comprising: using an CDM and/or TDM and/or FDM technology in an ordinary subframe, even time slots 3, 4, 5 in one subframe 6 OFDM symbols, one or more OFDM symbols of the odd-numbered slots 0, 1, 2, 4, 5, 6 OFDM symbols are multiplexed with different sets of open-loop demodulation reference signals DMRS;
  • the open-loop DMRS uses the same or different weights and performs corresponding weighting.
  • the OFDM symbol carrying the open-loop DMRS is the ⁇ 5, 6 ⁇ OFDM symbol of the even slot and the ⁇ 5, 6 ⁇ OFDM symbol of the odd slot.
  • the open-loop DMRS is carried on the 0th to 11th subcarriers of the ⁇ 5, 6 ⁇ OFDM symbol of the even slot and the ⁇ 5, 6 ⁇ OFDM symbol of the odd slot, where the 0th to the 11th subcarriers respectively carry
  • the same precoding weight or beamforming weight is used in each DMRS group, and the same or different precoding weights or beamforming weights are used between the DMRS groups.
  • CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the ⁇ 5, 6 ⁇ OFDM symbol in the even slot. Multiplexing of two ports on adjacent two pilot resource elements of the same subcarrier and adjacent two pilots of the same subcarrier on the ⁇ 5, 6 ⁇ OFDM symbol The multiplexing of two ports on the resource element, the walsh code uses [1,1], [1,-1]; when each DMRS group contains more than two DMRS ports, then the walsh code is used to perform the even time slot.
  • 6 ⁇ OFDM symbol and octave slot ⁇ 5 6 ⁇ OFDM symbols on the same subcarrier four pilot resource elements are greater than two ports of multiplexing, walsh code using [1,1,1,1 ], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1].
  • open-loop MIMO for multiple layers
  • CDM multiplexing with orthogonal mask OCC length equal to 2 is used; for three-layer and four-layer cases, CDM multiplexing with OCC length equal to 4 is used, or CDM+FDM is used to reuse different DMRS port; for DMRS port ⁇ 0, 1 ⁇ , multiplexed in odd DMRS port group by CDM with OCC length equal to 2; for DMRS port ⁇ 2, 3 ⁇ , multiplexed with CDM with OCC length equal to 2
  • even DMRS port groups for the case of more than 4 layers, for DMRS ports ⁇ 0, 1, 4, 6 ⁇ , multiplexed in odd DMRS port groups with CDMs with OCC length equal to 4; for DMRS ports ⁇ 2, 3 , 5, 7 ⁇ , multiplexed in even DMRS port groups by CDM with OCC length equal to 4.
  • the open-loop DMRS is carried in the ⁇ 5, 6 ⁇ OFDM symbol of the OFDM even slot and the ⁇ 0, 1, 4, 5, 6, 7, 10, 11 of the ⁇ 5, 6 ⁇ OFDM symbol of the odd slot.
  • the ⁇ 0, 4 ⁇ , ⁇ 1, 5 ⁇ , ⁇ 6, 10 ⁇ , ⁇ 7, 11 ⁇ subcarriers carry 4 DMRS groups, and the subcarrier ⁇ 0, 4 ⁇ carries the DMRS group.
  • subcarrier ⁇ 1,5 ⁇ carries DMRS group 1
  • subcarrier ⁇ 6,10 ⁇ carries DMRS group 2
  • subcarrier ⁇ 7,11 ⁇ carries DMRS group 3
  • each DMRS group uses the same precoding weight or Beamforming weights, using the same or different precoding weights or beamforming weights between DMRS groups.
  • each DMRS group CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the OFDM in the even time slot ⁇ 5, 6 ⁇ OFDM. Multiplexing of two ports on adjacent two pilot resource elements of the same subcarrier on the symbol and adjacent two slots of the same subcarrier on the ⁇ 5, 6 ⁇ OFDM symbol on the ⁇ 5, 6 ⁇ OFDM symbol.
  • the multiplexing of two ports on the frequency resource element, the walsh code uses [1,1], [1,-1]; when each DMRS group contains more than two DMRS ports, then the walsh code is used for the even number.
  • the gap ⁇ 5, 6 ⁇ and the odd-slot ⁇ 5, 6 ⁇ four pilot resource elements of the same sub-carrier are multiplexed by more than two ports, and the walsh code uses [1, 1, 1, 1], [1, 1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1].
  • open-loop MIMO for multiple layers
  • CDM multiplexing with an OCC length equal to 2 is used;
  • CDM multiplexing with OCC length equal to 4 For the case of Layer 3 and Layer 4, use CDM multiplexing with OCC length equal to 4, or use CDM + FDM to multiplex different DMRS ports; For DMRS port ⁇ 0, 1 ⁇ , use CDM with OCC length equal to 2. The mode is multiplexed in the odd DMRS port group; for the DMRS port ⁇ 2, 3 ⁇ , it is multiplexed in the even DMRS port group by the CDM with the OCC length equal to 2; for the case of more than 4 layers, for the DMRS port ⁇ 0, 1 , 4,6 ⁇ , multiplexed in odd DMRS port groups by CDM with OCC length equal to 4; for DMRS ports ⁇ 2, 3, 5, 7 ⁇ , multiplexed in even DMRS with CDM with OCC length equal to 4 Port group.
  • the open-loop DMRS is carried on the ⁇ 0, 5, 6, 11 ⁇ subcarriers of the ⁇ 5, 6 ⁇ OFDM symbol of the even slot and the ⁇ 5, 6 ⁇ OFDM symbol of the odd slot, where the ⁇ 0 ⁇ , 5 ⁇ , ⁇ 6, 11 ⁇ subcarriers carry 2 DMRS groups, subcarrier ⁇ 0, 5 ⁇ carries DMRS group 0, subcarrier ⁇ 6, 11 ⁇ carries DMRS group 1, and each DMRS group adopts the same Precoding weights or beamforming weights, using the same or different precoding weights or beamforming weights between DMRS groups;
  • the open-loop DMRS is carried on the ⁇ 1, 5, 7, 11 ⁇ subcarriers of the ⁇ 5, 6 ⁇ OFDM symbol of the even slot and the ⁇ 5, 6 ⁇ OFDM symbol of the odd slot, where the ⁇ 1 5 ⁇ , ⁇ 7,11 ⁇ subcarriers carry 2 DMRS groups, subcarrier ⁇ 1,5 ⁇ carries DMRS group 0, subcarrier ⁇ 7, 11 ⁇ carries DMRS group 1, and each DMRS group adopts the same Precoding weights or beamforming weights, using the same or different precoding weights or beamforming weights between DMRS groups;
  • the open-loop DMRS is carried on the ⁇ 0, 4, 6, 10 ⁇ subcarriers of the ⁇ 5, 6 ⁇ OFDM symbol of the even slot and the ⁇ 5, 5 ⁇ OFDM symbol of the odd slot ⁇ 1, 5 , 7,11 ⁇ subcarriers
  • the ⁇ 0,1,4,5 ⁇ , ⁇ 6,7,10,11 ⁇ subcarriers carry 2 DMRS groups, and the subcarriers ⁇ 0,1,4,5 ⁇ carry DMRS group 0, subcarrier ⁇ 6 , 7, 10, 11 ⁇ bears the DMRS group 1, each of the DMRS groups adopt the same precoding weight or beamforming weight, and the same or different precoding weights or beamforming weights are used between the DMRS groups.
  • CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the OFDM in the even time slot ⁇ 5, 6 ⁇ OFDM. Multiplexing of two ports on adjacent two pilot resource elements of the same subcarrier and odd-numbered slots ⁇ 5, 6 ⁇ multiplexing of two ports on two adjacent pilot resource elements of OFDM symbol, walsh code Use [1,1], [1,-1];
  • the walsh code is used to perform the even time slots ⁇ 5, 6 ⁇ and the odd time slots ⁇ 5, 6 ⁇
  • the CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the OFDM in the even time slot ⁇ 5, 6 ⁇ OFDM.
  • the multiplexing of two ports on the adjacent two pilot resource elements of the same subcarrier and the multiplexing of the two ports on the two pilot resource elements of the odd time slot ⁇ 5, 6 ⁇ the walsh code adopts [1, 1], [1,-1];
  • the walsh code is used to perform the same sub-slots ⁇ 5, 6 ⁇ and odd-numbered slots ⁇ 5, 6 ⁇ .
  • the four pilot resource elements of the carrier are multiplexed by more than two ports, and the wa l s h code is [1, 1, 1, 1],
  • the CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the OFDM in the even time slot ⁇ 5, 6 ⁇ OFDM.
  • the multiplexing of two ports on the adjacent two pilot resource elements of the same subcarrier and the multiplexing of the two ports on the two pilot resource elements of the odd time slot ⁇ 5, 6 ⁇ the walsh code adopts [1, 1], [1,-1];
  • the walsh code is used to perform the subcarriers ⁇ 0, 1, 4, 5 ⁇ or ⁇ 6, 7, 10, 11 ⁇ on the even-numbered slots ⁇ 5, 6 ⁇ and the odd-numbered slots ⁇ 5, 6 ⁇ OFDM symbols.
  • the multiplexing of more than two ports on the four pilot resource elements, the walsh code uses [1,1,1,1], [1,1,-1,-1], [1,-1,1,-1 ] , [1,-1,-1,
  • the OFDM symbol carrying the open-loop DMRS is the ⁇ 3, 6 ⁇ OFDM symbol of the even slot and the ⁇ 2, 5 ⁇ OFDM symbol of the odd slot.
  • the first mode, the open-loop DMRS is carried on the ⁇ 0, 1, 4, 5, 6, 7, 10, 11 ⁇ subcarriers of the ⁇ 3, 6 ⁇ OFDM symbol of the OFDM even slot, and the ⁇ 2, 5 ⁇ the ⁇ 0, 1, 4, 5, 6, 7, 10, 11 ⁇ subcarriers of the OFDM symbol; wherein the subcarriers on the even time slot OFDM ⁇ 3, 6 ⁇ are ⁇ 0, 1, 4, 5 ⁇ carrying a DMRS group, the subcarriers ⁇ 6, 7, 10, 11 ⁇ on the even slot OFDM ⁇ 3, 6 ⁇ carrying one DMRS group, and the subcarriers on the odd slot OFDM ⁇ 2, 5 ⁇ ⁇ 0, 1, 4, 5 ⁇ carries a DMRS group, and the subcarriers ⁇ 6, 7, 10, 11 ⁇ on the odd-slot OFDM ⁇ 2, 5 ⁇ carry one DMRS group, which carries 4 DMRS groups, and each DMRS group
  • the same precoding weight or beamforming weight is used, and the same or different precoding weights
  • the open-loop DMRS is carried on the ⁇ 0, 1, 3, 4, 6, 7, 9, 10 ⁇ subcarriers of the OFDM even time slot ⁇ 3 ⁇ and the odd time slot ⁇ 2 ⁇ OFDM symbol.
