SC-FDE散射通信系统MMSE-HDFE-RISIC均衡  

MMSE-HDFE-RISIC equalization for SC-FDE scatter communication systems

作　　者：刘刚[1] 庞翔云 陈镇涛 郭漪[1] LIU Gang;PANG Xiangyun;CHEN Zhentao;GUO Yi(State Key Laboratory of Integrated Services Networks,Xidian University,Xi’an 710071,China)

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2022年第5期18-24,共7页Journal of Xidian University

基　　金：国家自然科学基金(62171354)。

摘　　要：对流层散射通信作为一种超视距通信方式,因为保密性强、抗干扰强等,是未来战场的主要通信手段之一。单载波频域均衡技术能够有效解决功放发射峰值功率受限与信号多径衰落问题,在对流层散射通信中广泛应用。然而SC-FDE系统中,频域均衡后的残留码间干扰会严重影响散射通信系统的误码性能。针对这一问题,基于最小均方误差准则,提出了一种适用于SC-FDE散射通信系统的MMSE-HDFE-RISIC均衡算法。该算法基于混合判决反馈均衡算法,通过频域估计残留码间干扰,再时域求和补偿,进一步减少了残留码间干扰对系统性能的影响。仿真分析表明,提出算法在散射信道下具有良好的误码性能。在QPSK调制下,以最小均方差来衡量,频域均衡算法性能提升约2.9 dB,相比传统混合判决反馈均衡算法性能提高约1 dB;在16QAM调制下,频域均衡算法的最小均方差性能提升约1.3 dB,相比传统混合判决反馈均衡算法性能提高约0.6 dB。Tropospheric scatter communication,as an over-the-horizon communication method,is one of the main communication means in the future battlefield because of its high secrecy and interference resistance.Single carrier frequency domain equalization technology can effectively solve the problem of amplifier transmit peak power limitation and signal multipath fading,and is widely used in tropospheric scatter communication.However,in the SC-FDE systems,the residual inter-symbol interference after the frequency domain equalization can seriously affect the bit error rate(BER)performance of the scatter communication systems.To solve this problem,this paper proposes an MMSE-HDFE-RISIC equalization algorithm based on the minimum mean square error criterion for the SC-FDE scatter communication systems.The algorithm is based on the hybrid decision feedback equalization algorithm,which further reduces the impact of residual inter-symbol interference on the system performance by estimating the residual inter-symbol interference in the frequency domain and then summing up the compensation in the time domain.Simulation analysis shows that the proposed algorithm has a good BER performance under the scattering channel.Under QPSK modulation,the performance improvement is 2.9 dB compared to the MMSE frequency domain equalization algorithm and about 1 dB compared to the traditional hybrid decision feedback equalization algorithm.Under 16QAM modulation,the performance improvement is 1.3 dB compared to the MMSE frequency domain equalization algorithm and about 0.6 dB compared to the traditional hybrid decision feedback equalization algorithm.

关 键 词：散射通信 SC-FDE系统 MMSE-HDFE-RISIC均衡 

分 类 号：TN926.4[电子电信—通信与信息系统]