CN110166105A - Uplink detection algorithm suitable for LTE wireless signal acquiring and analysis system - Google Patents
Uplink detection algorithm suitable for LTE wireless signal acquiring and analysis system Download PDFInfo
- Publication number
- CN110166105A CN110166105A CN201910139902.6A CN201910139902A CN110166105A CN 110166105 A CN110166105 A CN 110166105A CN 201910139902 A CN201910139902 A CN 201910139902A CN 110166105 A CN110166105 A CN 110166105A
- Authority
- CN
- China
- Prior art keywords
- mmse
- wireless signal
- analysis system
- lte wireless
- signal acquiring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
-
- 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
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/06—Testing, supervising or monitoring using simulated traffic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03821—Inter-carrier interference cancellation [ICI]
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Discrete Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention discloses a kind of uplink detection algorithm suitable for LTE wireless signal acquiring and analysis system, comprising: the uplink receiving end of LTE wireless signal acquiring and analysis system first；Then the discrete time-domain complex signal sequence of the output of Receiver Module corresponding to two receiving antennas is made to remove CP processing respectively；Then gained time domain sequences are sent into FFT module, do the transformation of N point quick Fourier；The output of the module is finally subjected to subcarrier demapping, obtains input of the frequency domain data of two groups of M points as MIMO processing unit respectively；MIMO processing unit determines different critical co-channel interference performance number according to the height of channel relevancy, and according to variation of the co-channel interference power near critical value, MIMO processing unit will carry out dynamic pattern switching between MMSE and MMSE-SIC algorithm.Method of the invention has the characteristics that switching at runtime detection algorithm, and preferable BER performance can be realized under different interference strengths.
Description
Technical field
The present invention relates to wireless communication receiver technical fields, and in particular to one kind be suitable for LTE wireless signal acquiring with
The uplink detection algorithm of analysis system.
Background technique
With the high speed development of mobile communication technology, 2G/3G mobile phone user mostly fast transferring is 4G user, for safety
The wireless signal acquiring in field is also faced with analysis system equipment from supporting 2G/3G standard to change to the full moulded-on type upgrading of support 4G
Generation.Passive type LTE wireless signal acquiring is acquired with analysis system by downlink signal and analytical equipment arrives mobile phone to LTE base station
Wireless signal carries out real-time monitoring, obtains necessary network communication parameters and communication process information；And relevant information is configured to
In up-link wireless signal collection and analysis equipment, the wireless signal of target mobile phones to base station is measured, to fast implement
The physical location of target mobile phones is accurately positioned.
LTE wireless signal acquiring and analysis system need to realize target mobile phones uplink when positioning to target mobile phones
The correct detection of signal.However the uplink of passive type LTE wireless signal acquiring and analysis system is detected, target user's
Mobile phone is now netted the management and control of base station by LTE, LTE wireless signal acquiring and analysis system cannot as base station that LTE is now netted that
Sample carries out effective interference coordination, and uplink detection is likely encountered more co-channel interferences, reduces detection performance.Due to LTE without
Line signal collection and analysis system equipment now nets that the position of base station is different from LTE, when the mobile phone quilt of target mobile phones and other users
System distributes its identical running time-frequency resource when configuration realizes SDMA using MU-MIMO or BF, and LTE wireless signal acquiring and analysis are
System equipment will encounter co-channel interference when detecting the uplink signal of target mobile phones: when target user is compared with other users distance LTE
When the position of wireless signal acquiring and analysis system equipment is farther, co-channel interference is with regard to serious！Conversely, co-channel interference is just relatively light.When
There are when co-channel interference, MMSE is just exposed as a kind of the drawbacks of diversity reception scheme.MMSE can not play interference
It is acted on to any elimination, with the increase of co-channel interference, the BER performance of MMSE will also deteriorate rapidly.MMSE-SIC is as one
Kind interference cancellation scheme, can effectively eliminate co-channel interference, improve BER performance.But when co-channel interference is smaller, MMSE-
The BER performance of SIC is not as good as MMSE, because the latter can obtain the gain that multiple antennas receives diversity.As it can be seen that MMSE scheme is low
The case where performance is more excellent when co-channel interference, and MMSE-SIC is then suitable for high interference.
