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WO2011160340A1 - Td-scdma系统中进行同频测量的方法及装置 - Google Patents

Td-scdma系统中进行同频测量的方法及装置 Download PDF

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Publication number
WO2011160340A1
WO2011160340A1 PCT/CN2010/076894 CN2010076894W WO2011160340A1 WO 2011160340 A1 WO2011160340 A1 WO 2011160340A1 CN 2010076894 W CN2010076894 W CN 2010076894W WO 2011160340 A1 WO2011160340 A1 WO 2011160340A1
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Prior art keywords
cell
channel estimation
value
processing
channel
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PCT/CN2010/076894
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English (en)
French (fr)
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梁立宏
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中兴通讯股份有限公司
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Publication of WO2011160340A1 publication Critical patent/WO2011160340A1/zh

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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
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7107—Subtractive interference cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H04B17/327—Received signal code power [RSCP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • 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

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a method and apparatus for performing intra-frequency measurement in a TD-SCDMA (Time Division Synchronous Code Division Multiple Access) system.
  • TD-SCDMA Time Division Synchronous Code Division Multiple Access
  • the TD-SCDMA system uses the same-frequency networking technology as an effective solution, but the same-frequency networking technology also brings about the same-frequency interference problem while improving the spectrum utilization rate.
  • Co-channel interference is the signal interference between different cells caused by neighboring co-frequency cells using the same carrier frequency for data transmission. The same-frequency interference will degrade system performance.
  • the cell reselection means that the UE (User Equipment) selects a best cell to provide services by monitoring the signal quality of the local cell and the neighboring cell at any time in the idle mode; the cell handover refers to when the UE moves from a cell to a cell.
  • channel switching is required in order to keep the UE's communication uninterrupted.
  • the value of the received signal code (RSCP) on the PCCPCH is used to identify the strength of the cell signal, and the reselection or handover performance between the same frequency cells.
  • the measured value of PCCPCH-RSCP is calculated by using the channel estimation tap value in the first channel window of the channel estimation value on the midamble code (training sequence code) in the TS0 slot.
  • single-cell channel estimation is usually done using the classical Steiner channel estimator, which is a low-cost channel estimation method.
  • the basic principle is: The basic midamble code constructs the midamble code of each cell according to a certain rule, so that the matrix of the midamble code system at the receiving end has cyclic correlation, and passes FFT (Fast Fourier Transform) and IFFT (Inverse Fast Fourier). Transform, Inverse Fast Fourier Transform) calculates the channel estimates quickly.
  • the specific calculation process is as follows: The Steiner channel estimator performs frequency domain calculation first, and then obtains the time domain channel estimation value through the IFFT inverse transform. Finally, the channel estimation result is removed by channel estimation and the channel estimation result is obtained.
  • the joint channel estimation of multiple co-frequency cells generally adopts two structures: SIC (Successive Interference Cancellation) or PIC (Parallel Interference Cancellation).
  • the SIC generally uses a method of gradually subtracting the maximum user interference, and the SIC detector performs data decision on the received multiple user signals one by one, and then recreates one after the decision, and subtracts the user reconstructed signal according to the order of the signal power.
  • the signal with high power is operated first, so that the signal with the weakest power benefits the most, and the signal with the strongest power has the least benefit. Therefore, the detection performance of the SIC for the weak signal is better, and the detection performance for the strong signal is poor.
  • the reordering needs to be performed when the signal power changes.
  • the initial data decision is unreliable during the SIC processing, a large interference will be generated to the lower stage, thereby causing the performance of the subsequent stages to be degraded.
  • PIC generally uses the method of simultaneous decision, regeneration and cancellation for each stage. That is, the PIC constructs the interference signal of all users by using the information of the previous stage decision, and then cancels the interference signal from the received signal, and finally judges at the same time. Since PIC uses parallel processing of signal interference, there is no need to sort the processed signals, so PIC has poor detection capability for weak signals. When power control is not ideal, such as in multipath channels, PIC performance is worse than SIC. . Summary of the invention
  • the main object of the present invention is to provide a method and apparatus for performing on-frequency measurement in a TD-SCDMA system, which aims to solve the PCCPCH-RSCP value for a strong signal cell in the same-frequency multi-cell scenario in the prior art.
  • a method for performing on-frequency measurement in a time division synchronous code division multiple access (OFDM) TD-SCDMA system includes the following steps: receiving a multi-cell signal, and performing parallel interference cancellation PIC processing on each cell to obtain a first-level channel estimation of each cell a value; performing, according to the first-level channel estimation value of each cell, the PIC-processed cells, performing subsequent serial interference, and performing SIC processing on each cell to obtain channel estimation results of each cell; and acquiring the main cell according to the channel estimation result of each cell
  • the common control physical channel receives the signal code channel power PCCPCH-RSCP value.
  • the step of performing PIC processing on each cell to obtain a first-level channel estimation value of each cell specifically includes: performing Fast Fourier Transform FFT and Fast Fourier according to the received multi-cell signal and the basic training sequence midamble code of each cell Inverting the IFFT to obtain the original channel estimation of each cell; performing denoising on the original channel estimation values of each cell to obtain the first-level channel estimation values of each cell, and each channel estimation value has 128 channel estimation tap values.
  • the step of performing subsequent SIC processing on each PIC processed cell according to the first-level channel estimation value of each cell, and obtaining the channel estimation result of each cell specifically includes: 128 out of the first-level channel estimation values of each cell
  • the channel estimation tap value is used for energy accumulation to obtain a first energy accumulation value; each cell is sorted according to the first energy accumulation value from large to small; and the sorted cells are sequentially subjected to SIC processing to obtain channel estimation values of each cell at the current level.
  • the 128 channel estimation tap difference values are used for energy accumulation to obtain a second energy accumulation value; each cell is sorted according to the second energy accumulation value from small to large; when the second energy accumulation value of each cell is smaller than the preset
  • the threshold or interference cancellation reaches a predetermined number of levels, the SIC processing flow is exited, and the channel estimation value of each cell is the channel estimation result of each cell; otherwise, the interference is eliminated for each of the sorted cells.
  • the step of sequentially performing the SIC processing on each of the sorted cells to obtain the channel estimation value of each cell of the cell includes: reconstructing each of the cells other than the current processing cell according to the basic midamble code of each cell and the latest channel estimation value. a cell signal; performing SIC processing according to the reconstructed signal to obtain an interference cancellation result; calculating an initial channel estimation value of the currently processed cell according to the interference cancellation result and the basic midamble code of the currently processed cell; and initial channel estimation for the currently processed cell
  • the value is denoised to obtain the current channel estimation value of the currently processed cell.
  • the above steps are repeated, and each cell is sequentially subjected to SIC processing to obtain a channel estimation value of each cell.
