WO2006128385A1 - Procede d'estimation de canal a jeux de codes multiples dans un systeme cdma a decoupage de temps - Google Patents
Procede d'estimation de canal a jeux de codes multiples dans un systeme cdma a decoupage de temps Download PDFInfo
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- WO2006128385A1 WO2006128385A1 PCT/CN2006/001190 CN2006001190W WO2006128385A1 WO 2006128385 A1 WO2006128385 A1 WO 2006128385A1 CN 2006001190 W CN2006001190 W CN 2006001190W WO 2006128385 A1 WO2006128385 A1 WO 2006128385A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
-
- 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
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
-
- 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
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7107—Subtractive interference cancellation
Definitions
- the present invention relates to the field of mobile communications technologies, and in particular, to a multi-code channel estimation method for a slot code division multiple access system.
- the most striking feature of wireless mobile communications is the complexity and time-varying of their channels.
- the channel needs to be estimated and measured at the receiving end, and then the signal is coherently detected using the obtained channel response.
- channel estimation plays an important fundamental role in related subsystems such as physical layer measurement, smart antenna, fast control, handover, and radio resource management.
- a channel estimation code and a transmitted data portion are transmitted by time division multiplexing, and time slots are also synchronized between different cells.
- TD-SCDMA Time Division Synchronous CDMA, Time Division Multiplexing-Synchronous Code Division Multiple Access System, ie, 3GPP 1.28 Mcps TDD
- the burst signal structure of a service slot is as shown in Figure 1:
- the midamble (middle code, also referred to as channel estimation code) in the middle of the burst signal is used for channel estimation, and the data blocks on both sides are used to transmit service data.
- the method of channel estimation for slotted CDMA is called Steiner estimator. For details, see the literature B. Steiner, and PW Baier, "Low Cost Channel Estimation in the Uplink Receiver of CDMA Mobile Radio Systems," FRE QUENZE, 47 (1993) 11-12, the specific estimation process is as follows: Set for each use:
- the time width of the channel response is represented by the window length W, and the channel response vector is represented by the values on the W taps separated by chips.
- the length of the midamble response signal should be Lm+W-1.
- the response signal of the intermediate code received by the receiving end can be expressed as:
- nid Gh + n ( 3 ) where n is noise and interference, and h is the total channel response vector:
- the matrix G is a circular matrix
- the task of channel estimation is to obtain the estimated value by solving the equation (3) with the channel response h as the unknown. From the maximum likelihood criterion and some simplification can be obtained:
- the DFT(g) in the formula can be calculated offline in advance.
- This channel estimation algorithm obtains channel estimation results of multiple users belonging to one code set with a small computational cost, and suppresses interference between multiple user intermediate codes belonging to the same basic code.
- This channel estimation method is directed to a multi-user intermediate code belonging to a code set of the same basic code for channel estimation, that is, a single code set channel estimation method.
- the single code set channel estimation method treats signals other than the signal set signal superimposed at the same time as white Gaussian noise, the performance cannot be satisfied when the signal to interference noise is low.
- the communication signal of the neighboring cell user at the boundary with the local cell has strong interference to the local cell, and the signal of the same-frequency neighboring cell and the signal of the local cell are time-synchronized. That is, the interference of the intra-frequency neighboring cells received by the channel estimation code of the local cell is mainly from the response of the channel estimation code signal of other code sets synchronized with the own cell.
- the performance of the single-code set channel estimation method is degraded, which not only limits the improvement of the reception performance of the multi-antenna system, but also enables the shaping transmission, physical layer measurement, synchronization, power control, etc. of the multi-antenna system. Deterioration of performance of related subsystems. In this case, the single code set channel estimation method is difficult to meet the system's requirements for channel estimation performance.
- Chinese Patent Application 03100670.1 proposes a multi-code set channel estimation method for a slot code division multiple access system, which implements multi-code set joint channel estimation based on finite time position decision.
- a multi-code set channel estimation method for a slot code division multiple access system comprising the following steps:
- a multi-code set channel estimation method for a slot code division multiple access system comprising the following steps:
- C recovering an interference component caused by the maximum interference tap response to each code set signal
- D′ canceling, by the original channel estimation result and the copy channel estimation result, respectively, the maximum interference tap response to each code set signal
- the interference component caused, the channel estimation result of the net signal of each code set is obtained, and the maximum dry 4 especially tap is set to 0;
- step E' determining whether the predetermined number of iterations is reached, if yes, outputting a channel estimation result of the net signal of each code set, otherwise, using the channel estimation result of the net signal of each code set as a channel estimation result of the code set of the next processing , return to step B'.
