基于置零干扰抵消的水声移动多用户通信技术

Underwater acoustic mobile multi-user communication technology based on hyperspace cancellation by coordinate zeroing algorithm

文章对变换域置零干扰抵消算法进行了改进,使其适用于水声移动多用户通信系统,并将置零干扰抵消算法与多通道合并技术相结合,通过引入空间处理增益进一步克服多用户通信系统中的多址干扰。仿真结果表明,该算法在2用户场景,信干比为-10 dB的条件下,能够有效克服干扰用户的干扰,在误码率达到10^(-4)时,其性能曲线与无干扰情况下接收性能曲线相差1 dB左右,与传统串行干扰抵消算法相比,改进后的置零干扰抵消算法在水声移动场景下表现更佳。经过湖试数据测试,在3用户系统中,利用改进后的置零干扰抵消算法使多址干扰得到了有效抑制,期望用户的输出信噪比较处理前提高了约8 dB,证明了该算法的有效性。

In this paper,the hyperspace cancellation by coordinate zeroing(HCC0)algorithm is improved to make it suitable for underwater acoustic mobile multi-user communication systems.The improved HCC0 algorithm combines multi-channel processing and introduces spatial gain to further overcome the multiple access interference(MAI)in multi-user communication systems.Simulation results demonstrate that the proposed algorithm can effectively overcome the interferences from the interfering user in the two user scenario at the signal to interference ratio(SIR)of-10 dB.When the bit error rate reaches 10^(-4),the performance loss is around 1 dB compared with a single user without interference.Compared with the traditional successive interference cancellation(SIC)algorithm,the improved HCC0 algorithm performs better in underwater acoustic moving scenes.The lake test data show that MAI is effectively suppressed by using the improved HCC0 algorithm when the desired user is interfered by two other users at different speeds,and the output signal to noise ratio(SNR)of the desired user is about 8 dB higher than the original data,which proves the effectiveness of the algorithm.