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中文摘要：
在传统频域均衡器的基础上,结合多载波频移键控调制方式的频谱结构,利用接收信号和参考信号的相关性及均衡器的滤波系数,提出了一种兼具均衡与解调功能的新型频域均衡器结构.该均衡器简单、有效地克服了水声信道中多径传播产生的码间干扰和频率选择性衰落等问题,简化了水声通信系统接收机的复杂度. 新型频域均衡器的解调原理以非相关解调算法为基础,但由于利用了均衡器的计算结果,其差错性能优于传统的非相关解调算法,计算机仿真试验表明,改进后的方法使差错性能提高了2 dB;实际水声通信实验表明,该均衡器能够有效地提高水声通信系统的可靠性,具有很好的应用前景.
英文摘要：
In order to overcome Inter-Symbol Interference （ISI） caused by multipath propagation in underwater acoustic channel, a new kind of frequency-domain adaptive equalization has been presented. It is based on the conventional frequency-domain equalization, the peculiarity of MFSK, correlation of received and reference data. It is a new structure with both equalization and demodulation. The results of computer simulation show that there is 2dB enhancement compared with conventional method. The new one are also had a good performance in practical underwater acoustic channel.
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