Summary of the invention
The present invention proposes a kind of uplink detection algorithm suitable for LTE wireless signal acquiring and analysis system, it is therefore intended that
According to the size of co-channel interference, dynamic pattern switching is carried out in both detection algorithms of MMSE and MMSE-SIC, can be obtained
Obtain better BER performance.
To realize above-mentioned technical purpose and the technique effect, the present invention includes the following steps,
The uplink receiving end of S1:LTE wireless signal acquiring and analysis system；
S2: removal CP is made respectively to the discrete time-domain complex signal sequence of the output of Receiver Module corresponding to two receiving antennas
Processing；
S3: gained time domain sequences are sent into FFT module, do the transformation of N point quick Fourier；
S4: carrying out subcarrier demapping for the output of the module, and the frequency domain data for obtaining two groups of M points respectively is single as MIMO processing
The input of member；
S5:MIMO processing unit determines different critical co-channel interference performance number according to the height of channel relevancy；It is dry according to same frequency
Variation of the power near critical value is disturbed, MIMO processing unit will carry out dynamic mode between MMSE and MMSE-SIC algorithm
Switching.
Further, in the step S5, co-channel interference refers to the mobile phone and other users of the target user in LTE is now netted
Mobile phone when being configured to realize SDMA using MU-MIM or BF system distribute its identical running time-frequency resource, the mobile phone pair of other users
The interference that target mobile phones generate.
Further, in the step S5, MMSE algorithm be by the target mobile phones of single antenna, it is wireless with the LTE of double antenna
The uplink receiving end of signal collection and analysis system constitutes the reception diversity system of 1 × 2 antenna, and signal detection meets lowest mean square
Error MMSE criterion.
Further, in the step S5, MMSE-SIC algorithm is by the target mobile phones of single antenna and to generate co-channel interference
Other users mobile phone, constitute 2 × 2 antennas with the uplink receiving end of the LTE wireless signal acquiring of double antenna and analysis system
Virtual MIMO system, implement interference eliminate；Wherein, for the mobile phone signal of other users as interference, the signal of target mobile phones is logical
The method for crossing MMSE counteracting serial interference is detected.
Further, in the step S5, if co-channel interference power is less than the critical value, MIMO processing unit is taken suddenly
The slightly this interference from other users mobile phone, and the strategy of MMSE algorithm is used for the data of target mobile phones；If dry with frequency
Power is disturbed greater than the critical value, then MIMO processing unit is using MMSE-SIC algorithm to carrying out interference elimination.
Beneficial effect
Uplink detection algorithm of the present invention suitable for LTE wireless signal acquiring and analysis system, according to from it
The size of the co-channel interference of his user mobile phone is implemented dynamic mode between both detection algorithms of MMSE and MMSE-SIC and is cut
It changes.Have the characteristics that switching at runtime detection algorithm, preferable BER performance can be realized under different interference strengths.
Detailed description of the invention
Fig. 1 is LTE wireless signal acquiring and analysis system extended receiver end structure block diagram；
Fig. 2 is the bit error rate curve of MMSE and MMSE-SIC under low channel relevancy；
Fig. 3 is the bit error rate curve of MMSE and MMSE-SIC under middle channel relevancy；
Fig. 4 is the bit error rate curve of MMSE and MMSE-SIC under high channel correlation；
Specific embodiment
With reference to the accompanying drawing, most preferred embodiment is described in detail, but protection scope of the present invention is not limited to institute
State embodiment.
