基于二进制编码多导频搜索的导频设计

Pilot Design based on Binary Code Multi-pilot Search

针对正交频分复用(OFDM)系统中的稀疏信道估计问题,文章提出了一种基于二进制编码的多导频并行搜索导频设计算法。文章所提算法在最小互不相干性(MIP)规则下,通过最小化字典矩阵的相干性来考虑确定性导频设计问题,并要求将导频分配放在有效子载波范围内以实现更实际的目的。导频集在文章所提算法中是二进制编码的。在每次迭代中,将二进制编码段的序列重新组合,以更新近似最优导频位置。某些编码段的更新可以同时改变多个导频位置,既增加了导频的多样性,又降低了计算的复杂度。实验结果表明,与现有导频优化方法相比,文章所提算法可以找到更小的MIP测量矩阵,相应的导频模式可以显著提高信道估计的性能。

To solve the sparse channel estimation problem in Orthogonal Frequency Division Multiplexing(OFDM)systems,this paper presents a pilot design algorithm based on multi-pilot parallel searching and binary coding.Under the Mutual Incoherence Property(MIP),we consider the deterministic pilot design problem by minimizing the coherence of the dictionary matrix.The pilot is also required to be placed within the effective subcarrier range for more practical purposes.In this scheme,the pilot set is binary coded.In each iteration,the sequence of the binary code segment is recombined to update the approximately optimal pilot position.The update of some coding segments can change multiple pilot positions at the same time.It can increase the diversity of pilots,and reduce the complexity of computation.Experimental results show that,compared with the existing pilot optimization methods,this algorithm can find a smaller MIP measurement matrix.Therefore,the corresponding pilot mode can significantly improve the performance of channel estimation.