  • ⁇ 1, 2, 4, 5, 7, 8, 10, 11 ⁇ subcarriers of the ⁇ 5 ⁇ and even slot ⁇ 5 ⁇ OFDM symbols of the even slot where the even slot OFDM ⁇ 3 ⁇
  • the subcarriers ⁇ 0, 1, 3, 4 ⁇ and the subcarriers ⁇ 1, 2, 4, 5 ⁇ on OFDM ⁇ 6 ⁇ carry 1 DMRS group
  • the subcarriers on the even slot OFDM ⁇ 3 ⁇ ⁇ 6, 7,9,10 ⁇ and subcarriers ⁇ 7,8,10,11 ⁇ on OFDM ⁇ 6 ⁇ carry 1 DMRS group, subcarriers ⁇ 0,1,3,4 ⁇ on odd slot OFDM ⁇ 2 ⁇
  • subcarriers ⁇ 1, 2, 4, 5 ⁇ on OFDM ⁇ 5 ⁇ carry 1 DMRS group, subcarriers ⁇ 6, 7,
  • mode 3 open-loop DMRS is carried in the OFDM even time slot ⁇ 3, 6 ⁇ and odd
  • the subcarriers on the even-slot OFDM ⁇ 3 ⁇ and OFDM ⁇ 6 ⁇ 0, 1 ⁇ carries 1 DMRS group
  • sub-carriers OFDM ⁇ 3 ⁇ on even-numbered slots and ⁇ 3,4 ⁇ on OFDM ⁇ 6 ⁇ carry 1 DMRS group
  • even-slot OFDM ⁇ 3 ⁇ and OFDM ⁇ 6 ⁇ The subcarriers ⁇ 7, 8 ⁇ carry 1 DMRS group
  • the even slots OFDM ⁇ 3 ⁇ and the subcarriers ⁇ 10, 11 ⁇ on OFDM ⁇ 6 ⁇ carry 1 DMRS group
  • the subcarrier ⁇ 0, 1 ⁇ on ⁇ 5 ⁇ carries 1 DMRS group
  • the open-loop DMRS is carried on the ⁇ 0, 1, 3, 4, 6, 7, 9, 10 ⁇ subcarriers of the OFDM even time slot ⁇ 3 ⁇ and the odd time slot ⁇ 2 ⁇ OFDM symbol.
  • ⁇ 6 ⁇ of the even time slot and the ⁇ 1, 2, 4, 5, 7, 8, 10, 11 ⁇ subcarriers of the ⁇ 5 ⁇ OFDM symbol of the odd time slot wherein the even time slot OFDM ⁇ 3 ⁇
  • Subcarriers ⁇ 0, 1 ⁇ on the subcarrier ⁇ 0, 1 ⁇ and OFDM ⁇ 6 ⁇ carry 1 DMRS group, subcarriers ⁇ 3, 4 ⁇ on OFDM ⁇ 3 ⁇ and children on OFDM ⁇ 6 ⁇ Carrier ⁇ 4, 5 ⁇ carries 1 DMRS group, subcarrier ⁇ 6, 7 ⁇ on OFDM ⁇ 3 ⁇ and subcarrier ⁇ 7, 8 ⁇ on OFDM ⁇ 6 ⁇ carries 1 DMRS group, on OFDM ⁇ 3 ⁇ Subcarriers ⁇ 9, 10 ⁇ and subcarriers ⁇ 10, 11
  • Each DMRS group uses the same precoding weight or beamforming weight, DMRS. Between the same or different, or precoding weights beamforming weights.
  • CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the even time slot ⁇ 3.
  • the walsh code is [1,1], [1, -1];
  • the walsh code is used to perform the same DMRS group and the same on the even time slot ⁇ 3, 6 ⁇ and the odd time slot ⁇ 2, 5 ⁇ OFDM symbols.
  • the multiplexer is greater than two ports on the four pilot resource elements on the OFDM symbol ⁇ 0, 1, 4, 5 ⁇ or ⁇ 6, 7, 10, 11 ⁇ , and the walsh code is [1, 1 ,1,1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1];
  • CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the even time slots ⁇ 3, 6 ⁇ or the multiplexing of two ports on two pilot resource elements of the adjacent DMRS group adjacent subcarriers on the OFDM symbol ⁇ 2, 5 ⁇ OFDM symbols, the walsh code is [1, 1],
  • the walsh code is used to perform the same DMRS group and the same OFDM symbol on the even-numbered slot ⁇ 3, 6 ⁇ and the odd-numbered slot ⁇ 2, 5 ⁇ OFDM symbols.
  • the walsh code uses [1,1,1,1], [1,1,-1,-1], [1,-1,1,-1], [1,- 1,-1,1];
  • CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the even time slots ⁇ 3, 6 ⁇ or the multiplexing of two ports on two pilot resource elements of the adjacent DMRS group adjacent subcarriers on the OFDM symbol ⁇ 2, 5 ⁇ OFDM symbols, the walsh code is [1, 1],
  • the walsh code is used to perform the same DMRS on the even-numbered slots ⁇ 3, 6 ⁇ and the odd-numbered slots ⁇ 2, 5 ⁇ OFDM symbols. Group and four pilot resources on the same carrier OFDM symbol ⁇ 0, 1, 3, 4 ⁇ or ⁇ 7, 8, 10, 11 ⁇
  • the multiplex of more than two ports on the element, the walsh code uses [1,1,1,1], [1,1,-1,-1], [1,-1,1,-1], [1, -1,-1,1];
  • CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the even time slots ⁇ 3, 6 ⁇ or the multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 2, 5 ⁇ OFDM symbol, the walsh code adopts [U], [1,-1] .
  • the OFDM symbol carrying the open-loop DMRS is the ⁇ 4 ⁇ OFDM symbol of the even slot and the ⁇ 0, 1, 4 ⁇ OFDM symbol of the odd slot.
  • the fifth mode, the open-loop DMRS is carried on the ⁇ 0, 1, 4, 5, 6, 7, 10, 11 ⁇ subcarriers of the ⁇ 4 ⁇ OFDM symbol of the OFDM even slot and the ⁇ 0 ⁇ of the odd slot , 1, 4 ⁇ on the ⁇ 0, 1, 4, 5, 6, 7, 10, 11 ⁇ subcarriers of the OFDM symbol, where the even slot OFDM ⁇ 4 ⁇ and the odd slot on the ⁇ 0 ⁇ OFDM symbol Subcarriers ⁇ 0, 1, 4, 5 ⁇ carry 1 DMRS group, even slot OFDM ⁇ 4 ⁇ and subcarrier ⁇ 6, 7, 10, 11 ⁇ on the ⁇ 0 ⁇ OFDM symbol of odd slot 1 DMRS group, the subcarriers ⁇ 0, 1, 4, 5 ⁇ on the odd-slot OFDM ⁇ 1,4 ⁇ carry 1 DMRS group, and the sub-carriers on the odd-slot OFDM ⁇ 1,4 ⁇ ⁇ bears 1 DMRS group, and carries 4 DMRS groups in total.
  • the open-loop DMRS is carried on the ⁇ 0, 1, 3, 4, 6, 7, 9, 10 ⁇ subcarriers of the ⁇ 1 ⁇ OFDM even time slot and the ⁇ 1 ⁇ 0 FDM symbol of the odd time slot.
  • the ⁇ 1, 2, 4, 5, 7, 8, 10, 11 ⁇ subcarriers of the ⁇ 0 ⁇ and odd time slot ⁇ 4 ⁇ OFDM symbols of which the even time slot OFDM ⁇ 4 ⁇
  • the subcarriers ⁇ 0, 1, 3, 4 ⁇ on the subcarriers and the subcarriers ⁇ 1, 2, 4, 5 ⁇ on the odd slot OFDM ⁇ 0 ⁇ carry 1 DMRS group, and the subcarriers on the OFDM ⁇ 4 ⁇
  • the subcarriers ⁇ 7, 8, 10, 11 ⁇ on the carrier ⁇ 6, 7, 9, 10 ⁇ and the odd slot OFDM ⁇ 0 ⁇ carry one DMRS group, and the subcarriers on the odd slot 0FDM ⁇ 1 ⁇ ⁇ 0 , 1, 3, 4 ⁇ and subcarriers ⁇ 1, 2, 4, 5 ⁇ on
  • mode 7 the open-loop DMRS is carried in the ⁇ 0, 1, 4, 5, 6, 7, 10, 11 of the OFDM even time slot ⁇ 4 ⁇ and the odd time slot ⁇ 0, 1, 4 ⁇ OFDM symbol
  • the even-slot OFDM ⁇ 4 ⁇ and the sub-carrier ⁇ 0,1 ⁇ on the odd-slot OFDM ⁇ 0 ⁇ carry one DMRS group
  • the even-slot OFDM ⁇ 4 ⁇ and the odd-slot OFDM ⁇ 0 The subcarrier ⁇ 4,5 ⁇ on the ⁇ carries 1 DMRS group
  • the even-slot OFDM ⁇ 4 ⁇ and the sub-carriers ⁇ 6,7 ⁇ on the odd-slot OFDM ⁇ 0 ⁇ carry 1 DMRS group
  • even-slot OFDM Subcarrier ⁇ 10,11 ⁇ on ⁇ 4 ⁇ and odd slot OFDM ⁇ 0 ⁇ carries 1 DMRS group
  • subcarrier ⁇ 0,1 ⁇ on odd slot OFDM ⁇ 1 ⁇ and OFDM ⁇ 4 ⁇ carries 1 DMRS group
  • the open-loop DMRS is carried in the ⁇ 0, 1, 3, 4, 7, 8, 10, 11 of the OFDM even time slot ⁇ 4 ⁇ and the odd time slot ⁇ 0, 1, 4 ⁇ OFDM symbol
  • the even-slot OFDM ⁇ 4 ⁇ and the sub-carrier ⁇ 0,1 ⁇ on the odd-slot OFDM ⁇ 0 ⁇ carry one DMRS group
  • Subcarrier ⁇ 3, 4 ⁇ on ⁇ carries 1 DMRS group
  • subcarriers ⁇ 7, 8 ⁇ on even slot OFDM ⁇ 4 ⁇ and odd slot OFDM ⁇ 0 ⁇ carries 1 DMRS group
  • even slot OFDM Subcarrier ⁇ 10,11 ⁇ on ⁇ 4 ⁇ and odd slot OFDM ⁇ 0 ⁇ carries 1 DMRS group
  • subcarrier ⁇ 0,1 ⁇ on odd slot OFDM ⁇ 1 ⁇ and OFDM ⁇ 4 ⁇ carries 1 DMRS group
  • the open-loop DMRS is carried on the ⁇ 0, 1, 3, 4, 6, 7, 9, 10 ⁇ subcarriers of the OFDM even time slot ⁇ 4 ⁇ and the odd time slot ⁇ 1 ⁇ 0 FDM symbol And on the ⁇ 1, 2, 4, 5, 7, 8, 10, 11 ⁇ subcarriers of the ⁇ 0 ⁇ and odd time slot ⁇ 4 ⁇ OFDM symbols, of which the even time slot OFDM ⁇ 4 ⁇ Subcarrier ⁇ 1, 2 ⁇ on upper ⁇ 0, 1 ⁇ and odd slot OFDM ⁇ 0 ⁇ carries 1 DMRS group, subcarrier ⁇ 3, 4 ⁇ on even slot OFDM ⁇ 4 ⁇ and odd slot OFDM Subcarrier ⁇ 4, 5 ⁇ on ⁇ 0 ⁇ carries 1 DMRS group, subcarrier ⁇ 6, 7 ⁇ on even slot OFDM ⁇ 4 ⁇ and subcarrier on odd slot OFDM ⁇ 0 ⁇ ⁇ 7, 8 ⁇ carrying 1 DMRS group, subcarrier ⁇ 9, 10 ⁇ on even time slot OFDM ⁇ 4 ⁇ and subcarrier ⁇ 10, 11 ⁇ on odd
  • the tenth, open-loop DMRS is carried in the ⁇ 1, 2, 4, 5, 7, 8, 10, 11 of the OFDM even time slot ⁇ 4 ⁇ and the odd time slot ⁇ 0, 1, 4 ⁇ OFDM symbol
  • the subcarrier ⁇ 1, 2 ⁇ on the even slot OFDM ⁇ 4 ⁇ and the odd slot OFDM ⁇ 0 ⁇ carries 1 DMRS group
  • Subcarrier ⁇ 4,5 ⁇ on ⁇ carries 1 DMRS group
  • subcarriers ⁇ 7,8 ⁇ on even slot OFDM ⁇ 4 ⁇ and odd slot OFDM ⁇ 0 ⁇ carries 1 DMRS group
  • even slot OFDM Subcarrier ⁇ 10,11 ⁇ on ⁇ 4 ⁇ and odd-slot OFDM ⁇ 0 ⁇ carries 1 In the DMRS group
  • the subcarriers ⁇ 1, 2 ⁇ on the odd-slot OFDM ⁇ 1 ⁇ and OFDM ⁇ 4 ⁇ carry one DMRS group
  • CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the even time slot ⁇ 4. ⁇ or the multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbols, the walsh code is [1, 1], [1 , -1];
  • the walsh code is used to perform the same DMRS group on the even-numbered slot ⁇ 4 ⁇ and the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbols.
