摘要
将差分正交频分复用(OFDM)水声通信技术与混合激励线性预测语音编码技术相结合,设计并实现差分OFDM水下语音通信系统,使其能够有效地对抗多途干扰,并具有低峰均比、高传输速率等优点,从而能够满足水下语音通信的速率要求。使用不同编码效率的信道编码,对系统的抗干扰能力进行了仿真,得到对应的信噪比和误码率的关系曲线,指出了编码效率的损失可提高系统的鲁棒性。对不同码率卷积码下的差分OFDM水下语音通信进行了湖试研究,并在1/3码率卷积码下比对采用块状导频的OFDM水下语音通信,给出了相应的合成语言效果,验证了系统的有效性和优越性;在不同通信距离上验证了系统的鲁棒性。
The differential Orthogonal Frequency Division Multiplexing（OFDM） technique and mixed excitation linear prediction speech sounds encoding technique are combined in a system.The system could be against multi-interference effectively,it has advantages including low PAPR and high rate,also meets the requirement of underwater speech sounds communication rate.Using channel codes with different coding efficiency in the system,the relation curves of BER versus SNR were given,which show that loss of coding efficiency could improve the robustness of the system.Convolution-code was selected and compared with convolution-code in the differential OFDM system,and pilot-added OFDM system was also compared.The results show the feasibility and utility of the differential system.Meanwhile,the experiment for the differential system under different distances testifies the robustness.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2013年第5期591-597,共7页
Acta Armamentarii
基金
国家自然科学基金项目(51179034
60802060)
中国博士后科学基金项目(2013M531015)
黑龙江省自然科学基金项目(F201109)
上海交通大学海洋工程国家重点实验室开放课题(1007)
水声技术国家重点实验室基金项目(9140C200801210C2001)
哈尔滨工程大学中央高校基本科研业务费专项基金(P223513012)
关键词
声学
水声通信
差分正交频分复用
语音通信
信道编码
aconstics
underwater acoustic communication
differential Orthogonal Frequency Division Multiplexing
speech communication
channel coding
