Method and apparatus for decoding ZigZag code

Abstract

The invention relates to the communication field and discloses an ZigZag code decoding method and apparatus thereof, which effectively improves the decoding performance of the ZigZag code. In the invention, the MLM decoding algorithm is improved, and the W function obtained by the MLM decoding algorithm is corrected and then used for code decoding, a correction factor is simply multiplied to the W function during correction. The preferred value scope of the correction factor is from 0.5 to 1.0, and the preferred value is 0.8, and 0.75 can also be used as the correction factor, thereby the optimizing can be executed during the hardware process without any time-delay.

Description

ZigZag code decoding method and device technical field The invention relates to the communication field, in particular to the ZigZag code decoding technology. Background technique Channel coding and decoding technology has a relatively independent position in the entire mobile communication system, and is one of its indispensable key technologies, which determines the performance of the mobile communication system. Channel coding and decoding is mainly to reduce the signal propagation power and solve the inevitable signal fading problem in the wireless propagation environment. The Turbo code was first proposed by the Code Division Multiple Access 2000 (Code Division Multiple Access 2000, referred to as "CDMA2000") standard in South Korea and North America. It is used in the channel coding scheme of the third-generation mobile communication system. Other standards such as Code Division Multiple Access (WCDMA for short) have also been adopted in succession. Although Turbo...

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Problems solved by technology

But this algorithm is a simplified algorithm, not the optimal receiving technique

This is because the MLM decoding algorithm adopts the maximum value operation, and when decoding the current single bit, only the contribution of the codeword sequence with the maximum correlation value with the received sequence to the decoding bit is considered (that is, in step 405 W(·) function part), without the contribution of other possible codeword sequences to the decoded bits, so it will lead to the loss of decoding performance, and the loss of decoding performance will increase the bit error rate of the actual system

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