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WO2018130017A1 - Procédé et système de conception de signal pour communication ofdm, émetteur et récepteur - Google Patents

Procédé et système de conception de signal pour communication ofdm, émetteur et récepteur Download PDF

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Publication number
WO2018130017A1
WO2018130017A1 PCT/CN2017/113415 CN2017113415W WO2018130017A1 WO 2018130017 A1 WO2018130017 A1 WO 2018130017A1 CN 2017113415 W CN2017113415 W CN 2017113415W WO 2018130017 A1 WO2018130017 A1 WO 2018130017A1
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WIPO (PCT)
Prior art keywords
preamble
data
user equipment
resource
sequence
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Ceased
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PCT/CN2017/113415
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English (en)
Chinese (zh)
Inventor
曹伟
杨振
芮华
黄伟芳
杨扬
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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
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2692—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2692—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
    • H04L27/2694—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver adaptive design

Definitions

  • the present application relates to the field of communication technologies, such as a signal design method and system for OFDM communication, a transmitter, and a receiver.
  • the Internet of Things application is one of the main application scenarios of 5G communication. Specific application examples include public utility meter reading, environmental data monitoring, and logistics tracking. Its service characteristics are: the number of terminals is large, sporadic data packets, and the data rate is low. These business characteristics place new demands on the corresponding signal design and transceiver devices: low-cost overhead, low power consumption, and support for large connections.
  • the related LTE random access procedure requires multiple interactions between the upstream and downstream MSG1 to MSG5. In this way, if the incidental packet service is used for the Internet of Things application, the ratio of the current cost to the entire system resource will be too large.
  • 3.5G requires support for 1 million/km ⁇ 2 IoT terminal density. This terminal density makes the service model and the related LTE service model different, and the base station must support more dense concurrent access requests.
  • the present disclosure provides a signal design method and system for OFDM (Orthogonal Frequency Division Multiplexing) communication, a transmitter, and a receiver, which are used to solve the problem of random access process in OFDM communication in the related art.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the present disclosure provides a signal design method for OFDM communication, including: dividing a root of a preamble ZC sequence to which a target cell is allocated into at least two groups, and applying different roots to each group root in the preamble sequence Orthogonal code to form a preamble resource pool; selecting a corresponding preamble resource from the preamble resource pool to generate a preamble portion of a communication signal of the user equipment; and generating a data portion of the communication signal of the user equipment by applying a spreading code to the transmission data, To implement concurrent access by a multi-user device; combining the preamble portion and the data portion into a frame.
  • the present disclosure also provides a signal design method for OFDM communication, comprising: performing preamble detection on a preamble portion of a received communication signal of a user equipment; wherein the communication signal includes the preamble portion and data Part: the preamble portion includes an orthogonal code; the data portion is generated by applying a spreading code on the original data symbol; and corresponding data is received according to a correspondence between the preamble portion and the data portion.
  • the present disclosure further provides a transmitter configured to divide a root of a preamble ZC sequence to which a target cell is allocated into at least two groups, and apply different orthogonal codes to each group root of the preamble ZC sequence respectively.
  • the transmitter includes: a preamble generating unit, configured to select a preamble resource from the preamble resource pool to generate a preamble portion of a communication signal of the user equipment; and a data generating unit configured to transmit by using The data application spreading code generates a data portion of the communication signal of the user equipment to implement concurrent access by the multi-user device; the framing unit is configured to combine the leading portion and the data portion into a frame.
  • the present disclosure further provides a receiver, including: a preamble detecting unit configured to perform preamble detection on a preamble portion of a received communication signal of a user equipment; wherein the communication signal includes a preamble portion and a data portion;
  • the preamble portion includes an orthogonal code; the data portion is generated by applying a spreading code on the original data symbol; and the data receiving unit is configured to perform corresponding data according to a correspondence between the preamble portion and the data portion receive.
  • the present disclosure also provides an OFDM communication system including a transmitter and a receiver; the transmitter configured to divide a root of a preamble ZC sequence to which a target cell is allocated into at least two groups, for a preamble Each group of roots of the ZC sequence respectively applies a different orthogonal code to form a preamble resource pool; the transmitter is further configured to: select a corresponding preamble resource from the pool of the preamble resources to generate a leading part of the communication signal of the user equipment; Applying a spreading code to the transmission data to generate a data portion of the communication signal of the user equipment to implement concurrent access by the multi-user equipment; combining the preamble portion and the data portion into a frame; the receiver is configured to: receive Preamble detection of the communication signal of the user equipment to the preamble; wherein the communication signal includes a preamble portion and a data portion; the preamble portion includes an orthogonal code; and the data portion is generated by applying a spreading code on the original data symbol; Corresponding
  • the present disclosure also provides a transmitter including a processor for performing data processing, a memory configured to store data, and a data transceiver configured to transmit and/or receive data, the memory configured to store signals for implementing OFDM communication
  • a transmitter including a processor for performing data processing, a memory configured to store data, and a data transceiver configured to transmit and/or receive data, the memory configured to store signals for implementing OFDM communication
  • An instruction of the design method the processor being configured to execute the instruction stored by the memory, dividing a root of a preamble ZC sequence to which the target cell is allocated into at least two groups, each group root of the preamble ZC sequence applying a different positive Transmitting to form a pool of preamble resources, when the processor executes the instruction stored by the memory, performing the step of: selecting a corresponding preamble resource from the pool of preamble resources to generate a preamble portion of a communication signal of the user equipment; Applying a spreading code to the transmission data to generate a data portion of the communication
  • the present disclosure also provides a receiver comprising a processor for performing data processing, a memory configured to store data, and a data transceiver configured to transmit and/or receive data, the memory configured to be implemented for storage
  • a receiver comprising a processor for performing data processing, a memory configured to store data, and a data transceiver configured to transmit and/or receive data, the memory configured to be implemented for storage
  • An instruction of a signal design method of OFDM communication the processor being configured to execute an instruction stored by the memory, and when the processor executes the instruction stored by the memory, performing the step of: receiving the user equipment
  • the preamble portion of the communication signal performs preamble detection; wherein the communication signal includes the preamble portion and the data portion; the preamble portion includes an orthogonal code; the data portion is generated by applying a spreading code on the original data symbol; Corresponding data is received by the correspondence between the preamble portion and the data portion.
