T-TCM系统中的SNR失配分析

闫涛; 茹乐; 张曦; 杜兴民

doi:10.3724/SP.J.1146.2007.01044

T-TCM系统中的SNR失配分析

doi: 10.3724/SP.J.1146.2007.01044

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出版历程
- 收稿日期: 2007-06-25
- 修回日期: 2007-11-05
- 刊出日期: 2009-01-19

On SNR Mismatch in T-TCM Systems

摘要

摘要: 该文基于AWGN信道研究了SNR失配对T-TCM系统性能的影响。蒙特卡洛仿真结果表明，SNR欠估计偏差不大于4dB时，T-TCM系统性能基本不受影响，更大的SNR估计偏差则会导致系统性能迅速下降；而SNR过估计始终不会造成系统性能折损。该文结合雅可比对数式及迭代译码算法的特点从理论上给出了解释，进一步提出无需SNR估计的T-TCM译码方案，在保证性能没有损失的前提下降低了T-TCM的应用要求与实现复杂度。
- Turbo网格编码调制;SNR失配;S-Log-MAP算法;雅可比对数式
Abstract: In this paper, impact of SNR mismatch on the T-TCM performance is investigated in AWGN. The Monte Carlo simulation results indicate that when the under-estimate SNR offset is no more than 4dB, the T-TCM performance will not be badly affected, but greater offset can lead rapid performance degradation; Otherwise the overestimate of SNR will never lower the performance. A theoretical explanation is given by analyzing the Jacobian logarithm formula and iterative decoding algorithm, and based on the explanation a new T-TCM decoding scheme without SNR estimation is further proposed, with which the T-TCM systems have no performance loss and can be more conveniently applied and easily implemented.

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