摘要
水声信道环境恶劣，为了获得更大的分集增益，提出级联编码的MIMO—OFDM水声通信系统，同时提出一种改进的联合迭代接收方案。系统发射端外码和内码分别位于空时编码两侧。提出的改进接收方案在外码硬判决译码后增加反馈结构，利用反馈信息减小MIMO检测的次数，同时改善内码译码初始软信息。对级联编码系统在三种接收方案下的性能进行仿真，并与独立编码系统对比。仿真结果表明，改进方案能够获得更大的性能增益，同时显著地减少MIMO检测的运算量。另外，信噪比较高时，相同系统码率的级联编码系统误码性能优于独立编码系统。
The underwater acoustic channel is the most complex channel. In order to achieve significant diversity gain in the underwater acoustic channel, a BCH-LDPC coded Multi In Multi Out-Orthogonal Frequency Division Multiplexing （MIMO-OFDM） underwater acoustic system is developed and an improved receiver is proposed for the system. In the system, the outer and inner encoders are separated by the V-BLAST encoder in the transmitter. The improved receiver is based on the joint iterative detection and decoding algorithm. A portion of information is feedback from the outer decoder to reduce the operation times of the MIMO detection and improve the reliability of the initial soft information. The performance of the system using three different receivers is analyzed by simulation. Results show that the improved receiver can obtain more performance gain and the computational complexity is significantly lower. Besides, when the system coded rates are the same, the performance of the BCH-LDPC coded system it better than that of the separate coding system at high Signal-to-Noise Ratio （SNR）.
出处
《吉林大学学报：工学版》
EI
CAS
CSCD
北大核心
2014年第4期1171-1176,共6页
Journal of Jilin University：Eng and Technol Ed
基金
基金项目：“十一五”国防预研基金项目.
关键词
通信技术
水声通信
多输入多输出系统
正交频分复用
级联编码
communication
underwater acoustic communications
multiple input multiple output （MIMO）
orthogonal frequency-division multiplexing （OFDM）
concatenated coding