As shown in Figure 1, the invention mainly includes steps:: the uplink of LTE wireless signal acquiring and analysis system first
Receiving end；Then the discrete time-domain complex signal sequence of the output of Receiver Module corresponding to two receiving antennas is gone respectively
Except CP processing；Then gained time domain sequences are sent into FFT module, do the transformation of N point quick Fourier；Finally by the output of the module
Subcarrier demapping is carried out, obtains input of the frequency domain data of two groups of M points as MIMO processing unit respectively；Wherein, at MIMO
Unit is managed according to the height of channel relevancy, different critical co-channel interference performance number is determined, according to co-channel interference power critical
Variation near value, MIMO processing unit will carry out dynamic pattern switching between MMSE and MMSE-SIC algorithm.
There are two mobile device in the simulating scenes of the embodiment of the present invention, i.e. target mobile phones and interference handset and one
LTE wireless signal acquiring and analysis system equipment.LTE wireless signal acquiring and analysis system equipment want the uplink of target mobile phones to believe
Number correct detection；And interference handset is other for using MU-MIMO and/or BF realization SDMA in existing net with the mobile phone of target user
The mobile phone of user shares on identical running time-frequency resource with target mobile phones, generates co-channel interference to target mobile phones.In view of LTE without
The sphere of action 1000m of line signal collection and analysis system, target mobile phones and interference handset in simulating scenes are both configured to 1m/
The low mobility state of s.
LTE system bandwidth is 20MHz in emulation, and subcarrier spacing 15kHz, each resource block includes 12 on frequency domain
Subcarrier, therefore target mobile phones can at most be assigned to 110 resource blocks, i.e. 1320 subcarriers.Subcarrier maps mode is to concentrate
Formula contains 7 SC-FDMA symbols using conventional CP in each time slot.IFFT point number after corresponding subcarrier maps is then arranged
It is 2048 points, sample frequency 30.72MHz.Channel model uses 7 diameter EPA models, and maximum doppler frequency is set asf d = v*f c / c=6.67Hz, wherein carrier frequencyf c It is set as 2GHz, light velocity c is 3 × 108M/s, movement speedvFor 1m/s.Channel estimation
Mode setting is perfect channel estimation, and coding mode is the Turbo code of 1/3 code rate, and constellation modulation system then uses QPSK to modulate.
Emulation is divided into three kinds of low channel relevancy, middle channel relevancy and high channel correlation different scenes.Channel
Degree of correlation is mainly determined by antenna spacing and antenna polarization angle the two parameters.Under low correlation scene, between transmitting antenna
10 times of wavelength are much larger than away from (i.e. target mobile phones antenna is at a distance from interference handset antenna), polarisation angles are (0 °, 0 °)；Middle correlation
Property scene under, transmitting antenna spacing be 10 times of wavelength, polarisation angles be (0 °, 0 °)；Under high associated scenario, transmitting antenna spacing is
Half-wavelength, polarisation angles are (0 °, 0 °)；Wherein, wavelengthλ = c/f c = 0.15m.Receiving antenna be polarisation angles (- 45 °,
45 °) dual polarized antenna.It is basic, normal, high by three in order to obtain preferably BER performance under different signal interference ratios according to Fig. 3 ~ Fig. 4
The critical jamming power of interference handset is respectively set to -13dB, -12dB, -6dB under kind channel relevancy scene, wherein target hand
Machine signal power is set as 0dB.LTE wireless signal acquiring and analysis system pass through first when carrying out uplink detection target user and
Interfere the signal power of uplink channel detection reference signal (SRS) the measurement target mobile phones of user and the interference of interference handset
Power, when co-channel interference power is less than critical jamming power, receiver uses MMSE scheme, when co-channel interference jamming power is big
When critical jamming power, receiver is switched to MMSE-SIC scheme.According to the variation of co-channel interference performance number, receiver exists
Dynamic mode switching is executed between MMSE and MMSE-SIC algorithm, improves BER performance.
Those skilled in the art scholar will be understood that, can although specific embodiment has been described for the ease of explaining here
Various changes are made without departing from the spirit and scope of the invention.Therefore, except as by the appended claims, Bu Nengyong
In the limitation present invention.
