论文部分内容阅读
针对码速率为 1/3、编码存储级数为 m的 Turbo码 ,研究了 3种栅格终止方案 :传统的单归零栅格终止方案 ,作者提出的前 m尾交织双归零栅格终止方案和第三代移动通信系统 (3GPP)推荐采用的无尾交织双归零栅格终止方案 . Turbo码的译码采用软输出维特比算法 (SOVA) .从译码原理出发 ,对 3种栅格终止方案的设计、译码性能及编码效率进行了分析和比较 ,并通过仿真给出了分别采用 3种栅格终止方案的 Turbo码的误码率曲线 .仿真结果表明 ,前 m尾交织双归零栅格终止方案具有最低的误码率底限 .
For the Turbo codes with a code rate of 1/3 and a coding storage sequence of m, three kinds of grid termination schemes are studied: the traditional one-to-zero grid termination scheme, Scheme and the tailless interleaving bi-directional zero-grid termination scheme recommended by the 3rd Generation Mobile Communications System (3GPP). The decoding of Turbo codes uses the soft-output Viterbi algorithm (SOVA) .From the decoding principle, The design, decoding performance and coding efficiency of the end-of-line scheme are analyzed and compared, and the error rate curves of Turbo codes using three kinds of grid termination schemes are respectively given by simulation.The simulation results show that the first m- The zero-grid termination scheme has the lowest error rate floor.