  • the subcarriers ⁇ 0, 1, 4, 5 ⁇ on the OFDM symbol or the four pilot resource elements on ⁇ 6, 7, 10, 11 ⁇ are multiplexed by more than two ports, and the walsh code is [1, 1, 1,1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1];
  • CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the even time slot ⁇ 4 ⁇ or The multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbol, the walsh code is [1,1], [1,- 1];
  • the walsh code is used to perform the same DMRS group and OFDM symbol on the even-numbered slot ⁇ 4 ⁇ and the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbols.
  • the walsh code uses [1,1,1,1], [1,1,-1,-1], [1,-1,1,-1], [1, -1,-1,1];
  • CDM is used to reuse different DMRS port
  • the walsh code is used to perform the adjacent DMRS group adjacent to the even-numbered slot ⁇ 4 ⁇ or the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbol.
  • the multiplexing of two ports on the two pilot resource elements of the subcarrier, the walsh code uses [1,1], [1,-1]; when each DMRS contains more than two DMRS ports, then the walsh code is used.
  • the four pilot resource elements on 11 ⁇ are multiplexed by more than two ports, and the walsh code is [1,1,1,1], [1,1,-1,-1], [1,-1 ,1,-1] , [1,-1,-1,1];
  • CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the even time slot ⁇ 4 ⁇ or The multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbol, the walsh code is [1,1], [1,- 1];
  • the walsh code is used to perform the same DMRS group and OFDM symbol on the even-numbered slot ⁇ 4 ⁇ and the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbols.
  • the subcarriers ⁇ 0, 1, 3, 4 ⁇ or the four pilot resource elements on ⁇ 7, 8, 10, 11 ⁇ are multiplexed on more than two ports, and the walsh code is [1, 1, 1, 1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1];
  • the CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the even time slot ⁇ 4 ⁇ or The multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbol, the walsh code adopts [U], [1,-1] ;
  • CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the even time slot ⁇ 4 ⁇ or The same one on the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbol Multiplexing of two ports on two pilot resource elements of adjacent subcarriers of the DMRS group, the walsh code adopts [1,1], [1,-1]; when each DMRS contains more than two DMRS ports, this The walsh code is used to perform the same DMRS group on the even-numbered slot ⁇ 4 ⁇ and the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbols and the subcarriers ⁇ 1, 2, 4, 5 ⁇ or ⁇ 7 on the OFDM symbol. Multiple pilot resources on the four pilot resource elements on 8,8,11 ⁇ are multiplexed with two ports.
  • the walsh code uses [1,1,1,1], [1,1,-1,-1], [ 1,-1,1,-1] , [1,-1,-U].
  • the open-loop DMRS is carried in the ⁇ 1, 2, 4, 5, 7, 8, 10, 11 ⁇ subcarriers of the OFDM even time slot ⁇ 4 ⁇ and the odd time slot ⁇ 0, 1, 4 ⁇ OFDM symbols.
  • the subcarriers ⁇ 1, 2, 4, 5 ⁇ on the even slot OFDM ⁇ 4 ⁇ and the odd slot OFDM ⁇ 0 ⁇ carry one DMRS group, the even slot OFDM ⁇ 4 ⁇ and the odd slot OFDM ⁇
  • the subcarriers ⁇ 7, 8, 10, 11 ⁇ on 0 ⁇ carry one DMRS group, and the subcarriers ⁇ 1, 2, 4, 5 ⁇ on the odd slot 0FDM ⁇ 1, 4 ⁇ carry one DMRS group, 0FDM
  • the subcarriers ⁇ 7, 8, 10, 11 ⁇ on ⁇ 1, 4 ⁇ carry one DMRS group, which carries 4 DMRS groups, and each DMRS group uses the same precoding weight or beamforming weight, DMRS The same or different precoding weights or beamforming weights are used between groups.
  • CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the even time slot ⁇ 4 ⁇ or odd number. Multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent to the OFDM symbol on the ⁇ 0, 1, 4 ⁇ OFDM symbol, the walsh code is [1, 1], [1, -1]
  • the walsh code is used to perform the same DMRS group and OFDM symbols on the even-numbered slot ⁇ 4 ⁇ and the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbols.
  • the walsh code is [1,1,1,1] , [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-U].
  • the open-loop DMRS is carried in the ⁇ 1, 2, 4, 5, 7, 8, 10, 11 ⁇ subcarriers of the OFDM even time slot ⁇ 3, 6 ⁇ and the odd time slot ⁇ 2, 5 ⁇ OFDM symbol Upper, where even time slot OFDM ⁇ 3,6 ⁇
  • carries one DMRS group, and the subcarriers ⁇ 7, 8, 10, 11 ⁇ on OFDM ⁇ 3, 6 ⁇ carry one DMRS group, odd slot OFDM ⁇ 2
  • the subcarriers ⁇ 1, 2, 4, 5 ⁇ on 5 ⁇ carry one DMRS group, and the subcarriers ⁇ 7, 8, 10, 11 ⁇ on OFDM ⁇ 2, 5 ⁇ carry one DMRS group, and bear a total of 4
  • the same precoding weight or beamforming weight is used in each DMRS group, and the same or different precoding weights or beamforming weights are used between the DMRS groups;
  • the open-loop DMRS is carried on the ⁇ 1, 2, 4, 5, 7, 8, 10, 11 ⁇ subcarriers of the ⁇ 2, 5 ⁇ OFDM even time slot and the ⁇ 2, 5 ⁇ OFDM symbol of the odd time slot.
  • the subcarriers ⁇ 1, 2 ⁇ on the even-numbered slots OFDM ⁇ 3 ⁇ and OFDM ⁇ 6 ⁇ carry 1 DMRS group, the even-slot OFDM ⁇ 3 ⁇ and the subcarriers on OFDM ⁇ 6 ⁇ ⁇ 4,5 ⁇ carrying 1 DMRS group, subcarriers ⁇ 7, 8 ⁇ on even-slot OFDM ⁇ 3 ⁇ and OFDM ⁇ 6 ⁇ carrying 1 DMRS group, sub-carriers on even-slot OFDM ⁇ 3 ⁇ and OFDM ⁇ 6 ⁇ ⁇ 10,11 ⁇ carries 1 DMRS group, subcarriers ⁇ 1, 2 ⁇ on odd-slot OFDM ⁇ 2 ⁇ and OFDM ⁇ 5 ⁇ carry 1 DMRS group, odd-slot OFDM ⁇ 2 ⁇ and OFDM ⁇ 5 ⁇
  • CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the even time slots ⁇ 3, 6 ⁇ or The multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 2, 5 ⁇ OFDM symbol, the walsh code adopts [1, 1],
  • the walsh code is used to perform the same one on the even-numbered slots ⁇ 3, 6 ⁇ and the odd-numbered slots ⁇ 2, 5 ⁇ OFDM symbols.
  • CDM is used to multiplex different DMRS ports.
  • the walsh code is used to perform the even time slots ⁇ 3, 6 ⁇ or The multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 2, 5 ⁇ OFDM symbol, the walsh code is [1, 1], [1, -1] .
  • the walsh code is used to perform the same DMRS group and the OFDM symbol on the even-numbered slot ⁇ 3, 6 ⁇ and the odd-numbered slot ⁇ 2, 5 ⁇ OFDM symbols.
  • the four pilot resource elements on the carrier ⁇ 1,2,4,5 ⁇ or ⁇ 7,8,10,11 ⁇ are multiplexed by more than two ports, and the walsh code is [1,1,1,1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-U].
  • a reference signal processing system for an open-loop MIMO system comprising an open-loop DMRS multiplexing unit and a weighting processing unit;
  • the open-loop DMRS multiplexing unit is configured to use the CDM and/or TDM and/or FDM technologies in an ordinary subframe, the third, fourth, fifth, and sixth OFDM symbols in an even subframe in one subframe, and the odd number Multiple sets of open-loop DMRSs are multiplexed on one or more of the 0, 1, 2, 4, 5, and 6 OFDM symbols of the slot;
  • the weighting processing unit is configured to perform the same weighting process by using the same or different weights for different groups of open-loop DMRSs.
  • the OFDM symbol carrying the open-loop DMRS is the ⁇ 5, 6 ⁇ OFDM symbol of the even slot and the ⁇ 5, 6 ⁇ OFDM symbol of the odd slot; or
  • the OFDM symbol carrying the open-loop DMRS is the ⁇ 3, 6 ⁇ OFDM symbol of the even slot and the ⁇ 2, 5 ⁇ OFDM symbol of the odd slot; or
  • the OFDM symbol carrying the open-loop DMRS is the ⁇ 0 ⁇ , OFDM symbol of the even-numbered slot and the ⁇ 0, 1, 4 ⁇ OFDM symbol of the odd-numbered slot.
