分集技术在水声跳频通信中的应用  

Application research on diversity technique in underwater acoustic frequency hopping communication system

作　　者：张维全 岳玲[2] 王明洲[2] 

机构地区：[1]水声对抗技术重点实验室,广东湛江524022 [2]西安精密机械研究所,陕西西安710075

出　　处：《舰船科学技术》2012年第11期117-121,共5页Ship Science and Technology

摘　　要：研究了等增益合并频率分集M进制频移键控快跳频(FFH/MFSK)系统和编码M进制频移键控慢跳频(SFH/MFSK)系统在水声多途衰落信道中的性能,给出了频率2重和3重分集FFH/MFSK系统,以及采用(2,1,3)卷积码与(3,1,3)卷积码联合比特交织编码调制(BICM)的SFH/MFSK系统误比特率性能曲线,并进行了比较分析。仿真结果表明,FFH/MFSK提供的频率分集以及信道编码FH/MFSK所提供的时频隐分集都可以有效抵抗水声信道的时频双选择性衰落。但在相同编码效率下,基于BICM与软判决译码的信道编解码方式比快跳频显分集方式能提供更大的分集阶数,从而具有更优的抗衰落性能。The performance of fast frequency-hopping M-ary frequency shift keying modulation （FFH/MFSK） system with equal gain combing frequency diversity and coded slow frequency-hopping M-ary frequency shift keying modulation （SFH/MFSK）system in underwater multipath fading channel is investigated, the bit error rate performance curve of dual, triple frequency diversity FFH/MFSK system and coded SFH/MFSK system using bit interleaved code modulation（BICM） combined with （2, 1, 3）, （3, 1, 3） convolution code respectively is presented, also the comparison the two system is given. Simulation results show that： both of the frequency diversity gain provided by FFH and the time-frequency diversity gain provided by channel coding can combat the underwater acoustic channel＇s time-frequency double fading effectively, but the BICM combined with soft decision decoding method can provide higher diversity order than FFH under the same coding rate, so have stronger anti-fading capacity.

关 键 词：水声信道 快跳频 频率分集 等增益合并 卷积编码 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]