  • a computer readable storage medium storing computer executable instructions configured to perform the above method.
  • the transmitter, and the receiver adopt a compact structure in which a preamble portion and a data portion are adjacently arranged, so that the base station can be completed at one time.
  • the process of user equipment discovery and data reception eliminates multiple access message interactions and effectively improves communication efficiency.
  • the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment
  • the data part adopts the multiple access technology of the spreading code, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment.
  • FIG. 1 is a flowchart of a signal design method for OFDM communication provided by an embodiment of the present disclosure
  • FIG. 2 is a schematic diagram of a time domain structure of an uplink signal of a physical layer in an embodiment of the present disclosure
  • FIG. 3 is another flowchart of a signal design method for OFDM communication provided by an embodiment of the present disclosure
  • FIG. 4 is a flowchart of operations performed by a transmitting end in a signal design method for OFDM communication provided by an embodiment of the present disclosure
  • FIG. 5 is a flowchart of operations performed by a receiving end in a signal design method for OFDM communication provided by an embodiment of the present disclosure
  • FIG. 6 is a schematic diagram of a time domain structure of an uplink signal of a physical layer in an embodiment of the present disclosure
  • FIG. 7 is a schematic diagram of a time domain structure of an uplink signal of a physical layer in another embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a transmitter according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a receiver provided by an embodiment of the present disclosure.
  • an embodiment of the present disclosure provides a signal design method for OFDM communication, which includes dividing a root of a leading Zadoff-Chu (ZC) sequence to which a target cell is allocated into at least two groups, for each group.
  • the roots respectively apply different orthogonal codes to form a pool of preamble resources, and the method further includes:
  • a signal design method for OFDM communication adopts a preamble portion and a data portion together to form a frame to form a compact structure of adjacent placement, and the preamble portion can be used for operation of user equipment discovery, frequency offset estimation, and the like. Therefore, the base station can complete the process of user equipment discovery and data reception in one time, eliminating multiple access message interactions, and effectively improving communication efficiency.
  • the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment
  • the data part adopts the multiple access technology of the spreading code, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment.
  • the preamble portion is configured to perform at least one of the following operations on the user equipment: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.
  • the base station may provide a preamble resource pool for each cell served by the base station, so that the user equipment can select a corresponding preamble resource to communicate in the corresponding preamble resource pool.
  • the pilot resource pool allocated by each cell is different.
  • the preamble resources in the pool of preamble resources may be generated by a preamble ZC sequence.
  • the signal design method for OFDM communication may further include: generating a ZC sequence of a corresponding length according to a number of available subcarriers of the preamble portion in a target cell time-frequency resource, the ZC sequence having a preset number of roots.
  • a cyclic shift can be applied to the corresponding ZC sequence to provide multiple access resources on a single root.
  • the transmitting end has the following resources: in the time domain, the preamble and the data each occupy one subframe with a duration of 1 ms, and the total duration is 2 ms.
  • the preamble subframe includes a zero-padding interval of 0.1375 ms and three consecutive preamble symbols.
  • the length of a single preamble symbol (including the cyclic prefix CP) is 0.2875 ms.
  • the data sub-frame contains 14 data symbols, which are in accordance with the relevant LTE system definition.
  • the system bandwidth is 720 kHz
  • the preamble subcarrier spacing is 3.75 kHz, data.
  • the symbol subcarrier spacing is 15 kHz.
  • the number of available subcarriers in the preamble is 192, and the number of available subcarriers in the data portion is 48.
  • the number of available subcarriers in the preamble is 192, and a number of preset sequences of length 192 can be generated.
  • the preamble portion adopts a ZC sequence, and the root sequence length is 191, and the loop is extended to a length of 192 to occupy 192 subcarriers.
  • the roots of the leading ZC sequence to which the target cell is allocated may be divided into at least two groups, and different orthogonal codes are respectively applied to each group root to form a preamble.
  • the resource pool, the length of the orthogonal code can be equal to the number of packets of the root.
  • the hetero root interference is also suppressed, including interference from the alien root user equipment in the cell and/or interference originating from the heterogeneous user equipment between the cells.
  • the manner in which the preamble portion occupies the subcarrier may include:
  • the preamble portion is placed consecutively on all subcarriers of the occupied bandwidth;
  • the preamble portions are equally spaced across the subcarriers over the occupied bandwidth to form a comb structure.
  • the root of the preamble ZC sequence to which the target cell is allocated is divided into at least two groups, and different orthogonal codes are respectively applied to each group root to form a preamble resource pool. It can include the following steps:
  • the size of the preamble resource pool is among them The number of roots of the leading ZC sequence allocated for the target cell, And a number of available cyclic shifts configured on a single root of the target cell; grouping roots of the preamble ZC sequence, and applying different orthogonal codes to each group root of the preamble ZC sequence, the number of packets being equal to orthogonal Code length
  • each subcarrier group of the comb structure constitutes an orthogonal preamble time-frequency resource sub-pool, and is grouped according to the following rules.
  • Orthogonal code application when the target cell is configured to apply all the roots of the preamble ZC sequence to all resource subpools, the size of the preamble resource pool is determined as among them The number of subcarrier groups divided for the comb structure; group the roots on each resource subpool, and apply different orthogonal codes to each group root on each resource subpool, the number of packets being equal to the orthogonal code length And the orthogonal code groups used by each resource subpool are the same.