- the step C and the step ⁇ respectively include:
- the mutual interference vector may be generated by a field calculation or obtained by looking up a table
- the channel estimation result of the net signal of each code set is obtained by using a complete cancellation mode or a partial cancellation manner for the received signal, and a channel estimation result of the net signal of each code set is obtained by using a partial cancellation manner on the received signal,
- the offset ratio can be gradually increased with the number of iterations.
- the channel estimation result of each code set after a predetermined number of iterations may be directly used as a channel estimation result of the net signal of each code set; or the maximum retained by each iteration.
- the interference taps form a channel estimation result of the net signals of each code set.
- the calculating process of the mutual interference vector is specifically:
- CR 3 ⁇ 4 ⁇ m ⁇ ml
- g m is the base code of the mth code set
- P is a column vector of length P, whose i-th element is 1 and the remaining elements are 0
- between the DFTs on the numerator Point multiplication; the denominator and the numerator are points division.
- the present invention is directed to the case where there is a multi-code set channel estimation code response signal, which fully utilizes the information provided by the multi-code set signal, and cancels the main interference between the multi-code set signals. Improved channel estimation performance.
- the present invention directly performs the iterative operation of interference recovery and interference cancellation in the result of single code set channel estimation, which greatly reduces the computational complexity and realizes high performance multi-code set channel estimation at a small cost.
- the invention can be used not only to improve the performance of channel estimation of a single code set, but also to obtain channel estimation results of multiple code sets at the same time, thereby ensuring the normal operation of the same-frequency adjacent cells in the time slot CDMA system.
- Various techniques related to smart antenna applications, radio resource management, physical layer measurements, and slot CDMA system extensions provide the basis for channel and interference measurements.
- FIG. 1 is a schematic diagram of a burst structure of a TD-SCDMA service slot
- Figure 3 is a flow chart showing another implementation of the method of the present invention.
- 4 is a schematic diagram of a signal processing procedure of multi-code set channel estimation according to an embodiment of the present invention.
- the core of the present invention is to extract a maximum interference tap from a single code set channel estimation result, thereby directly recovering other code set interference signals, and canceling the interference signal to obtain a net signal of each code set, and then each code The net signal of the set repeats the above processing until the predetermined number of iterations is reached, and the channel estimation result is output.
- the response Due to the interference of the intra-frequency neighboring cells received by the intermediate code of the cell, the response mainly comes from the intermediate code signal of other code sets synchronized with the cell.
- the received signal of the intermediate code is referred to as a multi-code set channel estimation code response signal.
- the cartridge is hereinafter referred to as a multi-code set signal.
- the presence of a multi-code set signal not only provides the possibility of obtaining multiple code set channel estimates at the same time, but also provides the possibility of improving the performance of the single code set channel estimation.
- the invention optimizes multi-code set channel estimation in the prior art, extracts the maximum interference tap from the single code set channel estimation result, directly performs the iterative operation of interference recovery and interference cancellation, and realizes high performance at a small cost. Code set channel estimation.
- the implementation process of the method of the present invention is as shown in FIG. 2, and includes the following steps:
- Step 201 Initialize:
- the input of each single code set channel estimator is set equal to the total multi code set reception signal before channel estimation.
- Step 202 Single code set channel estimation:
- channel estimation of a single code set is performed separately for different code sets, and original channel estimation results of each code set are obtained.
- Step 203 Extract the maximum tap processing: First, the tap having the largest peak power among the channel estimation results of each code set is obtained, and then the code set "1 of the maximum peak power tap, the corresponding tap position! 1, and the maximum power tap block 204: the interference is restored:
- CRi ' is the mutual interference vector of the channel estimate for the mth code set generated by the unit response of the ilth tap of the mlth code set. Its calculation formula is as follows:
- g m is the basic code of the mth code set; is a length of
- CR!r' 0 can be used on-site calculation or in advance to calculate the stored look-up table.
- Step 205 Interference cancellation:
- the interference component caused by the recovered other code set signal response is subtracted from the total received signal, and a relatively clean signal is obtained for each code set, that is, the interference obtained above is offset from the channel estimation result:
- Step 206 Determine whether the predetermined number of iterations is reached.
- step 207 Output the result: The result may be 3 ⁇ 4 after a plurality of iterations, m is the number of cells; it may also be the maximum power tap '," selected in each iteration in step 203, which constitutes the required channel estimation result for each cell.
- step 203 If the number of iterations is not reached, then returning to step 203, the interference cancellation result obtained in step 205, i.e., the signal obtained after the last iteration, which is relatively clean for each code set, continues to be iteratively processed.
