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中文摘要：
本文通过对比特交织迭代译码系统的渐进性能限以及外部信息交换图的分析，研究不同信噪比、卷积编码和映射方式时的系统性能。渐进性能限、外部信息交换图以及计算机仿真都说明：编码方式等一定，反馈后的调和中值与系统的渐进性能成正比；任一标识映射．若输入译码器互信息量大于0．5．则码状态数与渐进性能成正比．反之成反比；信噪比从低到高，迭代次数对系统性能改善满足逐步增加的规律，达到最佳性能所需迭代次数满足先递增其次递减的规律。文章给出了相应数学表达式。
英文摘要：
We consider the performance of bit-interleaved coded modulation with iterative decoding （BICM-ID） with various sets of code and labeling maps. A general theoretical error-free feedback bound （EF Bound） and an extrinsic information transfer （EXIT） chart is used to achieve this, Relationships between the asymptotic bit-error rate and iterative degree under different signals to noise rate （SNR） are studied. EF Bound, EXIT chart and computer simulations which show the harmonic mean after ideal feedback is in proportion to performance with other parameters fixed. Code memory is also proportion to performance with the decoder-inputted mutual information greater than 0.5. With increased SNR, performance improvement over iterative degree increases, and near optimum performance iteration increases before decreases. The corresponding mathematical expressions are developed in this paper.
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