  • the size of the preamble resource pool is configured when the target cell is configured to apply different roots to different resource sub-pools, and at least one different root is applied to at least one resource sub-pool, and all the roots are used. Determined as among them Is the number of roots applied in the i-th resource sub-pool; group all roots on each resource sub-pool, and apply different orthogonal codes to each group root on each resource sub-pool, the number of packets is equal to orthogonal
  • the code length is the same for each resource subpool.
  • the preamble part of the communication signal of the user equipment may be generated by selecting the corresponding preamble resource from the pool of the preamble resources, which may include:
  • a corresponding orthogonal code is applied to the at least two preamble symbols to generate a preamble portion of the communication signal of the user equipment.
  • the length of the orthogonal code may be less than or equal to the number of repetitions of the preamble symbol, and in a case where the length of the orthogonal code is less than the number of repetitions of the preamble symbol, The orthogonal code is applied to all preamble symbols in an at least partially repeated manner.
  • the preamble portion includes three preamble symbols, and each of the preamble symbols additionally applies one delay deflection sequence, the length of which is also 192, and the granularity of the delay deflection angle is 2 ⁇ /32.
  • Step 2 cyclically expand the root sequence to generate a base sequence:
  • y u (n) [x u (0)x u (1)...x u (N ZC -1)x u (0)], according to the sequence in this example, is cyclically extended to a sequence of length 192.
  • Step 3 delay the deflection of the base sequence, and load the delay deflection sequence as Where 0 ⁇ n ⁇ N ZC -1.
  • the UE can randomly select one u and one n CS from the available resources of the preamble to construct its preamble sequence. If u is an odd number, then 3 consecutive preamble symbols apply an orthogonal code [+1 +1 +1] in the time domain. If u is even, then 3 consecutive preamble symbols apply the orthogonal code [+1 -1 +1] in the time domain. It can be seen that the codes of two adjacent preamble symbols constitute an orthogonal pair having a code length of two.
  • the data part of the communication signal of the user equipment may be generated by applying a spreading code to the transmission data, so as to implement concurrent access by the multi-user equipment, which may include the following steps:
  • a spreading code is applied to the original data symbols for data expansion to form a data portion of the communication signal.
  • the data part may be extended by MUSA, specifically a complex value spreading code with a code length of 4.
  • the resource pool size of the spreading code is also set to 128, and the corresponding spreading code can be randomly selected from the spreading code resource pool.
  • the preamble resource and the spreading code resource adopt a one-to-one binding. That is, when the user equipment selects the preamble resource from the preamble resource pool, the extension code of the data part is also determined.
  • each original modulation symbol is expanded into four modulation symbols including spreading codes, and the expanded modulation symbols are placed in a frequency domain after the frequency domain.
  • the application of the spreading code on each original data symbol may include an application only in the time domain, an application only in the frequency domain, or an application in the time domain and the frequency domain.
  • the signal structure of the communication signal of the composite frame in the time domain may include one of the following: (1) the preamble portion and the data portion are successively placed; (2) the preamble portion and the data portion are respectively divided into multiple And a plurality of segments of the leading portion and the plurality of segments of the data portion are interleaved with each other.
  • Two placements In the formula, the specific structure of the uplink signal of the physical layer can be as shown in FIG. 2 .
  • the time domain structure of two possible preamble+data is shown.
  • Fig. 2(a) is a time domain structure placed continuously
  • Fig. 2(b) is a time domain structure interlaced.
  • FIG. 2 provides only one example, and the number of repetitions is not limited to two.
  • the preamble portion may include at least two preamble symbols
  • the data portion may include at least one data symbol
  • the preamble portion and the data portion may occupy the same or different bandwidths in the frequency domain, and the frequency domain resources occupied by the preamble portion and the data portion may at least partially overlap.
  • the preamble resource corresponding to the preamble part and the spreading code may have a one-to-one or many-to-one mapping relationship.
  • an embodiment of the present disclosure further provides a signal design method for OFDM communication, where the method is based on a receiving end, including:
  • S31 Perform preamble detection on a preamble portion of the received communication signal of the user equipment, where the communication signal includes a preamble portion and a data portion; the preamble portion includes an orthogonal code; and the data portion is applied by using the original data symbol Extension code generation;
  • the signal design method for OFDM communication adopts a combination of a preamble portion and a data portion to form a compact structure of adjacent placement, so that the base station can complete the process of user equipment discovery and data reception at one time, free of Going to multiple access message interactions effectively improves communication efficiency.
  • the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment
  • the data part adopts the spreading code multiple access technology, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment, which greatly Improve the spectrum efficiency of the entire network.
  • the preamble portion is configured to perform at least one of the following operations on the user equipment: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.
  • the receiver applies the measurement to the preamble resource, such as detecting at least one user equipment, and applies the corresponding measurement quantity to the subsequent data decoding of the user equipment. Since multiple concurrent user equipment data can be superimposed on the data symbols using non-orthogonal multiple access techniques, the receiver can employ multiple, but not limited to, continuous interference cancellation (SIC) techniques to resolve multiple concurrent user equipment.
  • SIC continuous interference cancellation
  • orthogonal code suppression is used
  • Inter-device interference may include interference between user equipments in a cell or between user equipments in a neighboring cell. The embodiments of the present disclosure do not limit this.
  • step S31 performing preamble detection on the preamble portion of the received communication signal may include:
  • Compensating for interference in the preamble portion based at least in part on the orthogonal encoding in the preamble portion;
  • Performing at least one of the following operations on the preamble portion user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.
  • the preamble sequence has good autocorrelation and cross-correlation properties, the sequence length of which depends on the total bandwidth and subcarrier spacing occupied.
  • the user equipment at the receiving end finds whether the peak energy obtained by the autocorrelation exceeds a certain threshold.
  • the frequency offset estimation can be obtained by, but not limited to, using a conventional time domain correlation algorithm.
  • the inter-symbol correlation or the intra-symbol correlation can be determined according to the number of preamble symbols.