  • the step of acquiring the PCCPCH-RSCP value of the corresponding cell according to the channel estimation result of each cell specifically includes: performing energy accumulation on the 16 tap values of the first channel estimation window in the channel estimation result, to obtain a third energy accumulated value, where The third energy accumulated value is the PCCPCH-RSCP value of the corresponding cell.
  • a device for performing intra-frequency measurement in a TD-SCDMA system comprising: a PIC processing module, configured to receive a multi-cell signal, and perform PIC processing on each cell to obtain a first-level channel estimation value of each cell; and an SIC processing module Performing subsequent SIC processing on each PIC processed cell according to the first-level channel estimation value of each cell to obtain channel estimation results of each cell; and acquiring, configured to acquire PCCPCH-RSCP value of the corresponding cell according to the channel estimation result of each cell .
  • the PIC processing module specifically includes: a receiving unit, configured to receive a multi-cell signal; a first calculating unit, configured to obtain, by using the FFT and the IFFT, the original channel of each cell according to the received multi-cell signal and the basic midamble code of each cell Estimating; the denoising processing unit is configured to perform denoising processing on the original channel estimation values of the cells to obtain first-level channel estimation values of the respective cells, and each channel estimation value has 128 channel estimation tap values.
  • the SIC processing module specifically includes: a second calculating unit, configured to be used for the first level of each cell
  • the 128 channel estimation tap values in the channel estimation value are energy accumulated to obtain a first energy accumulation value
  • the first sorting unit is configured to sort each cell according to the first energy accumulation value from large to small
  • the interference cancellation unit uses The SIC processing is performed on each of the sorted cells to obtain the channel estimation value of each cell
  • the third calculating unit is configured to subtract the channel estimation value of each channel from the channel estimation tap value corresponding to the previous channel estimation value, Obtaining 128 channel estimation tap differences of consecutive two-stage channel estimation values of each cell
  • a fourth calculating unit configured to perform energy accumulation on 128 channel estimation tap difference values of consecutive two-stage channel estimation values of each cell to obtain second energy
  • the second sorting unit is configured to sort the cells according to the second energy accumulation value from small to large
  • the determining unit is configured to: when the second energy accumulation value of each cell is less than a preset threshold or the interference cancellation reaches a pre
  • the interference cancellation unit specifically includes: a reconstruction subunit, configured to reconstruct, according to the basic midamble code of each cell and the latest channel estimation value, each cell signal except the current processing cell; Performing SIC processing according to the reconstructed signal to obtain an interference cancellation result; a calculation subunit, configured to calculate, according to the interference cancellation result and the basic midamble code of the currently processed cell, to obtain an initial channel estimation value of the currently processed cell; And a processing subunit, configured to perform denoising processing on the initial channel estimation value of the currently processed cell, to obtain a current channel estimation value of the currently processed cell.
  • the acquiring module is specifically configured to: perform energy accumulation on the 16 tap values of the first channel estimation window in the channel estimation result to obtain a third energy accumulated value, where the third energy accumulated value is the PCCPCH-RSCP of the corresponding cell. value.
  • the present invention relates to a method and apparatus for performing on-frequency measurement in a TD-SCDMA system, which performs PIC and SIC processing on a received multi-cell signal in sequence, and in the SIC processing, dynamically adjusts interference and eliminates the sequence, Each cell performs multi-level interference and ⁇ ⁇ ⁇ until each cell has two consecutive levels
  • the energy accumulation value of the 128 channel estimation tap difference values of the channel estimation value is less than the preset threshold value or the interference ⁇ ⁇ ⁇ reaches the predetermined number of stages, and the accurate PCCPCH-RSCP value is obtained, which is the premise of ensuring the measurement accuracy of the weak signal cell.
  • the measurement accuracy of the strong signal cell is improved.
  • FIG. 1 is a flow chart showing an embodiment of a method for performing intra-frequency measurement in a TD-SCDMA system of the present invention
  • FIG. 2 is a schematic diagram showing the specific flow of step 101 in the method for performing the same frequency measurement in the TD-SCDMA system shown in FIG. 1;
  • FIG. 3 is a schematic diagram showing a specific flow of step 102 in the method for performing the same frequency measurement in the TD-SCDMA system shown in FIG. 1;
  • Figure 5 is a block diagram showing an embodiment of an apparatus for performing the same frequency measurement in the TD-SCDMA system of the present invention
  • FIG. 6 is a schematic diagram showing the specific structure of a PIC processing module in a device for performing the same frequency measurement in the TD-SCDMA system shown in FIG. 5;
  • FIG. 7 is a schematic diagram showing the specific structure of an SIC processing module in a device for performing the same frequency measurement in the TD-SCDMA system shown in FIG. 5;
  • Fig. 8 is a view showing the specific structure of an interference canceling unit in the SIC processing module in the apparatus for performing the same frequency measurement in the TD-SCDMA system shown in Fig. 7. detailed description
  • the solution of the embodiment of the present invention is mainly: performing PIC and SIC processing on the received multi-cell signal in sequence, and performing multi-level interference and cancellation on each cell in the SIC processing until the channel estimation value of each cell is continuous.
  • the energy accumulation of the 128 channel estimation tap differences is less than the preset
  • the threshold or interference cancellation reaches a predetermined number of levels, and the channel estimation result of each cell is obtained, and the PCCPCH-RSCP value is obtained according to the channel estimation result of each cell.
  • an embodiment of the present invention provides a method for performing intra-frequency measurement in a TD-SCDMA system, including:
  • Step 101 Receive a multi-cell signal, and perform PIC processing on each cell to obtain a first-level channel estimation value of each cell.
  • the cell to be tested in order to improve the measurement accuracy in the same-frequency scenario, the cell to be tested needs to be interfered with, and the cell to be tested includes the current cell and the same-frequency neighboring cell, and is processed by the multi-cell channel estimator.
  • the capability is limited. Only a certain number of cell signals can be processed at a time, for example, 4 cells are processed at a time. Therefore, when there are a large number of cells to be tested, for example, there are 16 cells to be tested, the cells to be tested are subjected to packet processing. This embodiment will be described by taking four cells at a time as an example.
  • PIC channel estimation is performed on four cell signals, and channel estimation is performed using a classical Steiner channel estimator to obtain 128 channel estimation tap values of each cell. It should be noted that, for each received cell signal, the PIC structure is first used for channel estimation processing, which can reduce channel estimation accuracy of each cell in the subsequent stages due to inaccurate channel estimation of the first stage of the first stage under strong interference. The impact.
  • Step 102 Perform subsequent SIC processing on each PIC processed cell according to the first-level channel estimation value of each cell, and obtain channel estimation results of each cell.
  • Step 103 Acquire a PCCPCH-RSCP value of the corresponding cell according to the channel estimation result of each cell.
  • the 16 tap values of the first channel estimation window in the channel estimation result are enabled.
  • the amount is accumulated to obtain a third energy accumulated value, and the third energy accumulated value is the corresponding cell
  • step 101 specifically includes:
  • Step 1011 Receive a multi-cell signal.
