水声通信中基于软判决的块迭代判决反馈均衡器

发布时间：2018-02-09 03:54

本文关键词： 水声通信单载波频域均衡软判决反馈均衡器迭代信道估计湖上试验　出处：《电子与信息学报》2016年04期 　论文类型：期刊论文

【摘要】：在单载波频域均衡水声通信系统中,混合结构的时-频域判决反馈均衡器(H-DFE)计算复杂度高,不利于实时实现;而基于硬判决的块迭代判决反馈均衡器(HD-IBDFE)存在错误符号判决造成系统性能下降问题,同时需要估计判决符号和发射数据之间的互相关函数。该文对水声通信中基于软判决的块迭代判决反馈均衡(SD-IBDFE)接收机算法进行了研究,通过对均衡器输出信号进行软判决,并将符号软信息进行反馈,提高了系统性能,同时采用迭代信道估计方法来适应水声信道的时变性。通过仿真比较得出,该方法在水声信道条件下明显优于HDIBDFE。对湖上试验数据处理结果表明,在浅水1.8 km通信距离下,单通道无编码QPSK调制可实现310-的误码率并达到3000 bps的有效数据率。
[Abstract]:In the single-carrier frequency domain equalization underwater acoustic communication system, the time-frequency domain decision feedback equalizer (H-DFE) with hybrid structure has a high computational complexity, which is not conducive to real-time implementation. The block iterative decision feedback equalizer (HD-IBDFE) based on hard decision has the problem of system performance degradation caused by error symbol decision. At the same time, it is necessary to estimate the cross-correlation function between decision symbols and transmit data. In this paper, the block iterative decision feedback equalizer (SD-IBDFE) receiver algorithm based on soft decision in underwater acoustic communication is studied, and the output signal of equalizer is soft-adjudicated. The symbol soft information is fed back to improve the performance of the system and the iterative channel estimation method is used to adapt to the time-varying of underwater acoustic channel. The method is superior to HDB DFE in underwater acoustic channel. The experimental data processing results show that the single channel uncoded QPSK modulation can achieve a 310- bit error rate and an effective data rate of 3000 bps at a communication distance of 1.8 km in shallow water.
【作者单位】：西北工业大学航海学院;空军工程大学信息与导航学院;
【基金】：国家自然科学基金(61471298,61271415,61401499)~~
【分类号】：TN929.3

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