Claims (5)
1. a kind of uplink detection algorithm suitable for LTE wireless signal acquiring and analysis system, it is characterised in that: including walking as follows
Suddenly,
The uplink receiving end of S1:LTE wireless signal acquiring and analysis system；
S2: removal CP is made respectively to the discrete time-domain complex signal sequence of the output of Receiver Module corresponding to two receiving antennas
Processing；
S3: gained time domain sequences are sent into FFT module, do the transformation of N point quick Fourier；
S4: carrying out subcarrier demapping for the output of the module, and the frequency domain data for obtaining two groups of M points respectively is single as MIMO processing
The input of member；
S5:MIMO processing unit determines different critical co-channel interference performance number according to the height of channel relevancy；It is dry according to same frequency
Variation of the power near critical value is disturbed, MIMO processing unit will carry out dynamic mode between MMSE and MMSE-SIC algorithm
Switching.
2. the uplink detection algorithm according to claim 1 suitable for LTE wireless signal acquiring and analysis system, feature
Be: in the step S5, co-channel interference refers to that the mobile phone of target user and the mobile phone of other users are configured in LTE is now netted
System distributes its identical running time-frequency resource when realizing SDMA using MU-MIM or BF, and the mobile phone of other users generates target mobile phones
Interference.
3. the uplink detection algorithm according to claim 1 suitable for LTE wireless signal acquiring and analysis system, feature
Be: in the step S5, MMSE algorithm be by the target mobile phones of single antenna, with the LTE wireless signal acquiring of double antenna with point
The uplink receiving end of analysis system constitutes the reception diversity system of 1 × 2 antenna, and it is quasi- that signal detection meets least mean-square error MMSE
Then.
4. the uplink detection algorithm according to claim 1 suitable for LTE wireless signal acquiring and analysis system, feature
Be: in the step S5, MMSE-SIC algorithm is by the other users of the target mobile phones of single antenna and generation co-channel interference
Mobile phone constitutes the virtual MIMO system of 2 × 2 antennas with the LTE wireless signal acquiring of double antenna and the uplink receiving end of analysis system
System is implemented interference and is eliminated；Wherein, the mobile phone signal of other users is serially done as interference, the signal of target mobile phones by MMSE
The method for disturbing counteracting is detected.
5. the uplink detection algorithm according to claim 1 suitable for LTE wireless signal acquiring and analysis system, feature
Be: in the step S5, if co-channel interference power be less than the critical value, MIMO processing unit take ignore it is this from its
The interference of his user mobile phone, and the strategy of MMSE algorithm is used for the data of target mobile phones；It should if co-channel interference power is greater than
Critical value, then MIMO processing unit is using MMSE-SIC algorithm to carrying out interference elimination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910139902.6A CN110166105A (en) | 2019-02-26 | 2019-02-26 | Uplink detection algorithm suitable for LTE wireless signal acquiring and analysis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910139902.6A CN110166105A (en) | 2019-02-26 | 2019-02-26 | Uplink detection algorithm suitable for LTE wireless signal acquiring and analysis system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110166105A true CN110166105A (en) | 2019-08-23 |
Family
ID=67645398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910139902.6A Pending CN110166105A (en) | 2019-02-26 | 2019-02-26 | Uplink detection algorithm suitable for LTE wireless signal acquiring and analysis system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110166105A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1731701A (en) * | 2005-08-26 | 2006-02-08 | 电子科技大学 | Multi-antenna communication method and communication system adaptively adjusted according to channel spatial correlation |
| CN102739299A (en) * | 2012-06-28 | 2012-10-17 | 东南大学 | Switching method of uplink receiving scheme mode for long term evolution home eNodeB |