  • Step 1012 Obtain original channel estimation of each cell by performing FFT and IFFT according to the received multi-cell signal and the basic midamble code of each cell.
  • Step 1013 Perform denoising on the original channel estimation of each cell to obtain a first-level channel estimation value of each cell.
  • each channel estimate has 128 channel estimation tap values.
  • step 102 specifically includes:
  • Step 1021 Perform energy accumulation on 128 channel estimation tap values in the first-level channel estimation values of the cells to obtain a first energy accumulated value.
  • Step 1022 Sort each cell according to the first energy accumulation value from large to small; Step 1023, sequentially perform SIC processing on each sorted cell to obtain an estimated channel value of each cell;
  • Step 1024 Subtracting the channel estimation value of each cell from the channel estimation tap value corresponding to the previous channel estimation value, and obtaining 128 channel estimation tap difference values of consecutive two-stage channel estimation values of each cell; Step 1025, continuously The 128 channel estimation tap values of the two-stage channel estimation value are energy accumulated to obtain a second energy accumulated value;
  • Step 1026 Sort each cell according to the second energy accumulation value from small to large; Step 1027, determine whether the second energy accumulation value of each cell is less than a preset threshold or whether the interference cancellation reaches a predetermined level; if yes, enter Step 1028; otherwise, proceed to step 1023.
  • step 1028 the SIC processing flow is exited, and the channel estimation value of each cell is the channel estimation result of each cell.
  • the first stage of each cell after the PIC processing is first performed.
  • the 128 channel estimation tap values in the channel estimation value are subjected to energy accumulation to obtain a first energy accumulation value, and the cells are sorted according to the first energy accumulation value from large to small, and the SIC processing is sequentially performed on each of the sorted cells to obtain The current channel estimation value of each cell, and then the current channel estimation value of each cell and the previous channel estimation value (it should be noted that if the first round of SIC interference cancellation, the pre-channel estimation value is PIC processed The first-stage channel estimation value is subtracted corresponding to the channel estimation tap value, and 128 channel estimation tap difference values of consecutive two-stage channel estimation values of each cell are obtained, and 128 channel estimation tap difference values of consecutive two-stage channel estimation values of each cell are obtained.
  • step 1023 specifically includes:
  • Step 10231 Reconfigure each cell signal except the currently processed cell according to the basic midamble code of each cell and the latest channel estimation value.
  • Step 10232 Perform SIC processing according to the reconstructed signal to obtain an interference cancellation result
  • Step 10233 perform calculation according to the interference cancellation result and the basic midamble code of the currently processed cell, to obtain an initial channel estimation value of the currently processed cell;
  • Step 10234 performing denoising processing on the initial channel estimation value of the currently processed cell, to obtain a current channel estimation value of the current processing cell;
  • Step 10235 Determine whether all cell interference cancellation processing is completed; if yes, exit the program, otherwise, proceed to step 10231 to perform interference on the next cell.
  • K 128 is the basic midamble code length
  • 16 is the channel estimation window length
  • 4 cells are processed at a time, there are 16 cells to be tested, and the predetermined interference cancellation level is 4, that is, the maximum level 4 interference cancellation processing is performed.
  • the specific processing steps are as follows:
  • the second step is to perform the first level interference cancellation processing, using the PIC structure, according to the received
  • the midamble code partial data and the basic midamble code of each cell calculate the original channel estimation value of each cell:
  • the received channel midamble fft #t(received_midamble)
  • Channel ifft(received_midamble_fft . /basic_midamble_fft) ( 2 ) where basic_midamble_fft is the basic midamble code frequency domain value corresponding to a cell, and ./ indicates the division of the two array corresponding numbers.
  • the channel estimation post-processing compares the result of the channel estimation with a preset threshold, and the channel estimation tap value smaller than the threshold is set to zero.
  • the SIC structure is used to perform interference on each cell, and the channel estimation result of each cell is obtained.
  • the first level of SIC interference the energy accumulation of 128 channel estimation tap values in the first-level channel estimation values of each cell, to obtain the first energy accumulation value, as shown in formula (3),
  • Each cell sorts according to the first energy accumulation value from large to small;
  • n is the number of stages of interference cancellation
  • the above SIC interference cancellation process is repeated until the energy accumulation value of the 128 channel estimation tap differences of the continuous two-stage channel estimation values of all cells is less than a preset threshold value or the level 4 interference cancellation is completed.
  • the preset threshold value may be determined according to simulation or testing.
  • the PCCPCH-RSCP value of the corresponding cell is obtained according to the channel estimation result of each cell: the 16 tap values of the first channel estimation window of each cell channel estimation result are energy-accumulated to obtain a third energy accumulated value, that is, The PCCPCH-RSCP value of the corresponding cell.
  • the second to fourth steps are repeated, and the other groups of cells are separately processed until all the packets are processed.
  • the subsequent SIC interference cancellation is performed, and the SIC processing is performed on each of the sorted cells in sequence, and the process of obtaining the channel estimation values of each cell is:
  • SIC processing is performed according to the reconstructed signal, and the interference is obtained.
  • each cell is sequentially subjected to SIC processing to obtain a channel estimation value of each cell.
  • the PIC and SIC processes are sequentially performed on the received multi-cell signal, and in the SIC processing, the interference adjustment sequence is dynamically adjusted, and multi-level interference is cancelled for each cell until two consecutive channels of each cell are used.
  • the energy accumulation value of the estimated 128 channel estimation tap differences is less than the preset threshold or the interference cancellation reaches a predetermined number of stages, and the accurate PCCPCH-RSCP value is obtained, which is improved under the premise of ensuring the measurement accuracy of the weak signal cell. Measurement accuracy of strong signal cells.
  • an embodiment of the present invention provides a device for performing intra-frequency measurement in a TD-SCDMA system, including:
  • the PIC processing module 501 is configured to receive the multi-cell signal, and perform PIC processing on each cell to obtain a first-level channel estimation value of each cell;
  • the SIC processing module 502 is configured to perform subsequent SIC processing on each PIC processed cell according to the first-level channel estimation value of each cell, to obtain channel estimation results of each cell;
  • the obtaining module 503 is configured to obtain a PCCPCH-RSCP value of the corresponding cell according to the channel estimation result of each cell.
  • the obtaining module 503 is specifically configured to perform energy accumulation on the 16 tap values of the first channel estimation window in the channel estimation result to obtain a third energy accumulated value, where the third energy accumulated value is the corresponding cell. PCCPCH-RSCP value.
  • the PIC processing module 501 specifically includes:
  • the receiving unit 5011 is configured to receive a multi-cell signal.
  • a first calculating unit 5012 configured to obtain, by using the FFT and the IFFT, the original channel estimation of each cell according to the received multi-cell signal and the basic training sequence midamble code of each cell;
  • the denoising processing unit 5013 is configured to perform denoising processing on the original channel estimation of each cell to obtain first-level channel estimation values of the respective cells, and each channel estimation value has 128 channel estimation tap values.