  • the time offset estimation can be obtained by, but not limited to, using a conventional frequency domain correlation algorithm. In this case, whether or not to use inter-symbol averaging can be used according to the number of preamble symbols to obtain a more accurate measurement.
  • the noise estimate can be, but is not limited to, utilized in the user equipment discovery phase, without the autocorrelation result of the user equipment being detected.
  • Channel estimation for data demodulation can be obtained by interpolation or averaging of channel estimates on the preamble symbols, depending on how the preamble symbols occupy the subcarriers.
  • corresponding data reception may be performed according to a correspondence between the preamble portion and the data portion.
  • the correspondence between the preamble portion and the data portion may include: mapping relationship between a preamble resource of the preamble portion and the spreading code, and occupying a frequency band of the preamble portion and occupying the data portion Correspondence between frequency bands.
  • the preamble portion and the data portion may occupy the same or different bandwidths in the frequency domain; the frequency domain resources occupied by the preamble portion and the data portion may at least partially overlap.
  • the size of the preamble resource pool and the data spreading code resource pool may be inconsistent, and the mapping relationship between the preamble resource and the data spreading code may be one-to-one or many-to-one.
  • the preamble resource and/or orthogonal code resource randomly selected by the user equipment determines the extent of the spreading code used by the data portion of the user equipment. Since the preamble subcarrier spacing can be different from the data symbol subcarrier spacing, the receiving and transmitting ends need to support signal processing of different subcarrier spacings. These signal processing include, but are not limited to, different size FFT modules, up and down sampling filter modules that match corresponding subcarrier spacing, SIC modules, and the like.
  • the corresponding data reception may include:
  • Corresponding data reception is performed on all detected user equipments according to the channel estimation of the data portion and the spreading code.
  • the time-frequency resource of the received data is: in the time domain, the preamble and the data each occupy one subframe with a duration of 1 ms, and the total duration is 2 ms.
  • the preamble subframe includes a zero-padding interval of 0.1375 ms and three consecutive preamble symbols.
  • the length of a single preamble symbol (including the cyclic prefix CP) is 0.2875 ms.
  • the data sub-frame contains 14 data symbols, which are in accordance with the relevant LTE system definition.
  • the system bandwidth is 720 kHz
  • the preamble symbol subcarrier spacing is 3.75 kHz
  • the data symbol subcarrier spacing is 15 kHz.
  • the number of available subcarriers in the preamble is 192, and the number of available subcarriers in the data portion is 48.
  • a certain front-end processing may be performed first, which may specifically include:
  • the three preamble symbols in the time domain are extracted, the CP is removed, and the FFT transform frequency domain is obtained, and three frequency domain sequences are obtained.
  • the ZC base sequence (length 192) corresponding to each root is sequentially used for local sequence conjugate compensation.
  • the orthogonal codes of two adjacent preamble symbols eliminate the interference on the other two roots whose parity is inconsistent. For example, on root 1, there is only interference on stub 3, and the preambles that may exist on roots 2 and 4 are eliminated because of orthogonal codes.
  • IFFT Inverse Fast Fourier Transform
  • the pre-detection detection may be performed, which may specifically include:
  • the noise floor and the detection threshold are calculated using the 2-line time domain values obtained by the above IFFT transformation.
  • the energy is obtained for each sample of the above two rows of time domain values, and then the corresponding points are summed to become one row time domain value, and then multi-antenna combining is performed to construct a preamble detection index, which is compared with the detection threshold.
  • the respective time offsets, frequency offsets, and channel estimation values are calculated in order.
  • the data can be received according to the preamble detection result, which may specifically include:
  • the reception of the data portion is performed in order.
  • the channel estimated by the current UE preamble (corresponding to the subcarrier spacing of 3.75 kHz) is taken, and each successive value is linearly averaged to obtain a channel estimation value corresponding to the 15 kHz subcarrier spacing.
  • interpolation in the time domain is performed to obtain channel estimation values on each data symbol.
  • the channel estimation value after the interpolation is applied point by point according to the spreading code corresponding to the current UE preamble for subsequent equalization.
  • the data portion is equalized using the above-mentioned expanded channel estimation value, and then each successive 4 values are combined for despreading to obtain an equalized modulation symbol.
  • the current user equipment frequency domain data is reconstructed and the SIC cancellation operation is performed.
  • the next detected UE repeats the above operation until all UEs are processed.
  • the embodiment of the present disclosure provides a signal design method for OFDM communication, and the operation flow performed by the transmitting end may be as shown in FIG. 4, and the operation flow performed by the receiving end may be as shown in FIG. 5.
  • the preamble and the data each occupy a subframe of 1 ms duration, and the total duration is 2 ms.
  • the preamble subframe includes a zero-padding interval of 0.1375 ms and three consecutive preamble symbols.
  • the length of a single preamble symbol (including the cyclic prefix CP) is 0.2875 ms.
  • the data sub-frame contains 14 data symbols, which are in accordance with the relevant LTE system definition.
  • the three preamble symbols are divided into two groups, each group contains two adjacent preamble symbols, and each group applies an orthogonal code with a code length of two, and the orthogonal code elements on the overlapping symbols need to maintain the consistency between the groups.
  • the system bandwidth is 720 kHz
  • the preamble symbol subcarrier spacing is 3.75 kHz
  • the data symbol subcarrier spacing is 15 kHz.
  • the number of available subcarriers in the preamble is 192
  • the number of available subcarriers in the data portion is 48.
  • the preamble symbol uses a ZC sequence with a root sequence length of 191, and the loop is extended to a length of 192 to occupy 192 subcarriers.
  • An additional delay deflection sequence is applied to each preamble, the length of which is also 192, and the granularity of the delay deflection angle is 2 ⁇ /32.
  • the sequence loaded with the delay deflection is Where 0 ⁇ n ⁇ N ZC -1.