| US20160344459A1 (en) * | 2015-05-22 | 2016-11-24 | ZTE Canada Inc. | Adaptive mimo signal demodulation using determinant of covariance matrix |
| WO2017116292A1 (en) * | 2015-12-29 | 2017-07-06 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and receiving node for detecting signals transmitted by multiple users |
| CN107809299A (en) * | 2017-10-23 | 2018-03-16 | 哈尔滨工业大学 | After the first string of multiple users share access technology up-link and multi-user test method |
-
2019
- 2019-02-26 CN CN201910139902.6A patent/CN110166105A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1731701A (en) * | 2005-08-26 | 2006-02-08 | 电子科技大学 | Multi-antenna communication method and communication system adaptively adjusted according to channel spatial correlation |
| CN102739299A (en) * | 2012-06-28 | 2012-10-17 | 东南大学 | Switching method of uplink receiving scheme mode for long term evolution home eNodeB |
| US20160344459A1 (en) * | 2015-05-22 | 2016-11-24 | ZTE Canada Inc. | Adaptive mimo signal demodulation using determinant of covariance matrix |
| WO2017116292A1 (en) * | 2015-12-29 | 2017-07-06 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and receiving node for detecting signals transmitted by multiple users |
| CN107809299A (en) * | 2017-10-23 | 2018-03-16 | 哈尔滨工业大学 | After the first string of multiple users share access technology up-link and multi-user test method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9867060B2 (en) | Radio communication system and antenna configuration determination method | |
| Obara et al. | Joint fixed beamforming and eigenmode precoding for super high bit rate massive MIMO systems using higher frequency bands | |
| Obara et al. | Joint processing of analog fixed beamforming and CSI-based precoding for super high bit rate massive MIMO transmission using higher frequency bands | |
| KR102508858B1 (en) | Method and Apparatus for Transmitting Diversity | |
| Bora et al. | IRS-assisted high mobility communications using OTFS modulation | |
| Suyama et al. | Evaluation of 30 Gbps super high bit rate mobile communications using channel data in 11 GHz band 24× 24 MIMO experiment | |
| CN115706691B (en) | Data transmission processing method, device, communication equipment and storage medium | |
| US8731461B2 (en) | Repeater for MIMO signals in a network | |
| WO2015147814A1 (en) | Radio frequency beamforming basis function feedback | |
| WO2018059112A1 (en) | Antenna beam management method and related device | |
| CN107332800A (en) | Modulate accurate wireless transmission scheme in a kind of direction selected based on random sub carrier wave | |
| Zhou et al. | Fast codebook-based beamforming training for mmWave MIMO systems with subarray structures | |
| CN101882952A (en) | Spatial Division Multiple Access Transmission Method for Statistical Eigenpatterns | |
| CN116805917A (en) | Channel estimation method and wireless sensing equipment | |
| WO2022199664A1 (en) | Information sending method and device | |
| Okuyama et al. | Antenna deployment for 5G ultra high-density distributed antenna system at low SHF bands | |
| Okuyama et al. | Antenna deployment of 5G ultra high-density distributed Massive MIMO by low-SHF-band indoor and outdoor experiments | |
| Tian et al. | MIMO CSI-based super-resolution AoA estimation for Wi-Fi indoor localization | |
| Zohra et al. | Performance Evaluation of a Broadband MIMO-CP-OFDM Communication System in the context of 5G-and-Beyond-3GPP defined Fading Channels | |
| Zhou et al. | Affine frequency division multiplexing for communication and channel sounding: Requirements, challenges, and key technologies | |
| US9537547B1 (en) | User equipment SRS selection with network node intelligence for beamforming performance improvement | |
| CN110166105A (en) | Uplink detection algorithm suitable for LTE wireless signal acquiring and analysis system | |
| CN102447658B (en) | Method and device for suppressing and merging interference | |
| Mhiri et al. | Synchronization for a DVB-T receiver in presence of cochannel interference | |
| Li et al. | Angular information extraction algorithm of 5G-NR uplink wireless channel based on SRS |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190823 |
|
| RJ01 | Rejection of invention patent application after publication |