  • the SIC processing module 502 specifically includes:
  • a second calculating unit 5021 configured to perform energy accumulation on 128 channel estimation tap values in the first-level channel estimation values of the cells, to obtain a first energy accumulated value
  • a first sorting unit 5022 configured to sort each cell according to a first energy accumulation value from largest to smallest
  • the interference cancellation unit 5023 is configured to sequentially perform SIC processing on each sorted cell to obtain an estimated channel value of each channel of each cell;
  • the third calculating unit 5024 is configured to subtract the channel estimation value of each cell from the channel estimation tap value corresponding to the previous channel estimation value, and obtain 128 channel estimation tap difference values of consecutive two channel estimation values of each cell;
  • a fourth calculating unit 5025 configured to perform energy accumulation on 128 channel estimation tap differences of consecutive two-stage channel estimation values of each cell to obtain a second energy accumulated value
  • a second sorting unit 5026 configured to sort each cell according to a second energy accumulation value from small to large;
  • the determining unit 5027 is configured to exit the SIC processing procedure when the second energy accumulation value of each cell is less than a preset threshold or the interference ⁇ ⁇ reaches a predetermined number of stages, and the channel estimation value of each cell is a channel of each cell. The result is estimated; otherwise, the interference cancellation unit 5023 sequentially performs interference cancellation processing on each of the sorted cells to obtain a channel estimation value of each cell.
  • the interference unit 5023 specifically includes:
  • the reconstruction subunit 50231 is configured to reconstruct, according to the basic midamble code of each cell and the latest channel estimation value, each cell signal except the currently processed cell;
  • the interference cancellation subunit 50232 is configured to perform SIC processing according to the reconstructed signal to obtain an interference cancellation result;
  • the calculating subunit 50233 is configured to calculate, according to the interference cancellation result and the basic midamble code of the currently processed cell, to obtain an initial channel estimation value of the currently processed cell;
  • the PIC and SIC processes are sequentially performed on the received multi-cell signal, and in the SIC processing, the interference adjustment sequence is dynamically adjusted, and multi-level interference is cancelled for each cell until two consecutive channels of each cell are used.
  • the energy accumulation value of the estimated 128 channel estimation tap differences is less than the preset threshold or the interference cancellation reaches a predetermined number of stages, and the accurate PCCPCH-RSCP value is obtained, which is improved under the premise of ensuring the measurement accuracy of the weak signal cell. Measurement accuracy of strong signal cells.

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Description

TD-SCDMA系统中进行同频测量的方法及装置 技术领域