  • the reference signal processing method of the open-loop MIMO system proposed by the present invention is implemented by DMRS
  • the current open-loop MIMO transmission thereby reducing the extra resource overhead of the common reference signal pilot band, for example, based on DMRS for open-loop pilot design, the network-side precoding weight or beamforming weight can be free of code
  • the limitation of the present invention greatly improves the accuracy of the precoding weight or the beamforming weight, and can improve the performance of the UE in the open loop mode without increasing the complexity, test complexity and resource consumption of the UE. . DRAWINGS
  • 1 is a schematic diagram of 12 DMRS group mapping patterns of a time domain spread spectrum normal cyclic prefix (Normal CP) according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a mapping pattern of four DMRS groups of a time- or spread spectrum Normal CP according to an embodiment of the present invention
  • 3 to FIG. 5 are schematic diagrams showing mappings of two DMRS groups of time domain spread spectrum Normal CP according to an embodiment of the present invention
  • 6 , 7 , 10 , 11 , 16 , and 18 are schematic diagrams of mapping patterns of four frequency DMRS groups of frequency domain spread CPs according to an embodiment of the present invention
  • 8 , 9 , 12 , 13 , 14 , 15 , 17 are schematic diagrams of a mapping pattern of 8 frequency DMRS groups of frequency domain spread CPs according to an embodiment of the present invention
  • FIG. 19 is a schematic diagram of a reference signal processing flow of an open-loop MIMO system according to an embodiment of the present invention
  • FIG. 20 is a diagram of a reference signal processing system of an open-loop MIMO system according to an embodiment of the present invention.
  • DETAILED DESCRIPTION In practical applications, when designing a reference signal for an open-loop MIMO system under Normal CP, CDM (Code Division Multiplexing) and/or TDM (Time Division Multiplexing) and/or may be utilized in a normal subframe.
  • the weight includes a precoding weight and/or a beamforming weight
  • the weighting process includes: performing corresponding precoding and/or using the precoding weight and/or beamforming weight. Beamforming processing.
  • -open loop DMRS may be the ⁇ 5, 6 ⁇ OFDM symbol of the even slot and the ⁇ 5, 6 ⁇ OFDM symbol of the odd slot.
  • the open-loop DMRS may be carried on the 0th to 11th subcarriers of the ⁇ 5, 6 ⁇ OFDM symbol of the OFDM even slot and the ⁇ 5, 6 ⁇ OFDM symbol of the odd slot, where the 0th to 11th subcarriers
  • Different DMRS groups are respectively carried in each group, and the same precoding weight or beamforming weight is used in each DMRS group, and the same or different precoding weights or beamforming weights are used between the DMRS groups.
  • the walsh code may be used for the even time slots ⁇ 5, 6 ⁇ Multiplexing of two ports on adjacent two pilot resource elements of the same subcarrier on the OFDM symbol and two adjacent pilot resource elements of the same subcarrier on the ⁇ 5, 6 ⁇ OFDM symbol on the OFDM symbol
  • the walsh code can be [1,1], [1,-1].
  • the walsh code can be used to perform four of the same subcarriers on the even time slot ⁇ 5, 6 ⁇ OFDM symbol and the odd time slot ⁇ 5, 6 ⁇ OFDM symbol.
  • the multiplexing of the pilot resource elements is greater than two ports.
  • the walsh code can be [1,1,1,1], [1,1,-1,-1], [1,-1,1,-1] , [1,-1,-1,1].
  • CDM multiplexing with an OCC (orthogonal mask) length equal to 2 may be employed.
  • OCC length may be equal to 4
  • different DMRS ports may be multiplexed by CDM+FDM; for DMRS port ⁇ 0, 1 ⁇ , OCC length may be equal to
  • the CDM mode of 2 is multiplexed in the odd DMRS port group; for the DMRS port ⁇ 2, 3 ⁇ , the even DMRS port group can be multiplexed by the CDM with the OCC length equal to 2.
  • the DMRS port ⁇ 0, 1, 4, 6 ⁇ It is multiplexed in the odd DMRS port group by the CDM with the OCC length equal to 4; for the DMRS port ⁇ 2, 3, 5, 7 ⁇ , it can be multiplexed in the even DMRS port group by the CDM with the OCC length equal to 4.
  • the open-loop DMRS may be carried in the ⁇ 5, 6 ⁇ OFDM symbol of the OFDM even slot and the ⁇ 0, 1, 4, 5, 6, 7, 10 of the ⁇ 5, 6 ⁇ OFDM symbol of the odd slot.
  • 11 ⁇ subcarriers where ⁇ 0, 4 ⁇ , ⁇ 1, 5 ⁇ , ⁇ 6, 10 ⁇ , ⁇ 7, 11 ⁇ subcarriers carry 4 DMRS groups, and subcarrier ⁇ 0, 4 ⁇ carries DMRS Group 0, subcarrier ⁇ 1,5 ⁇ carries DMRS group 1, subcarrier ⁇ 6,10 ⁇ carries DMRS group 2, subcarrier ⁇ 7, 11 ⁇ carries DMRS group 3, and the same precoding right is used in each DMRS group Value or beamforming weight, the same or different precoding weights or beamforming weights are used between DMRS groups.
  • each DMRS group different DMRS ports may be multiplexed by using CDM.
  • the walsh code may be used to perform the even time slot ⁇ 5, 6 ⁇ multiplexing of two ports on adjacent two pilot resource elements of the same subcarrier on the OFDM symbol and complexing of two ports on adjacent two pilot resource elements on the ⁇ 5, 6 ⁇ OFDM symbol
  • [1,1], [1,-1] can be used.
  • the walsh code may be used to perform greater than four pilot resource elements of the same subcarrier located in the even time slot ⁇ 5, 6 ⁇ and the odd time slot ⁇ 5, 6 ⁇ .
  • the walsh code can be [1,1,1,1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1 , -1, 1].
  • CDM multiplexing with an OCC length equal to 2 may be employed.
  • CDM multiplexing with OCC length equal to 4 may be used, or different DMRS ports may be multiplexed by CDM+FDM; for DMRS port ⁇ 0, 1 ⁇ , OCC length may be equal to
  • the CDM mode of 2 is multiplexed in the odd DMRS port group; for the DMRS port ⁇ 2, 3 ⁇ , it can be multiplexed in the even DMRS port group by the CDM with the OCC length equal to 2.
  • DMRS ports ⁇ 0, 1, 4, 6 ⁇ it can be multiplexed in odd DMRS port groups by CDM with OCC length equal to 4; for DMRS Ports ⁇ 2, 3, 5, 7 ⁇ can be multiplexed in even DMRS port groups by CDM with OCC length equal to 4.
  • the open-loop DMRS may be carried on the ⁇ 0, 5, 6, 11 ⁇ subcarriers of the ⁇ 5, 6 ⁇ OFDM symbol of the OFDM even slot and the ⁇ 5, 6 ⁇ OFDM symbol of the odd slot, where
  • the ⁇ 0, 5 ⁇ , ⁇ 6, 11 ⁇ subcarriers carry 2 DMRS groups, the subcarrier ⁇ 0, 5 ⁇ carries DMRS group 0, and the subcarrier ⁇ 6, 11 ⁇ carries DMRS group 1, each DMRS group
  • the same precoding weight or beamforming weight is used, and the same or different precoding weights or beamforming weights are used between the DMRS groups.
  • each DMRS group different DMRS ports may be multiplexed by using CDM.
  • the walsh code may be used to perform the even time slot ⁇ 5, 6 ⁇ multiplexing of two ports on adjacent two pilot resource elements of the same subcarrier on the OFDM symbol and complexing of two ports on adjacent two pilot resource elements on the ⁇ 5, 6 ⁇ OFDM symbol
  • [1,1], [1,-1] can be used.
  • the walsh code may be used to perform greater than four pilot resource elements of the same subcarrier located in the even time slot ⁇ 5, 6 ⁇ and the odd time slot ⁇ 5, 6 ⁇ .
  • the walsh code can be [1,1,1,1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1 , -1, 1].
  • the open-loop DMRS may be carried on the ⁇ 1, 5, 7, 11 ⁇ subcarriers of the ⁇ 5, 6 ⁇ OFDM symbol of the OFDM even slot and the ⁇ 5, 6 ⁇ OFDM symbol of the odd slot, where
  • the ⁇ 1, 5 ⁇ , ⁇ 7, 11 ⁇ subcarriers carry a total of 2 DMRS groups, the subcarrier ⁇ 1, 5 ⁇ carries DMRS group 0, and the subcarrier ⁇ 7, 11 ⁇ carries DMRS group 1, each DMRS group
  • the same precoding weight or beamforming weight is used, and the same or different precoding weights or beamforming weights are used between the DMRS groups.
  • the walsh code may be used to perform the even time slot ⁇ 5, 6 ⁇ adjacent two pilots of the same subcarrier on the OFDM symbol
  • the multiplexing of two ports on the source element and the multiplexing of two ports on the two pilot resource elements on the ⁇ 5, 6 ⁇ OFDM symbol in the odd slot, the walsh code can be [1, 1], [1, -1 ].
  • the walsh code may be used to perform greater than four pilot resource elements of the same subcarrier located in the even time slot ⁇ 5, 6 ⁇ and the odd time slot ⁇ 5, 6 ⁇ .
  • the walsh code can be [1,1,1,1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1 , -1, 1].
  • the open-loop DMRS may be carried on the ⁇ 0, 4, 6, 10 ⁇ subcarriers of the ⁇ 5, 6 ⁇ OFDM symbol of the OFDM even slot and the ⁇ 5, 6 ⁇ OFDM symbol of the odd slot ⁇ 1, 5, 7, 11 ⁇ subcarriers, where ⁇ 0, 1, 4, 5 ⁇ , ⁇ 6, 7, 10, 11 ⁇ subcarriers carry 2 DMRS groups, subcarriers ⁇ 0, 1, 4 5 ⁇ carries the DMRS group 0, and the subcarriers ⁇ 6, 7, 10, 11 ⁇ carry the DMRS group 1, and each DMRS group uses the same precoding weight or beamforming weight, and the DMRS groups use the same or different Precoding weight or beamforming weight.
  • the walsh code may be used to perform the even time slot ⁇ 5, 6 ⁇ multiplexing of two ports on adjacent two pilot resource elements of the same subcarrier on the OFDM symbol and two adjacent pilot resource elements on the same subcarrier on the ⁇ 5, 6 ⁇ OFDM symbol on the OFDM symbol
  • the walsh code can be [1,1], [1,-1].
  • the walsh code can be used to perform subcarriers ⁇ 0, 1, 4 on the even-numbered slots ⁇ 5, 6 ⁇ and odd-numbered slots ⁇ 5, 6 ⁇ OFDM symbols.
  • walsh code can use [1,1,1,1], [1,1,-1, -1] , [1,-1,1,-1] , [1,-1,-1,1].
  • -open loop DMRS may be the ⁇ 3, 6 ⁇ OFDM symbol of the even slot and the ⁇ 2, 5 ⁇ OFDM symbol of the odd slot.
