Advantage of Multichannel Decision Feedback Equalizer on Underwater Acoustic Communication
Advantage of Multichannel Decision Feedback Equalizer on Underwater Acoustic Communication
复制标题
多通道决策反馈均衡器在水声通信中的优势
DOI：
10.1143/jjap.43.3134
复制
发表时间：
2004
影响因子：
1.5
通讯作者：
H. Ochi
中科院分区：
文献类型：
--
作者：
Yoshitaka Watanabe;H. Ochi
通过仿真研究了水声数字通信在多径或多普勒频移等各种可能降低通信性能的失真条件下的性能。使用M序列数据作为传输数据。信号频带为20 kHz±4 kHz，调制方式为16-QAM。接收的数据使用多通道判决反馈均衡器(DFE)进行解调。本文研究了密集多径环境下前馈抽头分配对通信性能的影响。显然，通过利用多路径来提高通信性能，当输入信号的信噪比(SNR)较小时，该优势明显，必须考虑该优势与由大量抽头引起的不稳定性之间的权衡，并且如果曾经存在多普勒频移或较少的多径，则该优势是可用的。
Underwater acoustic digital communication was investigated by simulation under conditions of various distortions which seem to degrade communication performance, such as multipath or Doppler shift. M-sequence data was used as transmission data. The signal band was 20 kHz±4 kHz, and the modulation method was 16-quadrature amplitude modulation (16-QAM). The received data was demodulated using a multichannel decision feedback equalizer (DFE). In this paper, the effect of feedforward tap allocation on communication performance under an intensive multipath condition is considered. It became clear that the communication performance is advanced by utilizing multipaths, that this advantage is distinguished when the signal-to-noise ratio (SNR) of the input signal is small, that it is necessary to consider the trade-off between this advantage and the instability caused by a large number of taps, and that this advantage is available if ever there is Doppler shift or few multipaths.