A Parallel Block Decoding Method for LTE Turbo Codes with Low Path Delay

Abstract

The invention discloses an LTE Turbo code parallel block decoding method with low path delay. The LTE Turbo code parallel block decoding method with low path delay mainly solves the problem of a traditional LTE Turbo code parallel block decoding method that path delay is large during the interleave process. The LTE Turbo code parallel block decoding method with low path delay comprises the implementation steps that (1) information flow after demultiplexing is transmitted into a soft input and soft output encoder; (2) each code block in output information flow is divided into n iteration units, and address interleave is conducted on the iteration units; (3) initial addresses of the iteration units are precomputed, and the initial addresses are used for calculating interleave addresses of all the iteration units; (4) information after interleave is fed back to the soft input and soft output encoder, and primary iteration and secondary iteration are conducted on a feedback signal in sequence; (5) de-interleave is conducted on a result after secondary iteration, and a de-interleave result is coded and output after being judged. The LTE Turbo code parallel block decoding method with low path delay reduces path delay and storage resource consumption, and can be applied to an LTE system.

Description

technical field [0001] The invention belongs to the field of wireless communication, relates to a parallel block decoding method of an LTE Turbo code, and can be used in a long-term evolution LTE system. Background technique [0002] In recent years, the high-speed FPGA implementation of Turbo decoding based on the LTE standard has attracted widespread attention. With the continuous improvement of the communication transmission rate, the traditional serial decoding can no longer meet the requirements of the system throughput, and the parallel decoding algorithm has attracted more and more attention in the engineering field. One of the key technologies of decoding. The quadratic permutation polynomial interleaver QPP is widely used in 3GPP LTE Turbo codes due to its advantages of "no conflict" parallel memory access. Scholars and technicians in the industry have been making unremitting efforts to find a way to ensure that the throughput rate of parallel decoding remains unch...

AI Technical Summary

Problems solved by technology

However, since n iteration units do not work at the same time in one clock cycle, the last iteration unit will not start to calculate until the first n-1 iteration units have been processed, so that as the number of blocks increases, the address calculation The path delay of the unit will also increase accordingly

Since the address calculation unit is the key unit of the interleaver, the path delay of the address calculation unit causes the path delay of the parallel block decoding of the entire LTETurbo code to increase

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