Downlink synchronous tracking method and downlink synchronous tracking device
A synchronous tracking and line synchronization technology, applied in the communication, transmission system, electrical components and other directions between multiple stations, can solve problems such as difficult to capture, inaccurate, and difficult to meet the synchronization requirements of TD-SCDMA system, and achieves high time Domain resolution, the effect of meeting downlink synchronization requirements
Active Publication Date: 2012-12-05
SANECHIPS TECH CO LTD
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However, in multi-path fading channels, such as the channel in the third case (CASE3), since the SYNC-DL code length of the TD-SCDMA system is only 64 chips, it is difficult to capture, especially when the UE moves fast, simply use the The SYNC-DL code of a single subframe is correlated with the local SYNC-DL code of the UE to obtain downlink synchronization information, which may not be accurate enough to meet the high-precision synchronization requirements of the TD-SCDMA system
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[0050] The basic idea of the present invention is: use the SYNC-DL code in the subframe as the object of downlink synchronous tracking, correlate the far-end SYNC-DL code with the local SYNC-DL code, and use the interpolation method to improve the timing of the original signal. domain resolution, and filter out the interference signal through the IIR filter to obtain the correlation peak value, adjust the filter coefficient α of the IIR filter according to the comparison result of the correlation peak value and the ideal peak value, so as to ensure that the moving speed of the UE is between static, slow and high speed During conversion, the position of the frame header can be accurately captured to meet the downlink synchronization requirements.
[0051] The following describes the downlink synchronous tracking method of the TD-SCDMA system with specific embodiments in conjunction with the drawings of the present invention. The signal speed of the TD-SCDMA system in this emb...
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A method and device for downlink synchronization tracking are provided by the present invention. The method includes the following steps: the Downlink Synchronization (SYNC-DL) code in the Downlink Piloting Time Slot (DwPTS) of each subframe is obtained, and the obtained SYNC-DL code data segment is correlated with the SYNC-DL code local to the User Equipment (UE) to obtain the Delay Profile (DP) values; the Power Delay Profile (PDP) values are calculated according to the DP values; Infinite Impulse Response (IIR) filtering is performed on the PDP values of each subframe, and the filtered PDP values are stored; the peak value of the PDP values of each subframe is searched for, and the position of the peak value is output. The present invention can guarantee that the position of the frame head can be captured exactly when the UE moving speed is changed among the static state, the slow speed and the high speed, so the downlink synchronization requirement is satisfied.
Description
technical field [0001] The invention relates to the technical field of Code Division Multiple Access (CDMA, Code Division Multiple Access), in particular to a downlink synchronous tracking method and device. Background technique [0002] In a Time Division Synchronous Code Division Multiple Access (TD-SCDMA, Time Division Synchronous Code Division Multiple Access) system, an uplink channel and a downlink channel work on the same frequency but in different time slots. For user equipment (UE, User Equipment), there may be mutual interference between the uplink channel and the downlink channel, and at the same time, there is also interference between different cells, and better synchronization technology is required to ensure the communication quality of the TD-SCDMA system. [0003] In practical applications, the UE may be in a static, slow-moving or high-speed moving scenario. When standing still or moving slowly, such as in indoor or walking scenarios, the UE's downlink syn...
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IPC IPC(8): H04B7/26H04B1/7073H04B1/707
CPCH04B1/7085
Inventor 梁立宏
Owner SANECHIPS TECH CO LTD