  • the open-loop DMRS may be carried on the ⁇ 0, 1, 4, 5, 6, 7, 10, 11 ⁇ subcarriers of the ⁇ 3, 6 ⁇ OFDM symbol of the OFDM even slot and the ⁇ 2 of the odd slot 5 ⁇
  • the subcarriers ⁇ 0, 1, 4, 5 ⁇ on the even time slot OFDM ⁇ 3, 6 ⁇ Carrying a DMRS group, the subcarriers ⁇ 6, 7, 10, 11 ⁇ on the even slot OFDM ⁇ 3, 6 ⁇ carry one DMRS group, and the subcarriers on the odd slot OFDM ⁇ 2, 5 ⁇ ⁇ 0, 1 , 4, 5 ⁇ carries a DMRS group, and the subcarriers ⁇ 6, 7, 10, 11 ⁇ on the odd-slot OFDM ⁇ 2, 5 ⁇ carry one DMRS group, which carries 4 DMRS groups, and each DMRS group adopts For the same precoding weight or beamforming weight, the same or different precoding weights or beamforming weights are used between the DMRS groups.
  • each DMRS group different DMRS ports may be multiplexed by using CDM.
  • the walsh code may be used for the even time slot ⁇ 3, The walsh code can be multiplexed with two ports on the two pilot resource elements of the same DMRS group adjacent to the OFDM symbol on the ⁇ 2, 5 ⁇ OFDM symbol. [1,1], [1, -1].
  • the walsh code can be used to perform the same DMRS group and the same OFDM symbol on the even-numbered slot ⁇ 3, 6 ⁇ and the odd-numbered slot ⁇ 2, 5 ⁇ OFDM symbols.
  • Multiple subcarriers ⁇ 0,1,4,5 ⁇ or four pilot resource elements on ⁇ 6,7,10,11 ⁇ are multiplexed on more than two ports, and the walsh code can be [1,1,1 ,1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1].
  • the open-loop DMRS may be carried on the ⁇ 0, 1, 3, 4, 6, 7, 9, 10 ⁇ subcarriers of the OFDM even time slot ⁇ 3 ⁇ and the odd time slot ⁇ 2 ⁇ OFDM symbol.
  • ⁇ 1, 2, 4, 5, 7, 8, 10, 11 ⁇ subcarriers of the ⁇ 6 ⁇ and even slot ⁇ 5 ⁇ OFDM symbols of the even slot where the even slot OFDM ⁇ 3 ⁇
  • the subcarriers ⁇ 0, 1, 3, 4 ⁇ and the subcarriers ⁇ 1, 2, 4, 5 ⁇ on OFDM ⁇ 6 ⁇ carry one DMRS group, and the subcarriers on the even slot OFDM ⁇ 3 ⁇ ⁇ 6, 7,
  • Subcarriers ⁇ 7, 8, 10, 11 ⁇ on 9, 10 ⁇ and OFDM ⁇ 6 ⁇ carry one DMRS group, subcarriers ⁇ 0, 1, 3, 4 ⁇ and OFDM ⁇ on odd-numbered slot OFDM ⁇ 2 ⁇
  • the subcarrier ⁇ 1, 2, 4, 5 ⁇ on 5 ⁇ carries one DMRS group, the subcarriers
  • Each DMRS group uses the same precoding weight or beamforming weight.
  • the same or different precoding weights are used between the DMRS groups. Or beamforming weights.
  • different DMRS ports may be multiplexed by using CDM.
  • the walsh code may be used for the even time slot ⁇ 3, The walsh code can be multiplexed with two ports on the two pilot resource elements of the same DMRS group adjacent to the OFDM symbol on the ⁇ 2, 5 ⁇ OFDM symbol. [1,1], [1, -1].
  • the walsh code can be used to perform the same DMRS group and the same OFDM symbol on the even-numbered slot ⁇ 3, 6 ⁇ and the odd-numbered slot ⁇ 2, 5 ⁇ OFDM symbols.
  • the walsh code can be [1,1,1,1], [1,1,-1,-1] , [1,-1,1,-1] , [1 , -1, -1, 1].
  • the open-loop DMRS may be carried in the ⁇ 0, 6 ⁇ of the OFDM even time slot and the ⁇ 0, 1, 3, 4, 7, 8, 10, 11 ⁇ of the ⁇ 2, 5 ⁇ OFDM symbol of the odd time slot.
  • the subcarriers ⁇ 0, 1 ⁇ on the even time slots OFDM ⁇ 3 ⁇ and OFDM ⁇ 6 ⁇ carry one DMRS group
  • the subcarriers on the even time slots OFDM ⁇ 3 ⁇ and OFDM ⁇ 6 ⁇ ⁇ 3, 4 ⁇ carrying a DMRS group
  • subcarriers ⁇ 7, 8 ⁇ on even-slot OFDM ⁇ 3 ⁇ and OFDM ⁇ 6 ⁇ carrying one DMRS group
  • sub-carriers on even-slot OFDM ⁇ 3 ⁇ and OFDM ⁇ 6 ⁇ ⁇ 10 11 ⁇ carries a DMRS group
  • the subcarriers ⁇ 0, 1 ⁇ on the odd-slot OFDM ⁇ 2 ⁇ and OFDM ⁇ 5 ⁇ carry one DMRS group
  • each DMRS group different DMRS ports may be multiplexed by using CDM.
  • the walsh code may be used for the even time slot ⁇ 3, 6 ⁇ or odd-numbered slot ⁇ 2, 5 ⁇ OFDM symbol on the two pilot resources of the same DMRS group adjacent to the two pilot resources on the multiplexer, walsh code can Use [1,1], [1,-1].
  • the walsh code can be used to perform the same DMRS group and the same OFDM symbol on the even-numbered slot ⁇ 3, 6 ⁇ and the odd-numbered slot ⁇ 2, 5 ⁇ OFDM symbols.
  • Multiple subcarriers ⁇ 0,1,3,4 ⁇ or four pilot resource elements on ⁇ 7,8,10,11 ⁇ are multiplexed on more than two ports, and the walsh code can be [1,1,1 ,1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1].
  • the open-loop DMRS may be carried on the ⁇ 0, 1, 3, 4, 6, 7, 9, 10 ⁇ subcarriers of the OFDM even time slot ⁇ 3 ⁇ and the odd time slot ⁇ 2 ⁇ OFDM symbol.
  • the even slot OFDM ⁇ 3 ⁇ Subcarriers ⁇ 0, 1 ⁇ and subcarriers ⁇ 1, 2 ⁇ on OFDM ⁇ 6 ⁇ carry one DMRS group, subcarriers on even-numbered slots OFDM ⁇ 3 ⁇ ⁇ 3, 4 ⁇ and OFDM ⁇ 6 ⁇
  • the subcarrier ⁇ 4,5 ⁇ carries one DMRS group
  • the subcarriers ⁇ 6,7 ⁇ on the even slot OFDM ⁇ 3 ⁇ and the subcarriers ⁇ 7,8 ⁇ on the OFDM ⁇ 6 ⁇ carry one DMRS group, even time slots
  • Subcarriers ⁇ 9, 10 ⁇ on OFDM ⁇ 3 ⁇ and subcarriers On the ⁇ 1, 2, 4, 5, 7, 8, 10, 11 ⁇ subcarriers of the ⁇ 6 ⁇ and even slot ⁇ 5 ⁇ OFDM symbols
  • the walsh code may be used for the even time slot ⁇ 3, 6 ⁇ or the multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 2, 5 ⁇ OFDM symbol, the walsh code can be [1, 1], [1 ,-1].
  • the OFDM symbol carrying the open-loop DMRS may be the ⁇ 4 ⁇ OFDM of the even-numbered slot The symbol and the ⁇ 0, 1, 4 ⁇ OFDM symbol of the odd slot.
  • the open-loop DMRS may be carried on the ⁇ 0, 1, 4, 5, 6, 7, 10, 11 ⁇ subcarriers of the ⁇ 4 ⁇ OFDM symbol of the OFDM even slot and the ⁇ 0 of the odd slot 1, 5 ⁇ on the ⁇ 0, 1, 4, 5, 6, 7, 10, 11 ⁇ subcarriers of the OFDM symbol, where the subcarriers in the even slot OFDM ⁇ 4 ⁇ and the odd slot OFDM ⁇ 0 ⁇ ⁇ 0,1,4,5 ⁇ carries one DMRS group, and the subcarriers ⁇ 6,7,10,11 ⁇ on the even slot OFDM ⁇ 4 ⁇ and the odd slot OFDM ⁇ 0 ⁇ carry one DMRS group, odd slot OFDM
  • the subcarriers ⁇ 0, 1, 4, 5 ⁇ on ⁇ 1, 4 ⁇ carry one DMRS group, and the subcarriers ⁇ 6, 7, 10, 11 ⁇ on the odd slot 0FDM ⁇ 1, 4 ⁇ carry a DMRS group.
  • a total of four DMRS groups are carried, and the same precoding weight or beamforming weight is
  • each DMRS group different DMRS ports may be multiplexed by using CDM.
  • the walsh code may be used for the even time slot ⁇ 4 ⁇ . Or multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbol, the walsh code can be [1, 1], [1 ,-1].
  • the walsh code can be used to perform the same DMRS group and OFDM symbols on the even-numbered slot ⁇ 4 ⁇ and the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbols.
  • the subcarriers ⁇ 0, 1, 4, 5 ⁇ or the four pilot resource elements on ⁇ 6, 7, 10, 11 ⁇ are multiplexed by more than two ports, and the walsh code can be [1, 1, 1, 1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1].
  • the open loop DMRS can be carried in the OFDM even time slot ⁇ 4 ⁇ and the odd time slot
  • each DMRS group different DMRS ports may be multiplexed by using CDM.
  • the walsh code may be used for the even time slot ⁇ 4 ⁇ . Or multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbol, the walsh code can be [1, 1], [1 ,-1].
  • a walsh code may be used to perform the same DMRS group and OFDM symbols on the even-numbered slot ⁇ 4 ⁇ and the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbols.
  • the walsh code can be [1,1,1,1], [1,1,-1,-1] , [1,-1,1,-1] , [1,- 1,-1,1].
  • the open-loop DMRS may be carried in the ⁇ 0, 1, 4, 5, 6, 7, 10, 11 ⁇ of the ⁇ 0, 1, 4 ⁇ OFDM symbol of the OFDM even slot ⁇ 4 ⁇ and the odd slot.
  • the subcarrier ⁇ 0, 1 ⁇ on the even slot OFDM ⁇ 4 ⁇ and the odd slot OFDM ⁇ 0 ⁇ carries one DMRS group
  • the subcarrier ⁇ 4,5 ⁇ carries one DMRS group
  • the even slot OFDM ⁇ 4 ⁇ and the subcarrier ⁇ 6,7 ⁇ on the odd slot OFDM ⁇ 0 ⁇ carry one DMRS group
  • each DMRS group different DMRS ports may be multiplexed by using CDM.
  • the walsh code may be used for the even time slot ⁇ 4 ⁇ . Or multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbol, the walsh code can be [1, 1], [1 ,-1].
  • a walsh code may be used to perform the same DMRS group and OFDM symbols on the even-numbered slot ⁇ 4 ⁇ and the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbols.
  • the walsh code can be [1,1,1,1 ], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1].
  • the open-loop DMRS may be carried in the ⁇ 0, 1, 3, 4, 7, 8, 10, 11 ⁇ of the ⁇ 0, 1, 4 ⁇ OFDM symbol of the OFDM even slot ⁇ 4 ⁇ and the odd slot.
