Coarse synchronization method of wireless terminal

Abstract

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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Problems solved by technology

[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:

If the wireless terminal is performing coarse synchronization detection at this time, the calculated R j (n) A strong peak will appear on the edge of the time slot transmitted by other wireless terminals, resulting in inaccurate detected synchronization positions

[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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