摘要
本文对正交频分复用(OFDM)系统频率选择性衰落信道中,信道状态信息(channel state information简称CSI)确知,以及CSI不能或不必精确估计时的SOVA译码算法进行了研究,给出了OFDM系统频率选择性信道BPSK调制时SOVA译码算法的数学描述.在此基础上,我们提出了两种SOVA译码算法:一种是基于盲信道估计的SOVA算法;另一种是不必训练和信道估计的差分SOVA算法,该算法可以在CSI完全未知的情况下进行可靠的SOVA译码.仿真结果说明该算法具有良好的性能.
Combined with OFDM technique, a mathematical description of the SOVA algorithm for BPSK modulation over frequency-selective channel, in case CSI is perfectly known and unknown, is presented in this paper. Two SOVA algorithms are also proposed. The first algorithm based on blind channel estimation has higher performance and doesn't need training. The second one based on differential detection does not need CSI, training and channel estimation, with small processing delay and less computation complexity. Simulation results show high performance of the algorithms.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2004年第4期544-547,共4页
Acta Electronica Sinica
基金
国家自然科学基金和微软亚洲研究院联合资助(No.60372048)
国家自然科学基金重大项目
863计划重大课题(No.2001AA123031)
高等学校优秀青年教师教学科研奖励计划
教育部科学技术研究重点项目(No.O1162)
关键词
TURBO码
软输出维特比算法
正交频分复用
边沿信息
Algorithms
Communication channels (information theory)
Computational complexity
Computer simulation
Mathematical models
Turbo codes
Wireless telecommunication systems