  • the subcarrier ⁇ 0, 1 ⁇ on the even slot OFDM ⁇ 4 ⁇ and the odd slot OFDM ⁇ 0 ⁇ carries one DMRS group
  • the subcarrier ⁇ 3, 4 ⁇ carries one DMRS group
  • the even slot OFDM ⁇ 4 ⁇ and the subcarrier ⁇ 7, 8 ⁇ on the odd slot OFDM ⁇ 0 ⁇ carry one DMRS group
  • each DMRS group different DMRS ports may be multiplexed by using CDM.
  • the walsh code may be used for the even time slot ⁇ 4 ⁇ . Or the same one on the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbols
  • the walsh code can be [1, 1], [1, -1].
  • a walsh code may be used to perform the same DMRS group and OFDM symbols on the even-numbered slot ⁇ 4 ⁇ and the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbols.
  • the walsh code can be [1,1,1,1 ], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1].
  • the open-loop DMRS may be carried on the ⁇ 0, 1, 3, 4, 6, 7, 9, 10 ⁇ subcarriers of the OFDM even time slot ⁇ 4 ⁇ and the odd time slot ⁇ 1 ⁇ OFDM symbols.
  • the even slot OFDM ⁇ 4 ⁇ Subcarriers ⁇ 1, 2 ⁇ on ⁇ 0, 1 ⁇ and odd slot OFDM ⁇ 0 ⁇ carry one DMRS group, subcarriers ⁇ 3, 4 ⁇ on even slot OFDM ⁇ 4 ⁇ and odd slot OFDM ⁇ 0
  • the subcarrier ⁇ 4, 5 ⁇ on ⁇ carries one DMRS group, the subcarrier ⁇ 6, 7 ⁇ on the even slot OFDM ⁇ 4 ⁇ and the subcarrier ⁇ 7, 8 ⁇ on the odd slot OFDM ⁇ 0 ⁇ carry one DMRS group, subcarrier ⁇ 9, 10 ⁇ on even slot OFDM ⁇ 4 ⁇ and subcarrier
  • each DMRS group different DMRS ports may be multiplexed by using CDM.
  • the walsh code may be used for the even time slot ⁇ 4 ⁇ . Or multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbols, the walsh code can Use [1,1], [1,-1].
  • the open-loop DMRS may be carried in the ⁇ 1, 2, 4, 5, 7, 8, 10, 11 ⁇ of the ⁇ 0, 1, 4 ⁇ OFDM symbol of the OFDM even time slot ⁇ 4 ⁇ and the odd time slot.
  • the subcarrier ⁇ 1, 2 ⁇ on the even slot OFDM ⁇ 4 ⁇ and the odd slot OFDM ⁇ 0 ⁇ carries one DMRS group
  • the subcarrier ⁇ 4,5 ⁇ carries one DMRS group
  • the even slot OFDM ⁇ 4 ⁇ and the subcarrier ⁇ 7,8 ⁇ on the odd slot OFDM ⁇ 0 ⁇ carry one DMRS group
  • carrying one DMRS group, the odd-numbered slots 0FDM ⁇ 1 ⁇ and the sub-carriers ⁇ 1,2 ⁇ on the OFDM ⁇ 4 ⁇ carry one DMRS group, odd time slots
  • each DMRS group different DMRS ports may be multiplexed by using CDM.
  • the walsh code may be used for the even time slot ⁇ 4 ⁇ . Or multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbol, the walsh code can be [1, 1], [1 ,-1].
  • a walsh code may be used to perform the same DMRS group and OFDM symbols on the even-numbered slot ⁇ 4 ⁇ and the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbols.
  • Multiple subcarriers on the four pilot resource elements on subcarrier ⁇ 1,2,4,5 ⁇ or ⁇ 7,8,10,11 ⁇ , walsh code can be [1,1,1,1 ], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1].
  • the open-loop DMRS may be carried in the ⁇ 1, 2, 4, 5, 7, 8, 10, 11 ⁇ of the ⁇ 0, 1, 4 ⁇ OFDM symbol of the OFDM even time slot ⁇ 4 ⁇ and the odd time slot.
  • the subcarriers ⁇ 1, 2, 4, 5 ⁇ on the even slot OFDM ⁇ 4 ⁇ and the odd slot OFDM ⁇ 0 ⁇ carry a DMRS group
  • Subcarriers ⁇ 7, 8, 10, 11 ⁇ on even-slot OFDM ⁇ 4 ⁇ and odd-slot OFDM ⁇ 0 ⁇ carry one DMRS group
  • subcarriers on odd-numbered slots 0FDM ⁇ 1,4 ⁇ ⁇ 1,2 4, 5 ⁇ carries a DMRS group
  • the subcarriers ⁇ 7, 8, 10, 11 ⁇ on the OFDM ⁇ 1, 4 ⁇ carry one DMRS group, which carries 4 DMRS groups, and the same preamble is used in each DMRS group.
  • Encoding weights or beamforming weights, the same or different precoding weights or beamforming weights are
  • each DMRS group different DMRS ports may be multiplexed by using CDM.
  • the walsh code may be used for the even time slot ⁇ 4 ⁇ . Or multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbol, the walsh code can be [1, 1], [1 ,-1].
  • the walsh code can be used to perform the same DMRS group and the same OFDM on the even-numbered slot ⁇ 4 ⁇ and the odd-numbered slot ⁇ 0, 1, 4 ⁇ OFDM symbols.
  • the subcarriers on the symbol ⁇ 1,2,4,5 ⁇ or the four pilot resource elements on ⁇ 7,8,10,11 ⁇ are multiplexed on more than two ports, and the wa l s h code can be used [1] ,1,1,1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1].
  • the open-loop DMRS may be carried in the ⁇ 1, 6 ⁇ of the OFDM even time slot and the ⁇ 1, 2, 4, 5, 7, 8, 10, 11 ⁇ of the ⁇ 2, 5 ⁇ OFDM symbol of the odd time slot.
  • the subcarriers ⁇ 1, 2, 4, 5 ⁇ on the even slot OFDM ⁇ 3, 6 ⁇ carry one DMRS group
  • the subcarriers on the OFDM ⁇ 3, 6 ⁇ ⁇ 7, 8, 10, 11 ⁇ carrying a DMRS group subcarriers ⁇ 1 , 2, 4, 5 ⁇ on odd-numbered slot OFDM ⁇ 2, 5 ⁇ carrying one DMRS group
  • subcarriers on OFDM ⁇ 2, 5 ⁇ ⁇ 7, 8, 10, 1 lf carries a DMRS group, which carries 4 DMRS groups.
  • Each DMRS group uses the same precoding weight or beamforming weight. The same or different precoding weights or beamforming weights are used between the DMRS groups.
  • each DMRS group different DMRS ports may be multiplexed by using CDM.
  • the walsh code may be used for the even time slot ⁇ 3, 6 ⁇ or the multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 2, 5 ⁇ OFDM symbol, the walsh code can Use [1,1], [1,-1].
  • the walsh code can be used to perform the same DMRS group and the same one on the even-numbered slot ⁇ 3, 6 ⁇ and the odd-numbered slot ⁇ 2, 5 ⁇ OFDM symbols.
  • the subcarriers on the OFDM symbol ⁇ 1,2,4,5 ⁇ or the four pilot resource elements on ⁇ 7,8,10,11 ⁇ are multiplexed on more than two ports, and the walsh code can be [1, 1,1,1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1].
  • the open-loop DMRS may be carried in the ⁇ 1, 6 ⁇ of the OFDM even time slot and the ⁇ 1, 2, 4, 5, 7, 8, 10, 11 ⁇ of the ⁇ 2, 5 ⁇ OFDM symbol of the odd time slot.
  • the subcarriers ⁇ 1, 2 ⁇ on the even-numbered slots OFDM ⁇ 3 ⁇ and OFDM ⁇ 6 ⁇ carry one DMRS group
  • the sub-carriers on the even-slot OFDM ⁇ 3 ⁇ and OFDM ⁇ 6 ⁇ are ⁇ 4, 5 ⁇ carrying a DMRS group
  • subcarriers ⁇ 7, 8 ⁇ on even-slot OFDM ⁇ 3 ⁇ and OFDM ⁇ 6 ⁇ carrying one DMRS group
  • sub-carriers on even-slot OFDM ⁇ 3 ⁇ and OFDM ⁇ 6 ⁇ ⁇ group carries a DMRS 10,11 ⁇
  • the OFDM sub-carriers ⁇ 5 ⁇ on the ⁇ 1, 2 ⁇ DMRS carries a group
  • each DMRS group different DMRS ports may be multiplexed by using CDM.
  • the walsh code may be used for the even time slot ⁇ 3, 6 ⁇ or the multiplexing of two ports on two pilot resource elements of the same DMRS group adjacent subcarriers on the odd-numbered slot ⁇ 2, 5 ⁇ OFDM symbol, the walsh code can be [1, 1], [1 ,-1].
  • the walsh code can be used to perform the same DMRS group and the same one on the even-numbered slot ⁇ 3, 6 ⁇ and the odd-numbered slot ⁇ 2, 5 ⁇ OFDM symbols.
  • the tilsh code can use [1,1] on the four pilot resource elements on the subcarrier ⁇ 1,2,4,5 ⁇ or ⁇ 7,8,10,11 ⁇ on the OFDM symbol. ,1,1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1].
  • OFDM indices are numbered according to subframes, that is, one subframe contains two slots, and the even-numbered slots and odd-slot OFDM indices are uniformly numbered #0 to #13.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • Figure 1 shows a set of pilot patterns for an open-loop DMRS in a sub-frame, including 12 DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 5, 6, 12, 13 ⁇ OFDM symbol.
  • DMRS group 0 to group 11 occupy RE (resource element) positions of ( ⁇ to 11, yO to 11), where x represents the subcarrier sequence index within one RB, and y represents the index of the OFDM symbol.
  • DMRS ports can be multiplexed by TDM and/or CDM.
  • the walsh code can be used for ⁇ 5, 6 ⁇ . Multiplexing of two ports on two adjacent pilot resource elements of the same subcarrier on an OFDM symbol and multiplexing of two ports on two adjacent pilot resource elements of the same subcarrier on a ⁇ 12, 13 ⁇ OFDM symbol
  • the walsh code can be [1,1], [1,-1].
  • a walsh code may be used to perform four pilot resource elements on the ⁇ 5, 6 ⁇ OFDM symbol and the same subcarrier on the ⁇ 12, 13 ⁇ OFDM symbol.
  • the walsh code can be [1,1,1,1], [1,1,-1,-1], [1,-1,1,-1], [1,- 1,-U].
  • a system using the above pilot pattern can support transmission of open loop MIMO of 1 to 8 layers, and for the case of two layers, CDM multiplexing with an OCC length equal to 2 can be used.
  • CDM multiplexing with OCC length equal to 4 may be used, or different DMRS ports may be multiplexed by CDM+FDM; for DMRS port ⁇ 0, 1 ⁇ , OCC length may be equal to 2 CDM modes are multiplexed in even DMRS groups; for DMRS ports ⁇ 2, 3 ⁇ , The odd DMRS group can be multiplexed in a CDM manner with an OCC length equal to two.
