基于基追踪去噪的水声正交频分复用稀疏信道估计
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摘要
针对传统的l_2-范数信道估计精度低的问题,提出了一种基于基追踪去噪(BPDN)的水声正交频分复用(OFDM)稀疏信道估计方法,该方法针对水声信道的稀疏特性,利用少量的观测值即可以很高的精度估计出信道冲激响应。与贪婪追踪类算法相比,基于BPDN算法的稀疏信号估计具有全局最优解,采用l_2-l_1范数准则估计信号,同时考虑了观测值含噪情况,通过调整正则化参数控制估计信号稀疏度和残余误差之间的平衡。仿真分析了导频分布、正则化参数等对BPDN算法的影响以及BPDN算法与LS、正交匹配追踪(OMP)信道估计算法的性能。湖试结果表明,在稀疏信道下,基于BPDN的信道估计方法明显优于LS和OMP信道估计方法。
引文
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