- the following two schemes can be used for processing the multi-code set signal:
- One solution is to still treat signals of different code sets as completely strictly synchronized signals, using channel-like data at the same sample point for channel estimation, interference recovery, and interference cancellation. Only when the final result of the channel estimation is applied, the shift of the correspondence between the channel estimation and the code channel caused by the time deviation is considered.
- Another solution is to perform signal processing according to the respective synchronization times of different code sets, and use different time offsets for different code sets for channel estimation, interference recovery and interference cancellation.
- the interference cancellation is only the non-this code set interference component in which different code sets overlap in time.
- the channel estimation result at this time can be directly applied.
- the original channel estimation result may also be saved in two parts: one of which participates in the maximum interference tap selection, the interference recovery, and the interference tap cancellation processing, and sets the maximum interference tap to 0 after the cancellation, but the channel estimation result
- the output does not take the number of iterations; the other does not participate in the maximum interference tap selection, interference recovery processing, only participates in the interference cancellation processing, and can be used as the output after reaching the number of iterations.
- Step 301 Initialization:
- the input of each single code set channel estimator is set equal to the total multi code set reception signal before channel estimation.
- Step 302 Single code set channel estimation:
- Step 303 Select a maximum interference tap from the original channel estimation result:
- the tap with the largest peak power in the original channel estimation result is obtained, and then the code set '"1 of the maximum peak power tap, the corresponding tap position l, and the maximum power tap ⁇ mU l are recorded.
- Step 304 Restore interference:
- the maximum power taps in the code set channel estimation results obtained above are used to recover the interference components caused by the signal responses of the respective code sets, that is, the channel estimation results for the other code sets are calculated by using the maximum power taps i, 'i obtained above. Interference: ; m ⁇ m ⁇ .
- Step 305 Offset the interference component caused by the maximum interference tap response to each code set signal from the original channel estimation result and the replica channel estimation result respectively, obtain channel estimation results of the net signals of each code set, and set the maximum interference tap to zero.
- full interference cancellation may be employed, or partial interference cancellation may be employed.
- Step 306 Determine whether the predetermined number of iterations is reached.
- step 307 Output the result:
- m is the number of cells; it may also be the maximum power tap selected in each iteration in step 303, which constitutes the required channel estimation result for each cell.
- step 303 If the number of iterations is not reached, then returning to step 303, the interference cancellation result obtained in step 305, that is, the signal obtained after the last iteration, which is relatively clean for each code set, continues to be iteratively processed.
- the channel estimation method will be described below by taking the received signals of three different code sets as an example.
- the intermediate code signals belonging to the three code sets of the three cells have the strongest response, and the cyclic matrices corresponding to the three code sets are respectively Gl, G2, and G3, channel response vectors are hl, h2, and h3, respectively.
- the received signal can be expressed as:
- n 0 in the above formula is different from n in the formula (3), and n 0 represents all noise except the three multi-code set signals. Taking into account the cost of the algorithm, as well as the results of the simulation and actual experiments to determine the number of iterations and the number of code sets. In this embodiment, the number of iterations is set to 6.
- Step 1 Before starting channel estimation, set the input of each single code set channel estimator to be equal to the total multicode set received signal:
- Step 2 Single code set channel estimation: Using the single code set channel estimation method, channel estimation of a single code set is performed separately for different code sets, and the original channel estimation results of each code set are obtained according to formula (6):
- the taps having the maximum peak power among the original channel estimation results of the above three code sets are obtained by the sorting method, and the code set having the largest peak power tap is recorded as "71, the corresponding tap position il, and the maximum power tap h '";
- CR " 2 be the mutual interference vector of the channel estimate of the mth code set generated by the unit response of the mth code set of the i-th chip.
- C ml ' m2) can be calculated on site or calculated in advance. use.
- the channel estimation result of each cell is also possible to construct the channel estimation result of each cell to be output by ⁇ , ' ⁇ ' selected in each iteration.
- Step 1 Initialization: Before starting channel estimation, set the input of each single code set channel estimator to be equal to the total multi-code set received signal:
- Step 2' single code set channel estimation:
- Step 3' find the maximum peak:
- Step 5' interference cancellation:
- the channel estimation results of the three code sets are selected twice in the iterative process, that is, the first and second taps of the first code set h , the second The first and second taps of the code set, h , the first and second taps of the third code set,
- the total received signals e '" « are input to the respective single code set estimators respectively, and the original channel estimation results of the respective code sets are obtained, and the results are sequentially selected by the maximum tap, the maximum tap interference recovery, and the interference.
