LDPC码在IEEE802.16e标准中的编译码分析

为了能够在保证译码性能的同时进一步降低译码的复杂度,该标准还在译码的过程中引入由M Fossorier等人提出的BP-Based算法,并分析了这两类算法的实际译码性能。实验仿真结果表明,BP-Based算法与LLR-BP算法相比,在不同码长及不同码率条件下可以更好地实现译码算法度和译码性能的有效均衡,因而更加适合作为硬件译码器的优化算法而应用到实际的通信系统中。

Coding and Decoding Algorithms of LDPC Code in IEEE802.16

LDPC code is implemented in IEEE802.16e standard as its channel coding, and adopts one parity check matrix with quasi-diagonal structure to code directly and removes the construction of generator matrix, thus effectively reducing the coding complexity. As for decoding respect, LLR-BP decoding algorithm is selected as standard method, which ensures the excellent decoding performance but suffers the rapid increase in computational complexity. Based on the above considerations, BP-based decoding algorithm proposed by M Fossorier is introduced, and the actual performance of both algorithms is observed carefully in the decoding process. The simulation results show that the BP-hased algorithm in different length and different code rate could achieve fairly effective balance between decoding complexity and decoding performance as compared with LLR-BP algorithm, and thus is more applicable in actual telecommunication system as an optimized algorithm for hardware decoder.