  • DMRS ports ⁇ 0, 1, 4, 6 ⁇ it can be multiplexed in even DMRS port groups by CDM with OCC length equal to 4; for DMRS ports ⁇ 2, 3, 5, 7 ⁇ It can be multiplexed in odd DMRS groups by CDM with OCC length equal to 4.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • Figure 2 shows a set of pilot patterns for an open-loop DMRS in one subframe, including four DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 5, 6, 12, 13 ⁇ OFDM symbol. It is assumed that the RE positions occupied by DMRS groups 0 to 3 are ( ⁇ to 3, y0 to 3), where x represents the subcarrier number within one RB, and y represents the index of the OFDM symbol.
  • walsh code [1,1], [1,-1] can be used.
  • the walsh code may be used to perform greater than four pilot resource elements on the ⁇ 5, 6 ⁇ OFDM symbol and the same subcarrier on the ⁇ 12, 13 ⁇ OFDM symbol.
  • the walsh code can be [1,1,1,1], [1,1,-1,-1], [1,-1,1,-1], [1,-1 , -1, 1].
  • a system using the above pilot pattern can support transmission of open loop MIMO of 1 to 8 layers, and for the case of two layers, CDM multiplexing with an OCC length equal to 2 can be used.
  • CDM multiplexing with OCC length equal to 4 may be used, or different DMRS ports may be multiplexed by CDM+FDM; for DMRS port ⁇ 0, 1 ⁇ , OCC length may be equal to 2 CDM modes are multiplexed in even DMRS groups; for DMRS ports ⁇ 2, 3 ⁇ , The odd DMRS group can be multiplexed in a CDM manner with an OCC length equal to two.
  • DMRS ports ⁇ 0, 1, 4, 6 ⁇ it can be multiplexed in even DMRS port groups by CDM with OCC length equal to 4; for DMRS ports ⁇ 2, 3, 5, 7 ⁇ It can be multiplexed in odd DMRS port groups by CDM with OCC length equal to 4.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • Figure 3 shows a set of pilot patterns for an open-loop DMRS in a sub-frame, including two DMRS groups.
  • the walsh code can be used for ⁇ 5, 6 ⁇ OFDM. Multiplexing of two ports on adjacent two pilot resource elements of the same subcarrier on the symbol and multiplexing of two ports on adjacent two pilot resource elements of the same subcarrier on the ⁇ 12, 13 ⁇ OFDM symbol, The walsh code can be [1,1], [1,-1]. When each DMRS contains more than two DMRS ports, the walsh code can be used to perform greater than four pilot resource elements on the ⁇ 5, 6 ⁇ OFDM symbol and the same subcarrier on the ⁇ 12, 13 ⁇ OFDM symbol. For multiplexing of two ports, the walsh code can be [1,1,1,1], [1,1,-1,-1], [1,-1,1,-1], [1,-1 , -U].
  • a system using the above pilot pattern can support transmission of open loop MIMO of 1 to 8 layers, and for the case of two layers, CDM multiplexing with an OCC length equal to 2 can be used.
  • CDM multiplexing with OCC length equal to 4 may be used, or different DMRS ports may be multiplexed by CDM+FDM; for DMRS port ⁇ 0, 1 ⁇ , OCC length may be equal to 2 CDM modes are multiplexed in even DMRS groups; for DMRS ports ⁇ 2, 3 ⁇ , The odd DMRS group can be multiplexed in a CDM manner with an OCC length equal to two.
  • the DMRS port ⁇ 0, 1, 4, 6 ⁇ it can be multiplexed in the even DMRS group by CDM with the OCC length equal to 4; for the DMRS port ⁇ 2, 3, 5, 7 ⁇ , It can be multiplexed in odd DMRS groups by CDM with OCC length equal to 4.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • Figure 4 shows a pattern of a set of pilots in an open-loop DMRS in one subframe, including two DMRS groups.
  • the walsh code can be used for ⁇ 5, 6 ⁇ OFDM. Multiplexing of two ports on two pilot resource elements of the same subcarrier on the symbol and multiplexing of two ports on two pilot resource elements of the same subcarrier on the ⁇ 12, 13 ⁇ OFDM symbol, the walsh code can be used [1,1], [1,-1]. When each DMRS contains more than two DMRS ports, the walsh code may be used to perform greater than four pilot resource elements on the ⁇ 5, 6 ⁇ OFDM symbol and the same subcarrier on the ⁇ 12, 13 ⁇ OFDM symbol. For multiplexing of two ports, the walsh code can be [1,1,1,1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1 , -1, 1].
  • a system using the above pilot pattern can support transmission of open loop MIMO of 1 to 8 layers, and for the case of two layers, CDM multiplexing with an OCC length equal to 2 can be used.
  • CDM multiplexing with OCC length equal to 4 may be used, or different DMRS ports may be multiplexed by CDM+FDM; for DMRS port ⁇ 0, 1 ⁇ , OCC length may be equal to
  • the CDM mode of 2 is multiplexed in the even DMRS group; for the DMRS port ⁇ 2, 3 ⁇ , it can be multiplexed in the odd DMRS group by the CDM with the OCC length equal to 2.
  • DMRS ports ⁇ 0, 1, 4, 6 ⁇ it can be multiplexed in even DMRS groups by CDM with OCC length equal to 4; for DMRS ports ⁇ 2, 3, 5, 7 ⁇ , A mode in which the OCC length is equal to 4 is multiplexed in an odd DMRS group.
  • Embodiment 5 is a diagrammatic representation of Embodiment 5:
  • Figure 5 shows a pattern of a set of pilots in an open-loop DMRS in one subframe, including two DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 5, 6, 12, 13 ⁇ OFDM symbol. It is assumed that the RE positions occupied by DMRS group 0 to group 1 are respectively ( ⁇ to 1, y0 to 1), where x represents an index of a relative subcarrier number OFDM symbol within one RB, and y represents an index of an OFDM symbol.
  • the Walsh code can be used to perform multiplexing and ⁇ 12, 13 ⁇ OFDM on two pilot resource elements of the same subcarrier on the ⁇ 5, 6 ⁇ OFDM symbol.
  • the walsh code can be [1, 1], [1, -1].
  • the walsh code can be used to perform subcarrier (0, 4) subcarriers on the ⁇ 5, 6 ⁇ OFDM symbol and sub-carriers on the ⁇ 12, 13 ⁇ OFDM symbol.
  • the four pilot resource elements of the subcarriers (7, 11) on the OFDM symbol are multiplexed by more than two ports, and the walsh code can be [1, 1, 1, 1], [1, 1, -1, -1], [1,-1,1,-1], [1,-1,-1,1].
  • Figure 6 shows a pattern of a set of pilots in an open-loop DMRS in one subframe, including four DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 3, 6, 9, 12 ⁇ OFDM symbol.
  • Set DMRS group 0 The RE positions occupied by the group 3 are respectively ( ⁇ to 3, yO to 3), where x represents an index of a relative subcarrier number OFDM symbol within one RB, and y represents an index of an OFDM symbol.
  • the walsh code can be [1,1], [1,-1].
  • the walsh code can be used to perform the same OFDM symbol (0, 1, 4, 5) or (6, 7, located on the OFDM symbol ⁇ 3, 6 ⁇ .
  • the subcarrier or OFDM symbol ⁇ 9, 12 ⁇ on the same OFDM symbol (0, 1, 4, 5) or (6, 7, 10, 11) subcarriers are greater than four pilot resource elements
  • the walsh code can be [1,1,1,1], [1,1,-1,-1], [1,-1,1,-1], [1,-1 , -1, 1].
  • Figure 7 shows a set of pilot patterns for an open-loop DMRS in a sub-frame, including four DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 3, 6, 9, 12 ⁇ OFDM symbol. It is assumed that the RE positions occupied by DMRS groups 0 to 3 are ( ⁇ to 3, y0 to 3), respectively, where x represents an index of a relative subcarrier number OFDM symbol within one RB, and y represents an index of an OFDM symbol.
  • the walsh code can be [1, 1], [1,-1].
  • a walsh code may be used to perform subcarriers (0, 1, 3, 4) on the same OFDM symbol of OFDM symbols ⁇ 3 ⁇ and ⁇ 9 ⁇ , (6, 7, 9, 10), and four subcarriers (1, 2, 4, 5), (7, 8, 10, 11) on the same OFDM symbol of ⁇ 6 ⁇ and ⁇ 12 ⁇
  • the walsh code can be [1,1,1,1], [1,1,-1,-1], [1,-1,1,-1 ], [1,-1,-1,1].
  • Figure 8 shows a set of pilot patterns for an open-loop DMRS in a sub-frame, including eight DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 3, 6, 9, 12 ⁇ OFDM symbol. It is assumed that the RE positions occupied by DMRS groups 0 to 7 are respectively ( ⁇ to 7, y0 to 7), where x represents an index of a relative subcarrier number OFDM symbol within one RB, and y represents an index of an OFDM symbol.
  • Figure 9 shows a set of pilot patterns for an open-loop DMRS in a sub-frame, including eight DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 3, 6, 9, 12 ⁇ OFDM symbol. It is assumed that the RE positions occupied by DMRS groups 0 to 7 are respectively ( ⁇ to 7, y0 to 7), where x represents an index of a relative subcarrier number OFDM symbol within one RB, and y represents an index of an OFDM symbol.
  • a walsh code may be used to perform two ports on two pilot resource elements of adjacent subcarriers located on the same OFDM symbol of the OFDM symbol ⁇ 3, 6 ⁇ .
  • Multiplexing and multiplexing of two ports on two pilot resource elements of adjacent subcarriers on the same symbol of OFDM symbol ⁇ 9, 12 ⁇ , walsh code can be [1, 1], [1, -1] .
  • Figure 10 shows a pattern of a set of pilots in an open-loop DMRS in one subframe, including four DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 4, 7, 8, ll ⁇ OFDM symbol. It is assumed that the RE positions occupied by DMRS group 0 to group 3 are respectively ( ⁇ to 3, y0 to 3), where x represents an index of a relative subcarrier number OFDM symbol within one RB, and y represents an index of an OFDM symbol.
  • FDM and/or CDM can be used to recover with different DMRS ports, when each DMRS group contains two DMRS ports, the walsh code can be used to perform two pilot resources of adjacent subcarriers on the same OFDM symbol of the OFDM symbol ⁇ 4, 7 ⁇ .
  • the walsh code can be [1, 1], [1,-1].
  • a walsh code may be used to perform subcarriers (0, 1, 4, 5) on the same OFDM symbol of OFDM symbols 4, 7, 8, and 11. (6, 7, 10, 11)
  • the multiplexing of more than two ports on the four pilot resource elements, the walsh code can be [1,1,1,1], [1,1,-1,-1] , [1,-1,1,-1], [1,-1,-1,1].
  • Figure 11 shows a pattern of a set of pilots in an open-loop DMRS in one subframe, including four DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 4, 7, 8, 11 ⁇ 0FDM symbol. It is assumed that the RE positions occupied by DMRS group 0 to group 3 are respectively ( ⁇ to 3, y0 to 3), where x represents an index of a relative subcarrier number OFDM symbol within one RB, and y represents an index of an OFDM symbol.
