基于LDPC码的分集接收系统性能研究  

Performance Study of the Diversity Reception System Based on LDPC Codes

作　　者：刘加林[1,2] 郝士琦[1,2] 周建国[1,2] 王勇[1,2] 

机构地区：[1]电子工程学院脉冲功率激光技术国家重点实验室,安徽合肥230037 [2]电子工程学院安徽省电子制约技术重点实验室,安徽合肥230037

出　　处：《激光与光电子学进展》2013年第10期67-73,共7页Laser & Optoelectronics Progress

基　　金：青年科学基金(60902017);安徽省自然科学基金(1308085MF83)

摘　　要：为了抑制大气湍流对大气光通信系统性能的影响,将低密度奇偶校验(LDPC)码与多输入多输出技术结合,推导了最大比合并、等增益合并和选择合并三种合并方式下单输入多输出(SIMO)系统译码初始化计算公式,并比较了系统误码性能。仿真结果表明,基于LDPC编码的大气光通信SIMO系统误码性能优于SISO系统;不同的方式下SIMO系统的误码性能不同,信噪比一定时,最大比合并方式的系统误码率最低,等增益合并方式次之;在发射天线数一定时,随着接收天线数增加,系统误码率降低,对大气光通信的系统设计与理论研究具有一定的指导意义。In order to reduce the influence of atmospheric turbulence on the performance of atmospheric optical communication system, low-density parity-check （LDPC） codes combined with multiple-input multipM-output technologies is applied. Decoding initialization formulas of single-input multiple-output （SIMO） system are derived in the forms of maximal ratio combining （MRC）, equal gain combining （EGC） and selection combining, the system bit- error-rate （BER） performances are compared. The simulation results show that the atmospheric optical communication SIMO system of LDPC coding has better BER performance than that in SISO system; error performance of SIMO system differs with different combining schemes; the system in MRC has the lowest bit error rate followed by system in EGC with the same signal-to-noise ratio; with the increasing number of receiving antennas in a certain number of transmitting antennas, the BER will be decreased, So, it has some significance in the design of atmospheric optical communication system and theoretical research.

关 键 词：光通信 分集接收 低密度奇偶校验码 译码初始化 误码率 

分 类 号：TN929.12[电子电信—通信与信息系统]