电光与控制, 2015, 22 (9): 55, 网络出版: 2021-01-28  

地空通信中基于贪婪算法的SC FDE系统稀疏信道估计

Greedy Algorithm Based Sparse Channel Estimation for SC FDE System in Air Ground Communication
作者单位
空军工程大学信息与导航学院,西安710077
摘要
针对在地空频率选择性衰落信道中,信道冲激响应具有时域稀疏特性的情况,提出了基于贪婪算法的单载波频域均衡(SC FDE)系统稀疏信道估计方法。Chu序列是SC FDE中常用的导频序列,对其进行分析并证明了将Chu序列进行循环移位所构造的导频矩阵满足RIP条件,将导频矩阵作为测量矩阵,把地空信道估计问题建模为稀疏重构模型,采用贪婪算法中的OMP和CoSaMP算法对信道进行稀疏重构,仿真验证了所得信道估计较传统最小二乘(LS)信道估计方法更加准确。在相同的训练序列长度和信道环境下,利用所得信道估计对接收信号进行最小均方误差(MMSE)均衡,蒙特卡罗仿真结果表明,所提方法与传统LS信道估计方法相比,系统误码性能提高2~3 dB。
Abstract
In the air ground frequency selective fading channel, the channel impulse response has the time domain sparse characteristic.In the light of the discovery mentioned above, the greedy algorithm based sparse channel estimation method for Single Carrier Frequency Domain Equalization (SC FDE) system is proposed in this paper.Chu sequence, the pilot sequence commonly used in SC FDE is analyzed, and it is proven that the pilot matrix constructed by the cyclic shift of Chu sequence has satisfied RIP condition.Thus, the pilot matrix is used as a measurement matrix, the air ground channel estimation issue is modeled as a sparse reconstruction model, and sparse reconstruction of the channel is performed with OPM and CoSaMP algorithms of the greedy algorithm.It is verified by simulation that:compared with the traditional Least Squares (LS) channel estimation method, the obtained channel estimation is of higher accuracy.With the same training sequence length and channel environment, the Minimum Mean Square Error (MMSE) equalization of received signal is performed by using the obtained channel estimation.The Monte Carlo simulation results show that compared with the traditional LS channel estimation method, the proposed method can improve the system error performance by 2~3 dB.

王宁, 郭英, 张东伟, 张坤峰, 李红光. 地空通信中基于贪婪算法的SC FDE系统稀疏信道估计[J]. 电光与控制, 2015, 22(9): 55. WANG Ning, GUO Ying, ZHANG Dong-wei, ZHANG Kun-feng, LI Hong-guang. Greedy Algorithm Based Sparse Channel Estimation for SC FDE System in Air Ground Communication[J]. Electronics Optics & Control, 2015, 22(9): 55.

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