  • the walsh code can be used to perform the same OFDM symbol ⁇ 4, 7 ⁇ . Multiplexing of two ports on two pilot resource elements of adjacent subcarriers on an OFDM symbol and two pilot resource elements on two pilot resources of adjacent subcarriers on the same symbol of OFDM symbol ⁇ 8, 11 ⁇
  • the walsh code can be [1,1], [1,-1].
  • a walsh code may be used to perform subcarriers (0, 1, 3, 4) on the same OFDM symbol of OFDM symbols 4, 7, 8, and 11.
  • the wa l s h code can be [1,1,1,1], [1,1,-1,-1], [1,-1 , 1, -1], [1, -1, -1, 1].
  • Figure 12 shows a set of pilot patterns for an open-loop DMRS in a sub-frame, including eight DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 4, 7, 8, 11 ⁇ 0FDM symbol. It is assumed that the RE positions occupied by DMRS groups 0 to 7 are respectively ( ⁇ to 7, y0 to 7), where x represents an index of a relative subcarrier number OFDM symbol within one RB, and y represents an index of an OFDM symbol.
  • a walsh code may be used to perform subcarriers (0, 1, 4, 5) on the same OFDM symbol of OFDM symbols 4, 7, 8, and 11. (6, 7, 10, 11)
  • the multiplexing of more than two ports on the four pilot resource elements, the walsh code can be [1,1,1,1], [1,1,-1,-1] , [1,-1,1,-1], [1,-1,-1,1].
  • Figure 13 shows a set of pilot patterns for an open-loop DMRS in a sub-frame, including eight DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 4, 7, 8, ll ⁇ OFDM symbol.
  • Set DMRS group 0 The RE positions occupied by the group 7 are respectively ( ⁇ to 7, yO to 7), where x represents an index of a relative subcarrier number OFDM symbol within one RB, and y represents an index of an OFDM symbol.
  • a walsh code may be used to perform subcarriers (0, 1, 3, 4) on the same OFDM symbol of OFDM symbols 4, 7, 8, and 11. (7, 8, 10, 11)
  • the multiplexing of more than two ports on the four pilot resource elements, the wa l s h code can be [1,1,1,1], [1,1,-1, -1], [1,-1,1,-1], [1,-1,-1,1].
  • Embodiment 14 is a diagrammatic representation of Embodiment 14:
  • Figure 14 shows a set of pilot patterns for an open-loop DMRS in a sub-frame, including eight DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 4, 7, 8, ll ⁇ OFDM symbol. It is assumed that the RE positions occupied by DMRS groups 0 to 7 are respectively ( ⁇ to 7, y0 to 7), where x represents an index of a relative subcarrier number OFDM symbol within one RB, and y represents an index of an OFDM symbol.
  • a walsh code can be used to perform two pilots of adjacent subcarriers on the same OFDM symbol of OFDM symbol ⁇ 4, 7 ⁇ . Multiplexing of two ports on a resource element and multiplexing of two ports on two pilot resource elements of adjacent subcarriers on the same symbol of OFDM symbol ⁇ 8, 11 ⁇ , walsh code can be [1, 1] , [1,-1].
  • a walsh code may be used to perform subcarriers (0, 1, 3, 4) on the same OFDM symbol of OFDM symbols 4, 7, 8, and 11.
  • the walsh codes can be used on the four pilot resource elements of (1, 2, 4, 5), (6, 7, 9, 10), (7, 8, 10, 11). 1,1,1,1], [1,1,-1,-1], [1,-1,1,-1],
  • Figure 15 shows a set of pilot patterns for an open-loop DMRS in a sub-frame, including eight DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 4, 7, 8, ll ⁇ OFDM symbol. It is assumed that the RE positions occupied by DMRS groups 0 to 7 are respectively ( ⁇ to 7, y0 to 7), where x represents an index of a relative subcarrier number OFDM symbol within one RB, and y represents an index of an OFDM symbol.
  • a walsh code may be used to perform subcarriers (1, 2, 4, 5) on the same OFDM symbol of OFDM symbols 4, 7, 8, and 11. (7, 8, 10, 11)
  • the multiplexing of more than two ports on the four pilot resource elements, the wa l s h code can be [1,1,1,1], [1,1,-1, -1], [1,-1,1,-1], [1,-1,-1,1].
  • Figure 16 shows a pattern of a set of pilots in an open-loop DMRS in one subframe, including four DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 4, 7, 8, 11 ⁇ 0FDM symbol. It is assumed that the RE positions occupied by DMRS groups 0 to 3 are ( ⁇ to 3, y0 to 3), where x represents the index of the relative subcarrier number OFDM symbol within one RB, and y represents the index of the OFDM symbol.
  • CDM can be used to multiplex different DMRS ports.
  • the walsh code can be used to locate Multiplexing of two ports on two pilot resource elements of adjacent subcarriers on the same OFDM symbol ⁇ 4, 7 ⁇ and two adjacent subcarriers on the same symbol of OFDM symbol ⁇ 8, 11 ⁇
  • the multiplexing of two ports on the pilot resource elements, the walsh code can use [1,1], [1,-1].
  • a walsh code may be used to perform subcarriers (1, 2, 4, 5) on the same OFDM symbol of OFDM symbols 4, 7, 8, and 11. (7, 8, 10, 11)
  • the multiplexing of more than two ports on the four pilot resource elements, the walsh code can use [1,1,1,1], [1,1,-1,-1] , [1,-1,1,-1], [1,-1,-1,1].
  • Figure 17 shows a set of pilot patterns for an open-loop DMRS in a sub-frame, including 8 DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 3, 6, 9, 12 ⁇ OFDM symbol. It is assumed that the RE positions occupied by DMRS groups 0 to 7 are respectively ( ⁇ to 7, yO to 7), where x represents an index of a relative subcarrier number OFDM symbol within one RB, and y represents an index of an OFDM symbol.
  • a walsh code may be used to perform subcarriers (1, 2, 4, 5) located on the same OFDM symbol of OFDM symbols 3, 6, 9, and 12. (7, 8, 10, 11)
  • the multiplexing of more than two ports on the four pilot resource elements, the wa l s h code can be [1,1,1,1], [1,1,-1, -1], [1,-1,1,-1], [1,-1,-1,1].
  • Figure 18 shows a pattern of a set of pilots in an open-loop DMRS in one subframe, including four DMRS groups.
  • the open loop DMRS can be mapped to the ⁇ 3, 6, 9, 12 ⁇ OFDM symbol. It is assumed that the RE positions occupied by DMRS group 0 to group 3 are respectively ( ⁇ to 3, y0 to 3), where x represents an index of a relative subcarrier number OFDM symbol within one RB, and y represents an index of an OFDM symbol.
  • the walsh code can be used to locate Multiplexing of two ports on two pilot resource elements of adjacent subcarriers on the same OFDM symbol of OFDM symbol ⁇ 3, 6 ⁇ and two adjacent subcarriers on the same symbol of OFDM symbol ⁇ 9, 12 ⁇
  • the multiplexing of two ports on the pilot resource elements, the walsh code can use [1,1], [1,-1].
  • a walsh code may be used to perform subcarriers (1, 2, 4, 5) on the same OFDM symbol of OFDM symbols 3, 6, 9, and 12. (7, 8, 10, 11)
  • the multiplexing of more than two ports on the four pilot resource elements, the walsh code can be [1,1,1,1], [1,1,-1,-1] , [1,-1,1,-1] , [1,-1,-1,1].
  • the operation of the present invention for processing a reference signal of an open-loop MIMO system can represent the flow shown in FIG. 19, and the process includes the following steps:
  • Step 1901 In a normal subframe, using CDM and/or TDM and/or FDM technology, even-numbered slots 3, 4, 5, and 6 OFDM symbols in one subframe, odd-numbered slots 0, 1, and 2 Multiple sets of open-loop DMRSOs are multiplexed on one or more of the 4, 5, and 6 OFDM symbols
  • Step 1902 The same or different weights are used for different groups of open-loop DMRSs, and corresponding weighting processing is performed.
  • the weight includes a precoding weight and/or a beamforming weight
  • the weighting process includes: performing corresponding precoding and/or using the precoding weight and/or beamforming weight. Beamforming processing.
  • FIG. 20 is a diagram of a reference signal processing system of an open-loop MIMO system according to an embodiment of the present invention, where the system includes a connected open-loop DMRS multiplexing unit and a weighting processing unit.
  • the open-loop DMRS multiplexing unit can use the CDM and/or TDM and/or FDM techniques to transmit the 3rd, 4th, 5th, and 6th OFDM symbols in even subframes in a normal subframe.
  • One or more of the 0, 1, 2, 4, 5, and 6 OFDM symbols of the odd slot Different sets of open-loop DMRSs are multiplexed on the symbol.
  • the weighting processing unit can then use the same or different weights for different sets of open-loop DMRSs and perform corresponding weighting processing.
  • the reference signal processing method of the open-loop MIMO system proposed by the present invention is based on DMRS for open-loop pilot design, network-side precoding weight or beamforming weight.
  • the accuracy of the precoding weight or the beamforming weight can be greatly improved without being limited by the codebook, and the UE can be opened as much as possible without increasing the complexity and test complexity and resource consumption of the UE. Performance under mode.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un système pour le traitement d'un signal de référence dans un système MIMO en boucle ouverte. Dans un cadre secondaire commun, en adoptant les technologies CDM et/ou TDM et/ou FDM, différents groupes de DMRS en boucle ouverte sont multiplexés sur un ou plusieurs symboles de multiplexage par répartition orthogonale de la fréquence (OFDM) parmi les troisième, quatrième, cinquième, et sixième symboles OFDM d'intervalles de temps pairs et les zéroième, premier, deuxième, quatrième, cinquième, et sixième symboles OFDM d'intervalles de temps impairs d'un cadre secondaire. La même valeur pondérée ou des valeurs pondérées différentes sont utilisées pour un traitement de pondération correspondant sur les différents groupes de DMRS en boucle ouverte. Dans le procédé pour le traitement d'un signal de référence dans un système MIMO en boucle ouverte selon la présente invention, une conception pilote de boucle ouverte est réalisée sur base du DMRS, de sorte que les valeurs pondérées précodées sur le côté réseau ou les valeurs pondérées de formation de faisceau ne sont pas limitées par un algorithme de compression, ce qui améliore la précision des valeurs pondérées précodées ou des valeurs pondérées de formation de faisceau, et améliore autant que possible les performances d'un équipement utilisateur dans un mode en boucle ouverte sans augmenter la complexité de mise en œuvre de l'équipement utilisateur et la complexité des essais ni la consommation de ressources.
PCT/CN2012/075682 2011-07-05 2012-05-17 Procédé et système de traitement d'un signal de référence dans un système mimo en boucle ouverte Ceased WO2013004109A1 (fr)

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CN112039570B (zh) * 2020-08-13 2023-11-03 上海道生物联技术有限公司 一种导频发送和检测方法、发送端及接收端

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