Coarse synchronization method of wireless terminal
A wireless terminal, coarse synchronization technology, applied in communication between multiple stations, advanced technology, climate sustainability, etc., can solve problems such as unsatisfactory missed detection performance, affecting missed detection performance, and large false detection probability. Achieve the effect of improving the performance of missing detection, improving the performance of missing detection, and reducing the false detection rate
Active Publication Date: 2014-03-12
SPREADTRUM COMM (SHANGHAI) CO LTD
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[0015] The above-mentioned coarse synchronization detection method not only has unsatisfactory missing detection performance, but also has a high probability of false detection. In the actual network, the following problems will be encountered:
[0018] Again, the calculated R j (n) There may be a large peak on the edge of the slot, and often there will be R on the edge of the slot for some subframes j (n) will be greater than R at the Dwpts position j (n) value, so that in J subframes Pos j The number of subframes with close values is often less than M, resulting in coarse synchronization failure and affecting leak detection performance
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[0037] In the following description, many technical details are proposed in order to enable readers to better understand the application. However, those skilled in the art can understand that without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.
[0038] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.
[0039] The technical scheme of the invention can be applied to wireless communication systems such as TD-SCDMA and LTE. The "power characteristic window period" referred to in various embodiments of the present invention is the transmission period of the signal of the system. For the TD-SCDMA system, the period of the power characteristic window ...
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The invention relates to the field of wireless communication and discloses a coarse synchronization method of a wireless terminal. The method comprises the following steps: using characteristic windows of four regions, and taking the minimum value in normalized power characteristic information of two regions of a and c to be divided by the maximum value of the normalized power characteristic information of the two regions of b and d for obtaining R(n), thereby effectively overcoming the possibility of emerging peak values on time slot edge when calculating the R(n), greatly reducing the false detection rate, improving the missed detection performance and improving the missed detection performance of coarse synchronization by 3db in the practical situation.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to the rough synchronization technology of wireless terminals. Background technique [0002] In communication systems such as Time Division Synchronous Code Division Multiple Access (TD-SCDMA for short) and Long Term Evolution (LTE for short), after the wireless terminal is turned on, it needs to perform cell Detect, and detect the synchronization information of the cell (for example, in TD-SCDMA, it is necessary to detect the synchronization information of the subframe). [0003] In general communication systems, pilot sequences with better autocorrelation and cross-correlation characteristics are included, and wireless terminals can detect cell synchronization information by correlating received information with pilot sequences. Correlation within one cycle (such as one subframe in TD-SCDMA) requires a large amount of calculation, which will increase the power consumption an...
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IPC IPC(8): H04B7/26
CPCY02D30/70
Inventor 沈旭强刘利平曹强刘丰威
Owner SPREADTRUM COMM (SHANGHAI) CO LTD