  • the UE randomly selects 1 u and 1 n CS to construct its preamble sequence. If u is an odd number, then 3 consecutive preamble symbols apply an orthogonal code [+1 +1 +1] in the time domain. If u is an even number, then 3 consecutive preamble symbols apply an orthogonal code [+1 -1 +1] in the time domain. It can be seen that the codes of two adjacent preamble symbols constitute an orthogonal pair having a code length of two.
  • the data part is extended by MUSA, specifically a complex value spreading code with a code length of 4.
  • the resource pool size of the spreading code is also set to 128, and the preamble resource and the spreading code resource are bound by one-to-one correspondence. That is, when the user equipment selects the preamble resource, the extension code of the data part is also determined.
  • each original modulation symbol is expanded into four modulation symbols including spreading codes, and the expanded modulation symbols are placed in a frequency domain after the frequency domain.
  • the receiver process includes the following steps:
  • the three preamble symbols in the time domain are extracted, the CP is removed, and the fast Fourier transform FFT is performed to transform into the frequency domain, and three frequency domain sequences are obtained.
  • the ZC base sequence (length 192) corresponding to each root is sequentially used for local sequence conjugate compensation.
  • the orthogonal codes of two adjacent preamble symbols eliminate the interference on the other two roots whose parity is inconsistent. For example, on root 1, there is only interference on stub 3, and the preambles that may exist on roots 2 and 4 are eliminated because of orthogonal codes.
  • the noise floor and the detection threshold are calculated using the 2-line time domain values obtained by the above IFFT transformation.
  • the energy is obtained for each sample of the above two rows of time domain values, and then the corresponding points are summed to become one row time domain value, and then multi-antenna combining is performed to construct a preamble detection index, which is compared with the detection threshold.
  • For the above 1 row time domain value perform preamble detection in each time window, output the detected UE, and press the window.
  • the internal power is sorted from large to small; for the detected UE, the time offset, frequency offset and channel estimation value are calculated according to the ranking.
  • the reception of the data portion is performed in order.
  • the channel estimated by the current UE preamble (corresponding to the subcarrier spacing of 3.75 kHz) is taken, and each successive value is linearly averaged to obtain a channel estimation value corresponding to the 15 kHz subcarrier spacing.
  • interpolation in the time domain is performed to obtain channel estimation values on each data symbol.
  • the channel estimation value after the interpolation is applied point by point according to the spreading code corresponding to the current UE preamble for subsequent equalization.
  • the data portion is equalized using the above-mentioned expanded channel estimation value, and then each successive 4 values are combined for despreading to obtain an equalized modulation symbol.
  • the current user equipment frequency domain data is reconstructed and the SIC cancellation operation is performed.
  • the next detected UE repeats the above operation until all UEs are processed.
  • the base station can complete the process of user equipment discovery and data reception in one time, and avoids multiple access message interactions.
  • the application of orthogonal codes in the preamble can effectively suppress multi-user equipment interference, making each measurement more accurate and facilitating subsequent data demodulation of multi-user equipment.
  • the data symbol is applied to the orthogonal/non-orthogonal multiple access technology, so that the base station can support the data transmission of the concurrent user equipment, which can reduce the delay of the data transmission by the user equipment and improve the spectrum efficiency of the entire network.
  • the correspondence between the preamble resource and the data resource enables the base station to determine the data part spreading code or the low complexity blind detection to determine the data part spreading code after successfully detecting the preamble.
  • the preamble and the data each occupy 4 subframes with a duration of 1 ms, which are staggered according to a 2 ms structure.
  • Each 2ms preamble segment includes a zero-padded interval of 0.2875ms and two consecutive preamble symbols.
  • the length of a single preamble symbol (including the cyclic prefix CP) is 0.85625ms.
  • Each 2ms data segment contains 28 data symbols, that is, every 1ms structure conforms to the relevant LTE system definition.
  • the four preamble symbols are divided into two groups that do not overlap, each group contains two adjacent preamble symbols, and each group applies an orthogonal code with a code length of two.
  • the contents of the data portion 1 and the data portion 2 are different, and the expanded modulation symbols are divided into equal-sized two blocks and placed after the corresponding leading portions.
  • the system bandwidth is 180 kHz
  • the preamble symbol subcarrier spacing is 1.25 kHz
  • the data symbol subcarrier spacing is 15 kHz.
  • the number of available subcarriers in the preamble is 144, and the number of available subcarriers in the data portion is 12.
  • the preamble symbol uses a ZC sequence whose root sequence length is 139 and the loop is extended to a length of 144 to occupy 144 subcarriers.
  • An additional delay deflection sequence is applied to each preamble symbol, which is also 144 in length, and the granularity of the delay deflection angle is 2 ⁇ /24.
  • the middle sequence loop is expanded to a sequence of length 144.
  • the sequence loaded with the delay deflection is Where 0 ⁇ n ⁇ N ZC -1.
  • the UE randomly selects 1 u and 1 n CS to construct its preamble sequence. If u is an odd number, then 2 consecutive preamble symbols apply an orthogonal code [+1 +1] in the time domain. If u is an even number, two consecutive preamble symbols apply an orthogonal code [+1 -1] in the time domain. It can be seen that the codes of two adjacent preamble symbols constitute an orthogonal pair having a code length of two.
  • the data part is extended by MUSA, specifically a complex value spreading code with a code length of 4.
  • the resource pool size of the spreading code is also set to 96, and the preamble resource and the spreading code resource are bound by one-to-one correspondence. That is, when the user equipment selects the preamble resource, the extension code of the data part is also determined.
  • each original modulation symbol is expanded into four modulation symbols including a spreading code, and the expanded modulation symbols are placed in a frequency domain of the first time domain.
  • the receiver process includes the following steps:
  • the four preamble symbols in the time domain are extracted, the CP is removed, and the FFT is performed to transform into the frequency domain, and four frequency domain sequences are obtained.
  • the ZC base sequence (length 144) corresponding to each root is sequentially used for local sequence conjugate compensation.
