中文摘要：

星座映射方式在BICM系统的设计中非常重要。将外信息传递函数（Extrinsic Information Transfer Function）曲线用于星座映射的设计，用Monte Carlo仿真给出了16QAM星座的几种星座映射方式的外信息传递函数曲线，结合EXIT曲线分析了星座映射方式对系统性能的影响。仿真结果证实了EXIT曲线在星座映射设计中的有效性。

英文摘要：

Labeling map is the crucial design parameter for bit - interleaved coded modulation （BICM） systems. Extrinsic information transfer function （EXIT） chart is introduced to design label mapping. The EXIT charts of several mappings for 16QAM have been studied for both AWGN and Rayleigh channels,and the impact of the mappings on BICM is analyzed. Simulation results verified the effectiveness of EXIT chart.