本发明涉及无线通信领域， 尤其涉及一种 TD-SCDMA ( Time Division Synchronous Code Division Multiple Access, 时分同步码分多址接入 ) 系统 中进行同频测量的方法及装置。 背景技术
为了提高频谱利用率， TD-SCDMA系统釆用同频组网技术作为一种有 效的解决方案， 但是同频组网技术在提高频谱利用率的同时， 也带来了同 频干扰问题。 同频干扰即是邻近的同频小区因为使用相同的载波频率进行 数据传输而造成的不同小区间的信号干扰， 同频干扰会使系统性能下降。
另一方面， 为了提高用户体验度和支持移动通信， TD-SCDMA系统中 需要进行同频小区间的重选和切换。 小区重选是指 UE ( User Equipment, 用户终端）在空闲模式下， 通过随时监测本小区和邻近小区的信号质量来 选择一个最好的小区提供服务；小区切换是指当 UE从一个小区移动到另一 个小区时， 为了保持 UE的通信不中断而需要进行的信道切换。
PCCPCH ( Primary Common Control Physical Channel, 主公共控制物理 信道）上以 RSCP ( Received Signal Code Power, 接收信号码功率） 的值来 标识小区信号的强弱， 同频小区间的重选或者切换性能， 均依赖于同频测 量的当前小区和同频邻近小区 PCCPCH-RSCP值的测量结果的精度。 现有 技术中， PCCPCH -RSCP的测量值， 是利用 TS0时隙中的 midamble码（训 练序列码）上的信道估计值的第一个信道窗中信道估计抽头值计算得来的。
在 TD-SCDMA系统中， 单小区信道估计通常釆用经典的 Steiner信道 估计器来完成， 它是一种低代价的信道估计方法， 其基本原理是： 通过一 个基本 midamble码按一定规律构造出每个小区的 midamble码， 从而使得 在接收端的 midamble码系统矩阵具有循环相关性，并通过 FFT( Fast Fourier Transform, 快速傅里叶更换)和 IFFT ( Inverse Fast Fourier Transform, 快 速傅里叶逆变换）计算快速得到信道估计值。 具体计算过程为： Steiner信 道估计器先进行频域计算， 再通过 IFFT逆变换， 得到时域信道估计值， 最 后通过信道估计后处理去掉噪声影响， 得到信道估计结果。
对于具有同频邻近小区信号干扰的当前小区， 其接收的信号中， 除了 本小区 TS0时隙信号外， 还有邻近小区的 TS0时隙信号， 因此需要进行多 个同频小区的联合信道估计， 才能得到比较精确的信道估计结果。 多个同 频小区的联合信道估计一般釆用 SIC ( Successive Interference Cancellation, 串行干扰抵消）或者 PIC ( Parallel Interference Cancellation, 并行干扰抵消） 两种结构。
SIC一般釆用逐步减去最大用户干扰的方法，通过 SIC检测器对接收的 多个用户信号逐个进行数据判决， 判决一个之后再造一个， 同时减去该用 户重构信号， 按照信号功率大小的顺序， 对功率大的信号先进行操作， 使 得功率最弱的信号受益最大， 而功率最强的信号受益最少， 因此， SIC对弱 信号的检测性能较好， 而对强信号的检测性能较差， 而且在信号功率发生 变化时需要重新排序， 另外， SIC处理过程中， 如果初始数据判决不可靠， 将对下级产生较大的干扰， 从而引起后面各级性能均下降。
PIC 一般釆用每一级均同时判决、 再生和抵消的方法， 也就是说 PIC 利用前级判决的信息构造所有用户的干扰信号， 然后从接收的信号中抵消 掉干扰信号， 最后同时判决。 由于 PIC釆用并行处理信号干扰的方式， 不 需要对处理信号进行排序， 因此 PIC对弱信号的检测能力较差， 当功率控 制不理想时， 比如在多径信道中， PIC的性能比 SIC差。 发明内容
有鉴于此，本发明的主要目的在于提供一种 TD-SCDMA系统中进行同 频测量的方法及装置， 旨在解决现有技术中同频多小区场景下， PCCPCH-RSCP值对强信号小区和弱信号小区不能兼顾的问题。
为了解决上述技术问题， 本发明的技术方案是这样实现的：
一种时分同步码分多址接入 TD-SCDMA系统中进行同频测量的方法， 包括以下步骤： 接收多小区信号， 并对各小区进行并行干扰抵消 PIC处理， 得到各小区第一级信道估计值； 根据各小区第一级信道估计值对 PIC处理 后的各小区进行后续各级串行干扰 ·ί氏消 SIC处理， 得到各小区信道估计结 果； 根据各小区信道估计结果获取相应小区的主公共控制物理信道接收信 号码道功率 PCCPCH-RSCP值。
所述对各小区进行 PIC处理， 得到各小区第一级信道估计值的步骤具 体包括： 根据接收的多小区信号和各小区的基本训练序列 midamble码， 通 过快速傅里叶变换 FFT和快速傅里叶逆变换 IFFT, 得到各小区原始信道估 计； 对各小区原始信道估计值进行去噪处理得到各个小区第一级信道估计 值， 每个信道估计值具有 128个信道估计抽头值。
所述根据各小区第一级信道估计值对 PIC处理后的各小区进行后续各 级 SIC处理， 得到各小区信道估计结果的步骤具体包括： 对各小区的第一 级信道估计值中的 128个信道估计抽头值进行能量累加， 得到第一能量累 加值； 将各小区根据第一能量累加值从大到小进行排序； 对排序后的各小 区依次进行 SIC处理， 得到各小区本级信道估计值； 将各小区本级信道估 计值与前级信道估计值对应信道估计抽头值相减， 得到各小区连续两级信 道估计值的 128个信道估计抽头差值；将各小区连续两级信道估计值的 128 个信道估计抽头差值进行能量累加， 得到第二能量累加值； 将各小区根据 第二能量累加值从小到大进行排序； 当各小区第二能量累加值均小于预设 门限值或干扰抵消达到预定级数时， 退出 SIC处理流程， 各小区本级信道 估计值即为各小区信道估计结果； 否则， 返回对排序后的各小区依次进行 干扰 ·ί氏消处理， 得到各小区本级信道估计值的步骤。
所述对排序后的各小区依次进行 SIC处理， 得到各小区本级信道估计 值的步骤具体包括： 根据各小区的基本 midamble码和最新的信道估计值， 重构除当前处理小区以外的其它各小区信号； 根据重构的信号进行 SIC处 理，得到干扰抵消结果；根据干扰抵消结果和当前处理小区的基本 midamble 码进行计算， 得到当前处理小区的初始信道估计值； 对当前处理小区的初 始信道估计值进行去噪处理， 得到当前处理小区的本级信道估计值； 重复 上述步骤， 依次对各小区进行 SIC处理， 得到各小区本级信道估计值。
所述根据各小区信道估计结果获取相应小区的 PCCPCH-RSCP值的步 骤具体包括： 将信道估计结果中第一个信道估计窗的 16个抽头值进行能量 累加， 得到第三能量累加值， 所述第三能量累加值即为相应小区的 PCCPCH-RSCP值。
一种 TD-SCDMA系统中进行同频测量的装置， 包括： PIC处理模块， 用于接收多小区信号， 并对各小区进行 PIC处理， 得到各小区第一级信道 估计值； SIC处理模块，用于根据各小区第一级信道估计值对 PIC处理后的 各小区进行后续各级 SIC处理， 得到各小区信道估计结果； 获取模块， 用 于根据各小区信道估计结果获取相应小区的 PCCPCH-RSCP值。
所述 PIC处理模块具体包括： 接收单元， 用于接收多小区信号； 第一 计算单元， 用于根据接收的多小区信号和各小区的基本 midamble码， 通过 进行 FFT和 IFFT, 得到各小区原始信道估计； 去噪处理单元， 用于对各小 区原始信道估计值进行去噪处理得到各个小区的第一级信道估计值， 每个 信道估计值具有 128个信道估计抽头值。