  • the orthogonal codes of two adjacent preamble symbols eliminate the interference on the other two roots whose parity is inconsistent. For example, on root 1, there is only interference on stub 3, and the preambles that may exist on roots 2 and 4 are eliminated due to different orthogonal codes.
  • the noise floor and the detection threshold are calculated using the 2-line time domain values obtained by the above IFFT transformation.
  • the energy is obtained for each sample of the above two rows of time domain values, and then the corresponding points are summed to become one row time domain value, and then multi-antenna combining is performed to construct a preamble detection index, which is compared with the detection threshold.
  • the respective time offsets, frequency offsets, and channel estimation values are calculated in order.
  • the reception of the data portion is performed in order.
  • the channel estimated by the current UE preamble (corresponding to the subcarrier spacing of 1.25 kHz) is taken, and each successive 12 values are linearly averaged to obtain a channel estimation value corresponding to the 15 kHz subcarrier spacing.
  • interpolation in the time domain is performed to obtain channel estimation values on each data symbol.
  • the channel estimation value after the interpolation is applied point by point according to the spreading code corresponding to the current UE preamble for subsequent equalization.
  • the data portion is equalized using the above-mentioned expanded channel estimation value, and then each successive 4 values are combined for despreading to obtain an equalized modulation symbol.
  • the current user equipment frequency domain data is reconstructed and the SIC cancellation operation is performed.
  • the next detected UE repeats the above operation until all UEs are processed.
  • the LTE narrowband Internet of Things system based on frequency domain extension, and a 2-to-1 preamble-spreading code mapping is taken as an example.
  • the time-frequency resource is the same as in Embodiment 1.
  • the leading symbol design is the same as in the first embodiment.
  • the data part is extended by MUSA, specifically a complex value spreading code with a code length of 4.
  • the resource pool size of the spreading code is set to 64, and the smaller resource pool means that the average correlation between the spreading codes is lower, that is, the non-orthogonal interference of the data portion is smaller.
  • the preamble resource and the spreading code resource adopt a 2-to-1 binding. That is, when the user equipment selects the preamble resource, the extension code of the data part is also determined. Selected differently For the user equipment, it is possible that the extension code is the same. In this way, the user equipment can obtain the respective measurement quantity and channel estimation value without the collision of the preamble, and then use the power domain degree of freedom to solve the respective data through the SIC receiver processing.
  • the receiver design receiver flow is the same as in Embodiment 1.
  • an embodiment of the present disclosure further provides a transmitter, where the roots of the preamble ZC sequence to which the target cell is allocated are divided into at least two groups, and different orthogonal codes are respectively applied to each group root.
  • a pool of leading resources including:
  • the preamble generating unit 81 is configured to select a preamble resource from the preamble resource pool to generate a preamble portion of the communication signal of the user equipment;
  • the data generating unit 82 is configured to generate a data part of the communication signal of the user equipment by applying a spreading code to the transmission data, so as to implement concurrent access by the multi-user equipment;
  • a framing unit 83 is configured to combine the preamble portion and the data portion into a frame.
  • the transmitter provided by the embodiment of the present disclosure adopts a combination of a preamble portion and a data portion to form a compact structure for adjacent placement, and the preamble portion can be used for operation of user equipment discovery, frequency offset estimation, etc., so that the base station can be completed in one time.
  • the process of user equipment discovery and data reception eliminates multiple access message interactions and effectively improves communication efficiency.
  • the preamble part contains orthogonal codes to suppress multi-user equipment interference
  • the data part adopts multiple access technology of orthogonal/non-orthogonal spreading codes, so that the base station can support concurrent user equipment data transmission, thereby effectively reducing users.
  • the device sends data delay, which greatly improves the spectrum efficiency of the entire network.
  • the preamble portion is configured to perform at least one of the following operations on the user equipment: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.
  • the preamble portion and the data portion are consecutively placed in a time domain, or the preamble portion and the data portion are respectively divided into a plurality of segments, and the preamble portion is The segments and the plurality of segments of the data portion are interleaved with each other.
  • the preamble portion includes at least two preamble symbols
  • the data portion includes at least one data symbol
  • the preamble portion and the data portion occupy the same or different bandwidths in the frequency domain;
  • the frequency domain resources occupied by the preamble portion and the data portion at least partially overlap.
  • the spreading code has a one-to-one or many-to-one mapping relationship with the preamble resources corresponding to the preamble portion.
  • the transmitter may further include a sequence generating unit configured to divide the roots of the preamble ZC sequence to which the target cell is allocated into at least two groups, and apply different orthogonal codes to each group root to form a preamble Before the resource, a ZC sequence of a corresponding length is generated according to the number of available subcarriers of the preamble portion in the target cell time-frequency resource, and the ZC sequence has a preset number of roots.
  • a sequence generating unit configured to divide the roots of the preamble ZC sequence to which the target cell is allocated into at least two groups, and apply different orthogonal codes to each group root to form a preamble Before the resource, a ZC sequence of a corresponding length is generated according to the number of available subcarriers of the preamble portion in the target cell time-frequency resource, and the ZC sequence has a preset number of roots.
  • the manner in which the preamble portion occupies a subcarrier may include:
  • the preamble portion is placed consecutively on all subcarriers of the occupied bandwidth;
  • the preamble portions are equally spaced across the subcarriers over the occupied bandwidth to form a comb structure.
  • the transmitter may further include a preamble resource generating unit, which is configurable:
  • the size of the preamble resource pool is among them The number of leading ZC sequence roots assigned to the target cell, And the number of available cyclic shifts configured on a single root of the target cell; grouping all roots of the ZC sequence, and applying different orthogonal codes to each group root, the number of packets being equal to the orthogonal code length;
  • each subcarrier group of the comb structure constitutes an orthogonal preamble time-frequency resource sub-pool, and is grouped according to the following rules. Orthogonal code application:
  • the size of the pre-lead resource pool is among them
  • the orthogonal code groups used by each resource subpool are the same;
  • the target cell is configured with different roots applied to different resource sub-pools, and at least one resource sub-pool is applied with at least two different roots, and all the roots are used, the size of the leading resource pool is among them
  • the orthogonal code groups are the same.
