Labeling maps affecting the performance of bit-interleaved coded modulation with iterative decoding ( BICM-ID) system were investigated, and a new labeling map called the defined region optimum symbol map ( DRO), which satisfies performance requirement in a given SNR region, was proposed. 重点研究了对比特交织编码及迭代译码(BICM-ID)系统性能影响较大的信号标识映射方法,提出了一种满足给定区间性能要求的最佳映射(DRO)的设计方法。