所述 SIC处理模块具体包括： 第二计算单元， 用于对各小区的第一级 信道估计值中的 128个信道估计抽头值进行能量累加， 得到第一能量累加 值； 第一排序单元， 用于将各小区根据第一能量累加值从大到小进行排序； 干扰抵消单元， 用于对排序后的各小区依次进行 SIC处理， 得到各小区本 级信道估计值； 第三计算单元， 用于将各小区本级信道估计值与前级信道 估计值对应信道估计抽头值相减， 得到各小区连续两级信道估计值的 128 个信道估计抽头差值； 第四计算单元， 用于将各小区连续两级信道估计值 的 128个信道估计抽头差值进行能量累加， 得到第二能量累加值； 第二排 序单元， 用于将各小区根据第二能量累加值从小到大进行排序； 判断单元， 用于当各小区第二能量累加值小于预设门限值或干扰抵消达到预定级数 时， 退出 SIC处理程序， 各小区本级信道估计值即为各小区信道估计结果； 否则由干扰抵消单元对排序后的各小区依次进行 SIC处理， 得到各小区本 级信道估计值。
所述干扰抵消单元具体包括： 重构子单元， 用于根据各小区的基本 midamble码和最新的信道估计值， 重构除当前处理小区以外的其它各小区 信号； 干扰 4氏消子单元， 用于根据重构的信号进行 SIC处理， 得到干扰 4氐 消结果； 计算子单元， 用于根据干扰抵消结果和当前处理小区的基本 midamble码进行计算， 得到当前处理小区的初始信道估计值； 去噪处理子 单元， 用于对当前处理小区的初始信道估计值进行去噪处理， 得到当前处 理小区的本级信道估计值。
所述获取模块具体用于： 将信道估计结果中第一个信道估计窗的 16个 抽头值进行能量累加， 得到第三能量累加值， 所述第三能量累加值即为相 应小区的 PCCPCH-RSCP值。
本发明一种 TD-SCDMA系统中进行同频测量的方法及装置，通过对接 收的多小区信号依次进行 PIC以及 SIC处理， 并且在 SIC处理中， 釆用动 态调整干扰 ·ί氏消顺序， 对各小区进行多级干扰 ·ί氏消， 直到各小区连续两级 信道估计值的 128个信道估计抽头差值的能量累加值均小于预设门限值或 干扰 ·ί氏消达到预定级数， 获取精确的 PCCPCH-RSCP值， 在保证弱信号小 区测量精度的前提下， 提高了强信号小区的测量精度。 附图说明
图 1是本发明 TD-SCDMA系统中进行同频测量的方法一实施例流程示 意图；
图 2是图 1所示的 TD-SCDMA系统中进行同频测量的方法中步骤 101 具体流程示意图；
图 3是图 1所示的 TD-SCDMA系统中进行同频测量的方法中步骤 102 具体流程示意图；
图 4是图 3所示的 TD-SCDMA系统中进行同频测量的方法步骤 102中 步骤 1023具体流程示意图；
图 5是本发明 TD-SCDMA系统中进行同频测量的装置一实施例结构示 意图；
图 6是图 5所示的 TD-SCDMA系统中进行同频测量的装置中 PIC处理 模块具体结构示意图；
图 7是图 5所示的 TD-SCDMA系统中进行同频测量的装置中 SIC处理 模块具体结构示意图；
图 8是图 7所示的 TD-SCDMA系统中进行同频测量的装置中 SIC处理 模块中的干扰抵消单元的具体结构示意图。 具体实施方式
本发明实施例解决方案主要是：通过对接收的多小区信号依次进行 PIC 以及 SIC处理， 在 SIC处理中， 对各小区进行多级干扰 ·ί氏消， 直到各小区 连续两级信道估计值的 128个信道估计抽头差值的能量累加值均小于预设 门限值或干扰抵消达到预定级数， 得到各小区信道估计结果， 根据各小区 信道估计结果获取 PCCPCH-RSCP值。
为了使本发明的技术方案更加清楚、 明了， 下面将结合附图作进一步 详述。
如图 1所示，本发明一实施例提出一种 TD-SCDMA系统中进行同频测 量的方法， 包括：
步骤 101 , 接收多小区信号， 并对各小区进行 PIC处理， 得到各小区第 一级信道估计值；
本实施例中， 为了提高同频场景下的测量精度， 需要对待测小区进行 干扰 ·ί氏消处理， 其中， 待测的小区包括本小区和同频邻小区， 由于多小区 信道估计器的处理能力有限， 每次只能对一定数量的小区信号进行处理， 比如一次处理 4个小区， 因此， 当待测小区数量较多时， 比如有 16个待测 小区， 则需对待测小区进行分组处理。 本实施例以一次处理 4个小区为例 进行说明。
首先（第一级处理）， 对 4个小区信号进行 PIC信道估计， 釆用经典的 Steiner信道估计器进行信道估计， 得到各小区的 128个信道估计抽头值。 需要说明的是， 对接收的各小区信号首先釆用 PIC结构进行信道估计处理， 可以减小在强干扰下， 由于第一级第一个小区信道估计不准确对后续各级 各个小区信道估计精度造成的影响。
步骤 102,根据各小区第一级信道估计值对 PIC处理后的各小区进行后 续各级 SIC处理， 得到各小区信道估计结果；
本步骤下面将结合图 3作具体说明。
步骤 103 , 根据各小区信道估计结果获取相应小区的 PCCPCH-RSCP 值。
本步骤中， 将信道估计结果中第一个信道估计窗的 16个抽头值进行能 量累加， 得到第三能量累加值， 第三能量累加值即为相应小区的
PCCPCH-RSCP值。
如图 2所示， 其中步骤 101具体包括：
步骤 1011 , 接收多小区信号；
步骤 1012,根据接收的多小区信号和各小区的基本 midamble码， 通过 进行 FFT和 IFFT, 得到各小区原始信道估计；
步骤 1013 , 对各小区原始信道估计进行去噪处理得到各个小区的第一 级信道估计值。
其中， 每个信道估计值具有 128个信道估计抽头值。
如图 3所示， 其中步骤 102具体包括：
步骤 1021 , 对各小区的第一级信道估计值中的 128个信道估计抽头值 进行能量累加， 得到第一能量累加值；
步骤 1022, 将各小区根据第一能量累加值从大到小进行排序； 步骤 1023 , 对排序后的各小区依次进行 SIC处理， 得到各小区本级信 道估计值；
步骤 1024, 将各小区本级信道估计值与前级信道估计值对应信道估计 抽头值相减， 得到各小区连续两级信道估计值的 128个信道估计抽头差值； 步骤 1025 , 将各小区连续两级信道估计值的 128个信道估计抽头差值 进行能量累加， 得到第二能量累加值；
步骤 1026, 将各小区根据第二能量累加值从小到大进行排序； 步骤 1027 , 判断各小区第二能量累加值是否均小于预设门限值或干扰 抵消是否达到预定级数； 如果是， 进入步骤 1028; 否则， 进入步骤 1023。
步骤 1028, 退出 SIC处理流程， 各小区本级信道估计值即为各小区信 道估计结果。
上述步骤 1021至步骤 1028中， 首先对 PIC处理后的各小区的第一级 信道估计值中的 128个信道估计抽头值进行能量累加， 得到第一能量累加 值， 将各小区根据第一能量累加值从大到小进行排序， 对排序后的各小区 依次进行 SIC处理， 得到各小区本级信道估计值， 之后， 将各小区本级信 道估计值与前级信道估计值（需要说明的是， 如果为第一轮 SIC干扰抵消， 则前级信道估计值为 PIC处理后的第一级信道估计值）对应信道估计抽头 值相减， 得到各小区连续两级信道估计值的 128个信道估计抽头差值， 将 各小区连续两级信道估计值的 128个信道估计抽头差值进行能量累加， 得 到第二能量累加值， 将各小区根据第二能量累加值从小到大进行排序， 进 入下一轮干扰抵消处理程序， 直到所有小区连续两级信道估计值的 128个 信道估计抽头差值的能量累加值均小于预设门限值或干扰抵消达到预定次 数。
如图 4所示， 在本实施例中， 上述步骤 1023具体包括：
