【摘要】 为了进一步抑制多用户滤波多音(FMT)水声通信中的同道干扰和码间干扰，提出了双向干扰抑制的方法．采用双向并行的干扰抑制结构，前向结构用于处理FMT解调后的各子信号，反向结构用于处理各子信号的时间反转形式．前向和反向结构均采用时反技术进行预处理，采用干扰抵消和判决反馈均衡进行后处理，合并双向处理的结果就可以得到用户序列最终的判决值．分析了所提方法的原理，并基于实际的试验数据对所提方法的有效性展开了验证．结果表明：所提方法通过双向处理可以获得额外的分集增益，与传统的单向干扰抑制方法相比，多用户FMT水声通信采用所提方法处理后的误码率和输出均方误差更低，性能更优．更多还原

【Abstract】 To further suppress cochannel interference and intersymbol interference in multiuser filtered multitone(FMT) acoustic communications,a bidirectional interference suppression method was proposed.Two parallel structures for interference suppression were adopted,normal structure was used to deal with each output sub-signal of FMT demodulation and backward structure was used to process the time reversed version of each sub-signal. In normal and backward parallel structures,time reversal technique was used as preprocessing,successive interference cancellation and decision feedback equalization were used as postprocessing,final decision of each user sequence can be obtained by combining the outputs of two parallel processes.The principle of the proposed method was described in detail,and the data collected in an actual experiment was used to verify the validity of the method. The results show that compared with traditional one-way interference suppression methods,the proposed method benefits from the diversity gain achieved by bidirectional processing,which can further reduce symbol error rate and output mean square error in the multiuser FMT acoustic communication,and achieve better performance.更多还原