卷积码在OFDM水声通信系统中的应用及性能仿真  

Application of Convolutional Code to OFDM Underwater Acoustic Communication System and Performance Simulation

作　　者：朱爱民[1] 贾占彪[1] ZHU Ai-min JIA Zhan-biao(Zhenjiang Watercraft College,Zhenjiang 212003,China)

机构地区：[1]镇江船艇学院,江苏镇江212003

出　　处：《舰船电子对抗》2017年第4期23-27,共5页Shipboard Electronic Countermeasure

摘　　要：在正交频分复用(OFDM)水声通信系统中,信道编码作为关键技术直接影响着系统的性能。为了进一步提高OFDM系统的误码性能,将卷积码应用于OFDM水声通信系统中。考虑了水声通信环境的特点,介绍了卷积码的编译码方式;在AWGN信道下进行了卷积码不同编码率和约束长度情况下的通信误码率Matlab仿真,并在模拟水声信道环境中进行了通信系统仿真试验,通过比较接收端误码率和恢复图像的质量验证了卷积码在OFDM水声通信系统中的性能。In the orthogonal frequency-diversion multiplexing （OFDM） underwater acoustic commu- nication system,as a key technology, channel encoding directly affects the system performance. In order to improve the bit error performance of OFDM system,the convolutional code is applied to the OFDM underwater acoustic communication system. This paper considers the characteristics of underwater acoustic communication environment, introduces the coding and decoding method of convolutional codes,in the AWGN channel communication,performs Matlab simulation of commu- nication error rate with different encoding rate and constraint length ,makes the simulative experi- ment of communication system in the simulated underwater acoustic channel environment, and veri- fies the performance of convolutional code in OFDM underwater acoustic communication system through comparing the error rate of receiving port and the quality of the recovered image.

关 键 词：水声通信 正交频分复用 信道编码 误码率 

分 类 号：TN911.22[电子电信—通信与信息系统]