一种LDPC码载波同步方法研究  

Research on a Carrier Synchronization Algorithm of LDPC Codes

作　　者：白立锋[1] 尹茂岱[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2011年第7期24-26,共3页Radio Engineering

摘　　要：针对相干检测或同步解调时产生频率的偏差,结合低密度校验码(LDPC)高性能的译码性能,提出了一种纠正频偏的LDPC码载波同步方法。该方法首先用Cordic算法来求解频偏,然后修正各个符号中由频偏带来的相偏,给出了置信传播译码过程。仿真结果表明,该方法能够将乘法操作简化为移位操作,便于硬件实现,而且可以保证LDPC编码系统的性能接近精确同步情况下的性能。In the communication system,a carrier self-synchronization method combined with the efficacious LDPC decoding performance is presented to solve the frequency deviation caused by the coherent detector or the synchronous demodulator.According to this algorithm,the frequency deviation is figured out by using Cordic algorithm at first,and then the phase deviation of all symbols caused by the frequency warp is modified by using Cordic algorithm again.Simulation results show that not only the multiplicative manipulation is substituted for the shift manipulation,but also the algorithm＇s performance is approaching to the precise synchronous performance.

关 键 词：低密度奇偶校验码 CORDIC算法 置信传播译码算法 载波同步 

分 类 号：TN911.22[电子电信—通信与信息系统]