比特交织编码调制技术在卫星通信中的应用

针对卫星移动通信信道频带和功率均受限的特点,将比特交织编码调制（BICM）技术应用到卫星通信系统,通过编码和高阶调制的结合,利用状态的记忆和适当的映射来增大码字序列之间的距离,进而提高编码增益,在保证系统频带利用率的同时,有效地提高了其功率利用率。在对卫星信道特点分析的基础上进行卫星信道建模,并分别在高斯（AWGN）信道、莱斯（Rice）信道和瑞利（Rayleigh）信道下对系统性能进行仿真,仿真结果证明了该种编码调制方式在卫星信道中的有效性。

Bit-interleaved Coded Modulation Technology Applied to the Satellite Communications System

Aiming at the fact that both of the channel bandwidth and the power resource are limited,Bit-Interleaved Coded Modulation（BICM）is introduced in mobile satellite communications system. By combining the coding and higher order modulation,the state memory and the proper mapping are used to enlarge the distance between code sequences and then the coding gain is improved. In this way,the efficiency of the power is enhanced and the bandwidth efficiency is guaranteed simultaneously. The satellite channel is set up based on the analysis of the channel characters. The system performance is simulated in AWGN channel,Rice channel and Rayleigh channel separately,and the results show that BICM is effective in satellite channels.