- the net signal h of each code set is obtained; ".
- each code The net signal is used as the channel estimation result of each code set, and the above-mentioned maximum tap selection, maximum tap interference recovery, and interference cancellation processing are repeated until the predetermined number of iterations is reached.
- the result after multiple iterations is used as the channel estimation result of each code set, or the maximum power tap selected in each iteration constitutes the channel estimation result of each cell.
- the multi-code set channel estimation of the present invention directly performs an iterative process of interference recovery and interference cancellation in the channel estimation result, which greatly reduces the complexity of the iterative process implementation, and realizes a high-performance multi-code set channel with a small cost. estimate.
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KR1020077030618A KR100909519B1 (ko) | 2005-06-03 | 2006-06-02 | 타임-슬롯 cdma 시스템에서의 다중-코드-셋 채널 추정 방법 |
EP06742077.8A EP1892869B1 (en) | 2005-06-03 | 2006-06-02 | A multiple code-set channel estimation method in time-slot cdma system |
JP2008513904A JP4724225B2 (ja) | 2005-06-03 | 2006-06-02 | タイムスロットcdmaシステムにおける多コード集合通信路推定方法 |
US11/916,186 US7697569B2 (en) | 2005-06-03 | 2006-06-02 | Multi-code-set channel estimation method in a time-slot CDMA system |
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CNB2005100752057A CN100499607C (zh) | 2005-06-03 | 2005-06-03 | 时隙码分多址系统多码集信号估计方法 |
CN200510075205.7 | 2005-06-03 |
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CN106231624A (zh) * | 2016-08-31 | 2016-12-14 | 重庆大学 | 用于通信系统的信号检测方法和装置 |
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CN100499607C (zh) * | 2005-06-03 | 2009-06-10 | 上海原动力通信科技有限公司 | 时隙码分多址系统多码集信号估计方法 |
CN101335544B (zh) * | 2007-06-26 | 2012-12-05 | 中兴通讯股份有限公司 | 一种基于训练序列的信道估计方法和系统 |
CN101541012A (zh) * | 2008-03-21 | 2009-09-23 | 夏普株式会社 | 干扰过载指示生成方法、干扰过载指示触发方法、干扰过载指示方法和基站 |
CN102271103B (zh) * | 2011-02-18 | 2014-06-11 | 北京大学 | 一种td-scdma系统中的多小区信道估计方法 |
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CN1588931A (zh) * | 2004-09-02 | 2005-03-02 | 上海交通大学 | 基于迭代干扰消减的信道估计方法 |
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JP4378036B2 (ja) | 2000-07-17 | 2009-12-02 | オーデリック株式会社 | 照明装置 |
CN100409588C (zh) * | 2005-06-03 | 2008-08-06 | 上海原动力通信科技有限公司 | 时隙码分多址系统多小区联合检测方法 |
CN100499607C (zh) * | 2005-06-03 | 2009-06-10 | 上海原动力通信科技有限公司 | 时隙码分多址系统多码集信号估计方法 |
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EP0952711A2 (en) * | 1998-04-23 | 1999-10-27 | Lucent Technologies Inc. | Joint maximum likelihood sequence estimator with dynamic channel description |
JP2002330113A (ja) * | 2001-02-28 | 2002-11-15 | Mitsubishi Electric Research Laboratories Inc | Ofdmシステムのための反復最大尤度チャンネル推定及び信号検出システム及び方法 |
CN1520077A (zh) * | 2003-01-21 | 2004-08-11 | 大唐移动通信设备有限公司 | 时隙码分多址系统多码集信道估计方法 |
CN1588931A (zh) * | 2004-09-02 | 2005-03-02 | 上海交通大学 | 基于迭代干扰消减的信道估计方法 |
Cited By (2)
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CN106231624A (zh) * | 2016-08-31 | 2016-12-14 | 重庆大学 | 用于通信系统的信号检测方法和装置 |
CN106231624B (zh) * | 2016-08-31 | 2019-08-09 | 重庆大学 | 用于通信系统的信号检测方法和装置 |
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EP1892869A4 (en) | 2013-08-14 |
US7697569B2 (en) | 2010-04-13 |
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EP1892869A1 (en) | 2008-02-27 |
CN1874329A (zh) | 2006-12-06 |
KR100909519B1 (ko) | 2009-07-27 |
CN100499607C (zh) | 2009-06-10 |
KR20080016690A (ko) | 2008-02-21 |
EP1892869B1 (en) | 2020-01-15 |
US20080310455A1 (en) | 2008-12-18 |
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