步骤 10231 , 根据各小区的基本 midamble码和最新的信道估计值， 重 构除当前处理小区以外的其它各小区信号；
步骤 10232, 根据重构的信号进行 SIC处理， 得到干扰 ·ί氏消结果； 步骤 10233 , 根据干扰抵消结果和当前处理小区的基本 midamble码进 行计算， 得到当前处理小区的初始信道估计值；
步骤 10234,对当前处理小区的初始信道估计值进行去噪处理， 得到当 前处理小区的本级信道估计值；
步骤 10235 ,判断是否所有小区干扰抵消处理完毕；若是，则退出程序， 否则， 进入步骤 10231 , 对下一个小区进行干扰 ·ί氏消处理。
Ρ
下面以 ： = 8为例具体说明本发明实施例技术方案， 其中，
K = 128为基本 midamble码长度， = 16为信道估计窗长度， 一次处理 4个 小区， 有 16个待测小区， 预定干扰抵消级数为 4, 即最多做 4级干扰抵消 处理。 具体处理步骤如下：
第一步， 将 16个小区分成 4组， 分别为 1 ~ 4, 5 ~ 8 , 9 ~ 12 , 13 - 16; 第二步， 进行第一级干扰抵消处理， 釆用 PIC 结构， 根据接收的 midamble码部分数据和各个小区的基本 midamble码，计算各个小区的原始 信道估计值：
首先计算接收的 128chip的 midamble部分数据 received_midamble的频域 值 received midamble fft：
received midamble fft = #t(received_midamble) ( 1 ) 信道估计值 channel的计算是先将两个频域值相除， 得到的结果再 IFFT 变换到时域， 具体计算如下：
channel = ifft(received_midamble_fft . /basic_midamble_fft) ( 2 ) 其中 basic_midamble_fft是一个小区对应的基本 midamble码频域值， ./表 示两个数组对应数相除。
将得到的时域信号进行信道估计后处理去噪得到各个小区的第一级信 道估计值；
其中， 信道估计后处理是将上述信道估计的结果和一个预先设定的门 限进行比较， 小于门限的信道估计抽头值置为 0。得到最多 4个小区的信道 估计值 channel(l :128, i), 其中， i=l、 2、 3、 4, 表示小区索引号。
第三步， 釆用 SIC结构， 对各小区进行干扰 ·ί氏消处理， 得到各小区信 道估计结果。
首先， 第一级 SIC干扰 ·ί氏消， 对各小区的第一级信道估计值中的 128 个信道估计抽头值进行能量累加， 得到第一能量累加值， 如公式（3 )所示， 将各小区根据第一能量累加值从大到小进行排序；
128
power (i) - ^ real (channel (k, ί))2 -imag (channel (k, ί))2 ( 3 ) 其次， 后续各级 SIC干扰抵消： 对上述排序后的各小区依次进行干扰 抵消处理， 得到各小区本级信道估计值； 将各小区本级信道估计值与前级 信道估计值 (第一级 SIC干扰 ·ί氏消中， 各小区前级信道估计值为 PIC处理 后的第一级信道估计值）对应信道估计抽头值相减， 得到各小区连续两级 信道估计值的 128个信道估计抽头差值； 将各小区连续两级信道估计值的 128个信道估计抽头差值进行能量累加， 得到第二能量累加值， 如公式（4 ) 所示； 将各小区根据第二能量累加值从小到大进行排序。
powern (/)
128
= ^ [real (channel n (k, /)) - real (channel^ (k, i))f + [imag (channel n (k, /)) - imag (channel^ (k, /))]
( 4 ) 其中， n是干扰抵消的级数， PIC处理步骤设置为第一级干扰抵消， 所 以在 SIC干扰抵消处理中， n=2、 3、 4;
重复上述 SIC干扰抵消过程， 直到所有小区的连续两级信道估计值的 128个信道估计抽头差值的能量累加值均小于预设的门限值或者完成 4级干 扰抵消。 本实施例中， 预设的门限值可以根据仿真或者测试来确定。 最后 得到各小区信道估计结果， 即最后一轮干扰抵消获得的信道估计值。
第四步，根据各小区信道估计结果获取相应小区的 PCCPCH-RSCP值： 将各个小区信道估计结果的第一个信道估计窗的 16个抽头值进行能量 累加， 得到第三能量累加值， 即为相应小区的 PCCPCH-RSCP值。
第五步， 重复第二步至第四步， 对其它组小区分别进行处理， 直到所 有的分组都处理完。
其中在第三步进行后续各级 SIC干扰抵消中， 对排序后的各小区依次 进行 SIC处理， 得到各小区本级信道估计值的过程为：
根据各小区的基本 midamble码和最新的信道估计值， 重构除当前处理 小区以外的其它各小区信号；
根据重构的信号进行 SIC处理， 得到干扰 ·ί氏消结果；
根据干扰抵消结果和当前处理小区的基本 midamble码进行计算， 得到 当前处理小区的初始信道估计值；
对当前处理小区的初始信道估计值进行去噪处理， 得到当前处理小区 的本级信道估计值；
重复上述步骤， 依次对各小区进行 SIC处理， 得到各小区本级信道估 计值。
本发明实施例通过对接收的多小区信号依次进行 PIC以及 SIC处理， 并且在 SIC处理中， 釆用动态调整干扰抵消顺序， 对各小区进行多级干扰 4氐消， 直到各小区连续两级信道估计值的 128个信道估计抽头差值的能量 累加值均小于预设门限值或干扰抵消达到预定级数， 获取精确的 PCCPCH-RSCP值，在保证弱信号小区测量精度的前提下，提高了强信号小 区的测量精度。
如图 5所示，本发明一实施例提出一种 TD-SCDMA系统中进行同频测 量的装置， 包括：
PIC处理模块 501 , 用于接收多小区信号， 并对各小区进行 PIC处理， 得到各小区第一级信道估计值；
SIC处理模块 502,用于根据各小区第一级信道估计值对 PIC处理后的 各小区进行后续各级 SIC处理， 得到各小区信道估计结果；
获取模块 503 , 用于根据各小区信道估计结果获取相应小区的 PCCPCH-RSCP值。 本实施例中， 获取模块 503具体用于， 将信道估计结果 中第一个信道估计窗的 16个抽头值进行能量累加， 得到第三能量累加值， 所述第三能量累加值即为相应小区的 PCCPCH-RSCP值。
如图 6所示， PIC处理模块 501具体包括：
接收单元 5011 , 用于接收多小区信号；
第一计算单元 5012, 用于根据接收的多小区信号和各小区的基本训练 序列 midamble码， 通过进行 FFT和 IFFT, 得到各小区的原始信道估计； 去噪处理单元 5013 , 用于对各小区原始信道估计进行去噪处理得到各 个小区的第一级信道估计值， 每个信道估计值具有 128个信道估计抽头值。
如图 7所示， SIC处理模块 502具体包括：
第二计算单元 5021 , 用于对各小区的第一级信道估计值中的 128个信 道估计抽头值进行能量累加 , 得到第一能量累加值；
第一排序单元 5022, 用于将各小区根据第一能量累加值从大到小进行 排序；
干扰抵消单元 5023 , 用于对排序后的各小区依次进行 SIC处理， 得到 各小区本级信道估计值；
第三计算单元 5024, 用于将各小区本级信道估计值与前级信道估计值 对应信道估计抽头值相减， 得到各小区连续两级信道估计值的 128个信道 估计抽头差值；
第四计算单元 5025, 用于将各小区连续两级信道估计值的 128个信道 估计抽头差值进行能量累加， 得到第二能量累加值；
