Method and device for synchronizing wireless communication system

A wireless communication system, a technology for synchronizing positions, applied in transmission systems, digital transmission systems, communication between multiple stations, etc., can solve problems such as high computational complexity, low synchronization probability, and increase

Active Publication Date: 2010-08-04
大唐联诚信息系统技术有限公司
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Problems solved by technology

Since the sliding correlation calculation is performed on all sequences in each frame, the calculation complexity of this method is high. In addition, due to the long search sequence, in the case of low signal-to-noise ratio (signal power is small), the non-synchronized position The probability that the relevant power point is judged as a synchronous position (false alarm probability) and the probability that the synchronous position is not detected (missing detection probability) will increase, resulting in a lower synchronization probability

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  • Method and device for synchronizing wireless communication system
  • Method and device for synchronizing wireless communication system
  • Method and device for synchronizing wireless communication system

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Embodiment Construction

[0039] For a certain terminal A, if a specific terminal B is correctly synchronized when it receives data from terminal A in the current frame, then when terminal A transmits the next frame, terminal B only needs to search a small range near the last synchronization position, based on Based on the above analysis, the present invention proposes a synchronization method for a wireless communication system, which can realize low calculation amount and high synchronization probability, and is especially suitable for scenarios where receiving terminals move.

[0040] see figure 2 , is a schematic diagram of the synchronization scheme of the wireless communication system of the present invention. Compared with the existing scheme, the scheme of the present invention adds a CRC check feedback module, and the complex correlator can determine the search interval of this synchronization according to the CRC check result of the last synchronization In order to reduce the search length, ...

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Abstract

The invention discloses a method and a device for synchronizing a wireless communication system. The method comprises the following steps: receiving a sequence, determining a search interval according to a CRC verification result, and only calculating complex related power values of the search interval; and comparing the complex related power values of the search interval, taking a sequence position corresponding to the maximum complex related power value as a synchronous position, and demodulating the whole frame sequence by using the position as a reference point, wherein the CRC verification result is determined by performing CRC verification on the data demodulated after the last synchronous operation. Compared with the traditional synchronous scheme, the method and the device greatlyreduce the length of the search interval so as to greatly reduce the calculation overhead. Because of the reduction of the search range, the synchronous probability is greatly improved so that the wireless communication system can adapt to the condition of low signal-to-noise ratio.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a synchronization method and device for a wireless communication system. Background technique [0002] In wireless communication systems, synchronization is the basis of all communications, and only accurate synchronization can ensure correct demodulation performance. In the existing communication systems, most of the synchronization algorithms use the local synchronization sequence and the receiving sequence to perform complex correlation to find the maximum peak, and judge the maximum peak point as the synchronization point. A schematic diagram of the synchronization scheme can be found in figure 1 . Its main process includes: step 1, the sequence buffer receives the sequence, where the sequence length is one frame + the length of the synchronization sequence; step 2, the complex correlator performs sliding correlation between the sequence and the local...

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Application Information

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IPC IPC(8): H04B7/26H04B1/707H04L1/00
Inventor 郭义武孙建勋
Owner 大唐联诚信息系统技术有限公司
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