  • the preamble generating unit 81 may include:
  • a selection module configured to select a preamble resource from the pool of preamble resources to generate a preamble sequence of the user equipment
  • a transform module configured to perform an IFFT transform on the selected preamble sequence to form a preamble symbol in the time domain, and repeatedly placing the preamble symbol in the time domain at least twice to form at least two preamble symbols;
  • a generating module configured to apply a corresponding orthogonal code to the at least two preamble symbols to generate a leading portion of the communication signal of the user equipment.
  • the length of the orthogonal coding is less than or equal to the number of repetitions of the preamble symbol, and in a case where the length of the orthogonal coding is less than the repetition number of the preamble symbol, the orthogonal coding is completed at least Partially repeated methods apply to all leading symbols.
  • the autocorrelation coefficient of the preset sequence is greater than a first threshold, and the cross-correlation coefficient of the preset sequence is less than a second threshold.
  • the data generating unit 82 includes: a modulation module configured to modulate transmission data of each user equipment into original data symbols; and an expansion module configured to apply a spreading code to the original data symbol for data expansion to form the The data portion of the communication signal.
  • the application of the spreading code on each original data symbol includes applications only in the time domain, only in the frequency domain or in the time domain and frequency domain.
  • the applying only in the time domain comprises: expanding the original modulation symbol into 1 code consecutive time domain symbols in the time domain, where l code is a spreading code length;
  • the application only in the frequency domain includes: expanding the original modulation symbol into 1 code consecutive frequency domain symbols in the frequency domain, and l code is a spreading code length;
  • the application in the time domain and the frequency domain includes: expanding the original modulation symbol into a time-frequency domain Continuous time-frequency domain symbols, For the extension code length.
  • an embodiment of the present disclosure further provides a receiver, including:
  • a preamble detecting unit 91 configured to perform preamble detection on a preamble portion of the received communication signal of the user equipment; wherein the communication signal includes a preamble portion and a data portion; the preamble portion includes An orthogonal code; the data portion is generated by applying a spreading code on the original data symbol;
  • the data receiving unit 92 is configured to perform corresponding data reception according to a correspondence between the preamble portion and the data portion.
  • the receiver provided by the embodiment of the present disclosure adopts a compact structure in which the preamble portion and the data portion are adjacently arranged, so that the base station can complete the process of user equipment discovery and data reception in one time, thereby eliminating multiple access message interactions and effectively improving. Communication efficiency.
  • the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment
  • the data part adopts the spreading code multiple access technology, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment, which greatly Improve the spectrum efficiency of the entire network.
  • the preamble detecting unit 91 may include: an interference cancellation module configured to at least partially cancel interference in the preamble portion according to the orthogonal coding in the preamble portion; a preamble processing module configured to perform the preamble portion At least one of the following operations: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.
  • the correspondence between the preamble portion and the data portion may include: a mapping relationship between a preamble resource of the preamble portion and the spreading code, and the preamble portion occupies a frequency band and the data portion occupies Correspondence between frequency bands.
  • the data receiving unit 92 includes: a channel estimation module, configured to learn, according to a correspondence between the preamble portion occupied frequency band and the data portion occupied frequency band, a channel estimation of the data portion by using a channel estimation for the preamble portion; a spreading code determining module, configured to determine, according to a one-to-one or many-to-one mapping relationship between a spreading code of the data portion and a preamble resource of the preamble portion, by using the preamble resource learned in preamble detection a spreading code of the data portion; the data receiving module is configured to perform corresponding data reception on all the detected user equipments according to the channel estimation of the data portion and the spreading code.
  • a channel estimation module configured to learn, according to a correspondence between the preamble portion occupied frequency band and the data portion occupied frequency band, a channel estimation of the data portion by using a channel estimation for the preamble portion
  • a spreading code determining module configured to determine, according to a one-to-one or many-to-one mapping
  • the preamble portion and the data portion occupy the same or different bandwidths in a frequency domain; the preamble portion and the frequency domain resources occupied by the data portion at least partially overlap.
  • the present disclosure further provides an OFDM communication system, including a transmitter and a receiver; the transmitter is configured to divide a root of a preamble ZC sequence to which a target cell is allocated into at least two groups, and apply different groups to each group root Or orthogonal code to form a preamble resource pool; wherein the transmitter is further configured to: select a corresponding preamble resource from the pool of preamble resources to generate a preamble portion of a communication signal of the user equipment; Applying a spreading code to the transmission data to generate a data portion of the communication signal of the user equipment to implement concurrent access by the multi-user equipment; combining the preamble portion and the data portion into a frame; the receiver is configured to: receive Preamble detection of the communication signal of the user equipment to the preamble; wherein the communication signal includes a preamble portion and a data portion; the preamble portion includes an orthogonal code; and the data portion is generated by applying a spreading code on the original data symbol;
  • the preamble detection includes at
  • the OFDM communication system provided by the embodiment of the present disclosure adopts a compact structure in which the preamble portion and the data portion are adjacently arranged, so that the base station can complete the process of user equipment discovery and data reception at one time, thereby eliminating multiple access message interactions and effectively improving. Communication efficiency.
  • the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment
  • the data part adopts the multiple access technology of the spreading code, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment.
  • the preamble portion is configured to perform at least one of the following operations on the user equipment: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.
  • the manner in which the preamble portion occupies a subcarrier includes: the preamble portion is continuously placed on all subcarriers of the occupied bandwidth; or the preamble portion is equally spaced across the subcarriers on the occupied bandwidth to form a comb Structure.