第二排序单元 5026, 用于将各小区根据第二能量累加值从小到大进行 排序；
判断单元 5027, 用于当各小区第二能量累加值均小于预设门限值或干 扰 ·ί氏消达到预定级数时， 退出 SIC处理程序， 各小区本级信道估计值即为 各小区信道估计结果； 否则由干扰抵消单元 5023对排序后的各小区依次进 行干扰抵消处理， 得到各小区本级信道估计值。
如图 8所示， 干扰 4氐消单元 5023具体包括：
重构子单元 50231 , 用于根据各小区的基本 midamble码和最新的信道 估计值， 重构除当前处理小区以外的其它各小区信号；
干扰抵消子单元 50232,用于根据重构的信号进行 SIC处理，得到干扰 抵消结果； 计算子单元 50233 , 用于根据干扰抵消结果和当前处理小区的基本 midamble码进行计算， 得到当前处理小区的初始信道估计值；
去噪处理子单元 50234,用于对当前处理小区的初始信道估计值进行去 噪处理， 得到当前处理小区的本级信道估计值。
本发明实施例通过对接收的多小区信号依次进行 PIC以及 SIC处理， 并且在 SIC处理中， 釆用动态调整干扰抵消顺序， 对各小区进行多级干扰 4氐消， 直到各小区连续两级信道估计值的 128个信道估计抽头差值的能量 累加值均小于预设门限值或干扰抵消达到预定级数， 获取精确的 PCCPCH-RSCP值，在保证弱信号小区测量精度的前提下，提高了强信号小 区的测量精度。
以上所述仅为本发明的优选实施例， 并非因此限制本发明的专利范围， 凡是利用本发明说明书及附图内容所作的等效结构或流程变换， 或直接或 间接运用在其他相关的技术领域， 均同理包括在本发明的专利保护范围内。

Claims

权利要求书
1、 一种时分同步码分多址接入 TD-SCDMA系统中进行同频测量的方 法， 其特征在于， 包括以下步骤：
接收多小区信号， 并对各小区进行并行干扰抵消 PIC处理， 得到各小 区第一级信道估计值；
根据各小区第一级信道估计值对 PIC处理后的各小区进行后续各级串 行干扰 ·ί氏消 SIC处理， 得到各小区信道估计结果；
根据各小区信道估计结果获取相应小区的主公共控制物理信道接收信 号码道功率 PCCPCH-RSCP值。
2、 根据权利要求 1所述的方法， 其特征在于， 所述对各小区进行 PIC 处理， 得到各小区第一级信道估计值的步骤具体包括：
根据接收的多小区信号和各小区的基本训练序列 midamble码， 通过快 速傅里叶变换 FFT和快速傅里叶逆变换 IFFT, 得到各小区原始信道估计； 对各小区原始信道估计值进行去噪处理得到各个小区第一级信道估计 值， 每个信道估计值具有 128个信道估计抽头值。
3、 根据权利要求 1或 2所述的方法， 其特征在于， 所述根据各小区第 一级信道估计值对 PIC处理后的各小区进行后续各级 SIC处理， 得到各小 区信道估计结果的步骤具体包括：
对各小区的第一级信道估计值中的 128个信道估计抽头值进行能量累 加， 得到第一能量累加值；
将各小区根据第一能量累加值从大到小进行排序；
对排序后的各小区依次进行 SIC处理， 得到各小区本级信道估计值； 将各小区本级信道估计值与前级信道估计值对应信道估计抽头值相 减， 得到各小区连续两级信道估计值的 128个信道估计抽头差值；
将各小区连续两级信道估计值的 128个信道估计抽头差值进行能量累 加， 得到第二能量累加值；
将各小区根据第二能量累加值从小到大进行排序；
当各小区第二能量累加值均小于预设门限值或干扰抵消达到预定级数 时， 退出 SIC处理流程， 各小区本级信道估计值即为各小区信道估计结果； 否则，
返回对排序后的各小区依次进行干扰抵消处理， 得到各小区本级信道 估计值的步骤。
4、 根据权利要求 3所述的方法， 其特征在于， 所述对排序后的各小区 依次进行 SIC处理， 得到各小区本级信道估计值的步骤具体包括：
根据各小区的基本 midamble码和最新的信道估计值， 重构除当前处理 小区以外的其它各小区信号；
根据重构的信号进行 SIC处理， 得到干扰 ·ί氏消结果；
根据干扰抵消结果和当前处理小区的基本 midamble码进行计算， 得到 当前处理小区的初始信道估计值；
对当前处理小区的初始信道估计值进行去噪处理， 得到当前处理小区 的本级信道估计值；
重复上述步骤， 依次对各小区进行 SIC处理， 得到各小区本级信道估 计值。
5、 根据权利要求 1或 2所述的方法， 其特征在于， 所述根据各小区信 道估计结果获取相应小区的 PCCPCH-RSCP值的步骤具体包括：
将信道估计结果中第一个信道估计窗的 16个抽头值进行能量累加， 得 到第三能量累加值， 所述第三能量累加值即为相应小区的 PCCPCH-RSCP 值。
6、 一种 TD-SCDMA系统中进行同频测量的装置， 其特征在于， 包括： PIC处理模块， 用于接收多小区信号， 并对各小区进行 PIC处理， 得到 各小区第一级信道估计值；
SIC处理模块，用于根据各小区第一级信道估计值对 PIC处理后的各小 区进行后续各级 SIC处理， 得到各小区信道估计结果；
获取模块， 用于根据各小区信道估计结果获取相应小区的
PCCPCH-RSCP值。
7、 根据权利要求 6所述的装置， 其特征在于， 所述 PIC处理模块具体 包括：
接收单元， 用于接收多小区信号；
第一计算单元， 用于根据接收的多小区信号和各小区的基本 midamble 码， 通过进行 FFT和 IFFT, 得到各小区原始信道估计；
去噪处理单元， 用于对各小区原始信道估计值进行去噪处理得到各个 小区的第一级信道估计值， 每个信道估计值具有 128个信道估计抽头值。
8、 根据权利要求 6或 7所述的装置， 其特征在于， 所述 SIC处理模块 具体包括：
第二计算单元， 用于对各小区的第一级信道估计值中的 128个信道估 计抽头值进行能量累加， 得到第一能量累加值；
第一排序单元， 用于将各小区根据第一能量累加值从大到小进行排序； 干扰抵消单元， 用于对排序后的各小区依次进行 SIC处理， 得到各小 区本级信道估计值；
第三计算单元， 用于将各小区本级信道估计值与前级信道估计值对应 信道估计抽头值相减， 得到各小区连续两级信道估计值的 128个信道估计 抽头差值；
第四计算单元， 用于将各小区连续两级信道估计值的 128个信道估计 抽头差值进行能量累加， 得到第二能量累加值；
第二排序单元， 用于将各小区根据第二能量累加值从小到大进行排序； 判断单元， 用于当各小区第二能量累加值小于预设门限值或干扰抵消 达到预定级数时， 退出 SIC处理程序， 各小区本级信道估计值即为各小区 信道估计结果； 否则由干扰抵消单元对排序后的各小区依次进行 SIC处理， 得到各小区本级信道估计值。
9、 根据权利要求 8所述的装置， 其特征在于， 所述干扰抵消单元具体 包括：
重构子单元，用于根据各小区的基本 midamble码和最新的信道估计值， 重构除当前处理小区以外的其它各小区信号；
干扰抵消子单元， 用于根据重构的信号进行 SIC处理， 得到干扰抵消 结果；
计算子单元， 用于根据干扰抵消结果和当前处理小区的基本 midamble 码进行计算， 得到当前处理小区的初始信道估计值；
去噪处理子单元， 用于对当前处理小区的初始信道估计值进行去噪处 理， 得到当前处理小区的本级信道估计值。
10、 根据权利要求 6或 7所述的装置， 其特征在于， 所述获取模块具 体用于：
将信道估计结果中第一个信道估计窗的 16个抽头值进行能量累加， 得 到第三能量累加值， 所述第三能量累加值即为相应小区的 PCCPCH-RSCP 值。
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