Method and device for discriminating cell window in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) combined detection
A technology of TD-SCDMA and joint detection, which is applied in the field of discrimination method and device of noise window and signal window, and can solve problems such as performance degradation and occupancy
Active Publication Date: 2014-07-09
SPREADTRUM COMM (SHANGHAI) CO LTD
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[0010] In order to overcome the problem that the introduction of the noise window will take up the share of 8 joint detection windows, resulting in that the effective same-frequency interference window cannot enter the joint detection and cause a lot of performance degradation, the present invention provides a TD-SCDMA joint detection center The discriminating method and device of the cell window, the window of the cell is discriminated between the signal window and the noise window, the noise window is deleted, and only the signal window is output for joint detection, so as to improve the joint detection performance and achieve the purpose of saving instructions
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[0026] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0027] see figure 1 As shown, it is a schematic diagram of downlink local cell window activation estimation, which specifically includes the following process:
[0028]First, the radio frequency signal is amplified by a low-noise amplifier (LAN), then demodulated by an I / O demodulation unit, filtered by an amplified low-pass filter, sampled by an analog-to-digital converter, and filtered by a finite impulse response (FIR) filter The data, its training sequence (midamble code) enters the channel estimator (Channel Estimation, CHE) for channel estimation, and the signal window and noise window are judged according to the channel estimation results of the current user and the estimation results of the non-local user.
[0029] see figure 2 As shown, it is a flow chart of the cell window discrimination method, which specifically includes the following...
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The invention discloses a method and a device for discriminating a local cell window in TD-SCDMA joint detection, and aims to provide a method for discriminating a noise window and a signal window in the joint detection. The present invention judges that the current user window is a signal window or a noise window according to the relationship between the maximum diameter position of the signal in the current user window and the maximum diameter position of the signal in the maximum power window of the current user; according to the maximum diameter position of the signal in the non-local user window The relationship between the maximum path position of the signal in the maximum power window of the user and the alignment probability between the maximum path position of the signal in the window of the maximum power of the user and the maximum path position of the signal in the window of the maximum power of the user to determine that the non-user window is a signal window or noise window, and delete the noise window in the joint detection, and only output the signal window to improve the joint detection performance and achieve the purpose of saving instructions.
Description
technical field [0001] The invention relates to a joint detection method, in particular to a method and a device for discriminating noise windows and signal windows in joint detection. Background technique [0002] Joint detection is a multi-user detection scheme in TD-SCDMA technology. Joint detection detects multiple users at the same time and minimizes the multiple access interference of all users, thereby increasing the user load of each carrier. However, in the TD-SCDMA communication system, there are more than three ways to allocate the training sequence (Midamble), user equipment (UE) specific midamble allocation, default midamble allocation, and public midamble allocation. In an actual network, the most commonly used is the default (default) allocation method. In TD-SCDMA, Midamble is located in the middle of the time slot and has a length of 144 chips. It is constructed from the Midamble basic code with a length of 128 chips. This involves a parameter K, and K=2,...
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IPC IPC(8): H04L25/03H04B1/7105
Inventor 董霄剑刘威鑫许佰魁
Owner SPREADTRUM COMM (SHANGHAI) CO LTD