摘要
针对大气激光通信系统的信道特性不稳定问题,为了加强纠错能力和码间抗干扰能力,提出将LDPC码和BICM相结合的编码调制技术应用于大气激光通信。针对大气信道特征建立了不同湍流条件下的信道模型,选取了合适的映射方式,并且在强湍流和弱湍流大气信道下,分别对不同的编码和调制方案进行了仿真分析。仿真结果表明,选取Gray映射的LDPC-BICM技术能够有效地改进系统性能。
In allusion to instability of atmosphere channel in optical communication system, a technique which integrates LDPC coding and bit-Interleaved Coded Modulation is put forward in order to improve the bandwidth efficiency,error correction ability and anti-jamming capability between codes. Aimed at characters of atmosphere channel,an appropriate label mapping is chosen, and the different methods of coding and modulation was analyzed and simulated toward strong turbulence and weak turbulence. The results of simulation proved that the performance of system can be improved effectively by adopting the technology of LDPC-BICM.
出处
《无线电通信技术》
2012年第3期26-28,50,共4页
Radio Communications Technology