  • the selecting, by the transmitter, the corresponding preamble resource from the pool of the preamble resources to generate a preamble portion of the communication signal of the user equipment including: selecting a preamble resource from the pool of the preamble resources to generate a preamble sequence of the user equipment Performing an IFFT transform on the selected preamble sequence to form a preamble symbol on the time domain, and repeating the preamble symbol at least twice in the time domain to form at least two preamble symbols; applying corresponding to the at least two preamble symbols An orthogonal code to generate a leading portion of the communication signal of the user equipment.
  • embodiments of the present disclosure also provide a transmitter including a processor for performing data processing, a memory for data storage, and a data transceiver for data transmission and/or reception, the memory being used for storage implementation
  • An instruction for a signal design method for OFDM communication the processor is configured to execute the memory stored instruction, and divide a root of a preamble ZC sequence to which a target cell is allocated into at least two groups, each group applying different orthogonalities respectively Code to form a pool of preamble resources, when the processor executes the memory
  • the step of executing includes: selecting a corresponding preamble resource from the pool of preamble resources to generate a preamble portion of a communication signal of the user equipment; and generating a data portion of the communication signal of the user equipment by applying a spreading code to the transmission data To implement concurrent access by the multi-user device; combining the preamble portion and the data portion into a frame.
  • the transmitter provided by the embodiment of the present disclosure adopts a compact structure in which the preamble portion and the data portion are adjacently arranged, so that the base station can complete the process of user equipment discovery and data reception at one time, thereby eliminating multiple access message interactions and effectively improving. Communication efficiency.
  • the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment
  • the data part adopts the multiple access technology of the spreading code, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment.
  • the preamble portion is configured to perform at least one of the following operations on the user equipment: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.
  • the manner in which the preamble portion occupies a subcarrier includes: the preamble portion is continuously placed on all subcarriers of the occupied bandwidth; or the preamble portion is equally spaced across the subcarriers on the occupied bandwidth to form a comb Structure.
  • the step of selecting a corresponding preamble resource from the pool of the preamble resources to generate a preamble portion of the communication signal of the user equipment includes: selecting a preamble resource from the pool of the preamble resources to generate a preamble sequence of the user equipment; Selecting a preamble sequence for IFFT transform, forming a preamble symbol in the time domain, and repeating the preamble symbol at least twice in the time domain to form at least two preamble symbols; applying corresponding orthogonality to the at least two preamble symbols a code to generate a leading portion of the communication signal of the user equipment.
  • embodiments of the present disclosure also provide a receiver including a processor configured to perform data processing, a memory configured to store data, and a data transceiver configured to transmit and/or receive data, the memory being used for Storing instructions implementing a signal design method for OFDM communication, the processor being configured to execute the memory stored instructions, and when the processor executes the memory stored instructions, the performing step comprises: receiving The preamble portion of the communication signal of the user equipment performs preamble detection; wherein the communication signal includes a preamble portion and a data portion; the preamble portion includes an orthogonal code; and the data portion is generated by applying a spreading code on the original data symbol; Corresponding data is received by the correspondence between the preamble portion and the data portion.
  • the receiver provided by the embodiment of the present disclosure adopts a compact structure in which the preamble portion and the data portion are adjacently arranged, so that the base station can complete the process of user equipment discovery and data reception in one time, thereby eliminating multiple access message interactions and effectively improving. Communication efficiency.
  • the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment
  • the data part adopts the multiple access technology of the spreading code, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment.
  • performing preamble detection on the preamble portion of the received communication signal includes: at least partially eliminating interference in the preamble portion according to the orthogonal code in the preamble portion; performing at least one of the following on the preamble portion Item operations: user equipment discovery, frequency offset estimation, time offset estimation, noise estimation, and channel estimation.
  • the correspondence between the preamble portion and the data portion includes: a mapping relationship between a preamble resource of the preamble portion and the spreading code, and a preamble portion occupying a frequency band and the data portion occupying a frequency band Correspondence between them.
  • the performing, according to the correspondence between the preamble portion and the data portion performing corresponding data reception, according to: a correspondence between a frequency band occupied by the preamble portion and a frequency band occupied by the data portion, Obtaining a channel estimate for the data portion of the channel portion of the preamble portion; a one-to-one or many-to-one mapping relationship between the preamble resource of the preamble portion and a spreading code of the data portion, known by the preamble detection
  • the preamble resource determines a spreading code of the data part; and performs corresponding data reception on all detected user equipments according to the channel estimation of the data part and the spreading code.
  • the transmitter and the receiver adopt a compact structure in which the preamble portion and the data portion are adjacently arranged, so that the base station can complete the process of user equipment discovery and data reception at one time, and avoid Going to multiple access message interactions effectively improves communication efficiency.
  • the preamble part contains the orthogonal code to suppress the interference of the multi-user equipment
  • the data part adopts the multiple access technology of the spreading code, so that the base station can support the concurrent user equipment data transmission, thereby effectively reducing the delay of the data transmission by the user equipment.

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Abstract

L'invention concerne un procédé et un système de conception de signal pour une communication OFDM, un émetteur et un récepteur, pour résoudre le problème dans l'état de la technique associé selon lequel la procédure d'accès aléatoire dans une communication OFDM comporte un surdébit de signalisation important et ne peut pas prendre en charge une communication de terminal à haute densité. Le procédé consiste à : diviser des racines d'une séquence ZC de préambule attribuée à une cellule cible en au moins deux groupes, et appliquer différents codes orthogonaux à chaque groupe de racines pour former un groupe de ressources de préambule; sélectionner une ressource de préambule correspondante à partir du groupe de ressources de préambule pour générer une partie de préambule d'un signal de communication d'un équipement utilisateur; générer une partie de données du signal de communication de l'équipement utilisateur par l'application d'un code étendu à des données de transmission pour réaliser un accès simultané multi-utilisateur; et combiner la partie de préambule et la partie de données en trames.
PCT/CN2017/113415 2017-01-11 2017-11-28 Procédé et système de conception de signal pour communication ofdm, émetteur et récepteur Ceased WO2018130017A1 (fr)

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