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目前Turbo码译码算法运算较复杂,无法满足LTE及LTE-Advanced的高速吞吐要求,因此,研究LTE环境下的Turbo码译码算法具有理论意义与工程价值。从降低译码延时考虑,评估各种迭代停止准则对性能及译码效率的影响,在分析外信息统计特性收敛的基础上,设计基于外信息收敛的双门限停止准则。仿真结果表明,改进的迭代停止准则在不影响译码性能的前提下,能较好地提高译码速率。
At present, turbo code decoding algorithm is complicated to meet the requirements of high-speed throughput of LTE and LTE-Advanced. Therefore, it is of theoretical significance and engineering value to study Turbo decoding algorithm in LTE environment. Considering the delay of decoding, the influence of various iteration stop criteria on performance and decoding efficiency is evaluated. Based on the analysis of the convergence of statistical properties of external information, a two-threshold stop criterion based on the convergence of external information is designed. Simulation results show that the improved iterative stop criterion can improve the decoding rate without affecting the decoding performance.