子载波间隔对广义多载波水声扩频性能的影响

针对广义多载波扩频(MC-DS)系统的子载波间隔变化对系统性能的影响,通过将多载波技术和扩频技术相结合的方法,来提高扩频的通信速率和多载波通信的稳健性.广义MC-DS系统可以通过调整子载波间隔,改变扩频增益和频谱交叠程度来应对复杂的水声信道.讨论了在水声多途信道和高斯白噪声信道下该系统随子载波间隔变化的误码性能,根据误码率曲线可以选出使误码率达到最小的最优子载波间隔,从而为系统的最优设计提供了依据.

The influence of the subcarrier interval on generalized multi-carrier underwater acoustic spread spectrum

Due to the fact that the performance of the underwater acoustic spread spectrum communication system using a generalized multi-carrier(MC-DS) is influenced by the change of the subcarrier interval,the combination of the multi-carrier and spread spectrum technology was proposed to enhance the communication speed of the spread spectrum system and improve the robustness of the multi-carrier system.It is convenient for the generalized multi-carrier spread spectrum system to adjust the subcarrier interval,changing the spread spectrum gain and the spectrum overlapping level to cope with the complex acoustic channel.The BER performance of the system which changes with the sub-carrier interval in the acoustic multipath channel and Gaussian white noise channel was discussed in this paper.The best subcarrier interval with the minimum BER was selected according to the BER performance curve,thus providing a basis for the optimal design of the system.