Novel conflict-free interleaver-based low delay parallel Turbo decoding method

Abstract

The invention discloses a novel conflict-free interleaver-based low delay parallel Turbo decoding method, which mainly solves the problem of high decoding delay in MAP algorithms due to iteration and recursive calculation. The method comprises the following steps of: blocking and windowing the received channel information; initializing prior information and state measurement initial values; making a primary soft input and soft output processor (SISO I) and a secondary soft input and soft output processor (SISO II) to synchronously slide forwards to decode; interleaving and de-interleaving the external information generated by the SISO I and the SISO II by using a novel conflict-free interleaver respectively; and when the iteration reaches the maximum iteration times, comparing the obtained likelihood ratio L (xk) with the threshold 0, and performing hard decision to obtain an estimation value of decoding bit. The method has the advantages of low decoding delay, high throughput rate, low performance loss and the like, and can be used for a Turbo decoder of a long term evolution (LTE) receiver.

Description

technical field The invention belongs to the field of wireless communication, and relates to a low-delay parallel turbo decoding method, which can be used for a turbo decoder in a next-generation broadband wireless communication system. Background technique Real-time and high-throughput Turbo code decoding is a core technology in the next generation broadband wireless communication system. Turbo code decoding generally adopts the MAP algorithm. In the decoding process, due to the recursive calculation of state metrics and the iterative exchange of extrinsic information between the two-stage soft-input and soft-output processors (SISO), a larger decoding result is generated. Therefore, the decoding delay must be reduced by modifying the algorithm. At present, the academic community has proposed many low-latency Turbo decoder research results, such as: Hsu J M and other scholars published the article "A Parallel Decoding Scheme For Turbo Codes" on "IEEE International Symposiu...

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Problems solved by technology

However, none of the above-mentioned decoders can realize the real-time transmission of external information between the two SISOs, that is, it does not solve the problem that one of the two SISOs must be idle due to the need to transmit external information between the two SISOs as the prior information of each other. The problem

Therefore, the decoding delay of the traditional decoding method is relatively high, which cannot meet the real-time and high-throughput decoding requirements of the next-generation broadband wireless communication system.

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