基于信道估计的判决反馈均衡器在时变水声信道中的应用研究

发布时间：2018-01-09 22:10

本文关键词：基于信道估计的判决反馈均衡器在时变水声信道中的应用研究　出处：《南京大学学报(自然科学)》2015年S1期 　论文类型：期刊论文

【摘要】：基于信道估计的自适应判决反馈均衡器,简称CE-DFE均衡器,能根据信道估计结果自适应更新判决反馈均衡器的前馈和反馈抽头系数,具有较强的信道跟踪能力.将CE-DFE均衡器应用水声相干通信,研究了其在非时变和时变浅海水声信道中的均衡效果,比较了其与传统的最小二乘回归-判决反馈均衡器(RLS-DFE)的性能差异.仿真表明:在非时变浅海水声信道中,两种均衡器的性能基本相同,在所研究的信道中,信噪比大于10dB时,输出误比特率小于10~(-3);在时变浅海水声信道中,CE-DFE均衡器由于能根据信道参数自适应调节判决反馈均衡器的参数,其性能优于RLS-DFE均衡器.
[Abstract]:The adaptive decision feedback equalizer based on channel estimation, referred to as CE-DFE equalizer, can adaptively update feedforward and feedback tap coefficients of decision feedback equalizer based on channel estimation results. CE-DFE equalizer is applied to underwater acoustic coherent communication to study its equalization effect in time-varying and time-varying shallow water acoustic channels. The performance of the equalizer RLS-DFE is compared with that of the traditional RLS-DFE equalizer. The simulation results show that the performance of the two equalizers is basically the same in time-invariant shallow water acoustic channels. In the studied channel, when the SNR is greater than 10dB, the output bit error rate (BER) is less than 10U / 3N; The performance of CE-DFE equalizer in time-varying shallow water acoustic channel is superior to that of RLS-DFE equalizer because it adaptively adjusts the parameters of decision feedback equalizer according to channel parameters.
【作者单位】：厦门大学海洋与地球学院;厦门大学水声通信与海洋信息技术教育部重点实验室;
【基金】：国家自然科学基金(41276038)
【分类号】：TN929.3;TN911.5
【正文快照】： 水声信道具有强多途和大的时延,是最为复杂的无线信道之一[1].为了对抗多途传输引发的码间干扰(ISI),相干水声通信接收机通常需要进行自适应均衡.常用的自适应均衡器有线性均衡器和判决反馈均衡器.由于能利用先前判决消除已检测符号在当前待检测符号上所产生的ISI,判决反馈均

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