基于两级盲均衡的卫星高速数据解调同步算法改进  

A Receiver Baseband Architecture for High-Speed Data Transmission Receiver Based on Two-Stage Blind Equalization

作　　者：吕丽红 LYU Lihong(Beijing Space Information Relay Transmission Technology Research Center,Beijing 100094,China)

机构地区：[1]北京空间信息中继传输技术研究中心,北京100094

出　　处：《航天技术与工程学报》2025年第2期59-66,共8页

摘　　要：在高速数传应用中,盲均衡算法通常在符号级进行,因此其性能取决于符号同步的效果。当信号畸变严重时,接收机无法实现符号同步或符号同步不准确。针对该问题,提出一种基于两级盲均衡的接收机基带结构。该结构在传统符号级盲均衡前增设粗均衡模块,利用2~4倍采样率下的变步长双模式盲均衡算法,实时更新九级滤波器权向量,对信道非线性失真进行预补偿,从而改善符号定时同步精度。仿真结果表明:在信噪比为15、20、25和30 dB时,该结构的稳态均方误差较传统盲均衡分别降低约0.62、1.15、1.89和3.01 dB;实测数据表明,经粗均衡处理后信号星座图明显清晰、帧头锁定稳定、误码率显著下降。所提方法有效提升了系统的定时同步和解调性能,为高速卫星数传系统提供了可靠的工程技术支持。In high-speed data transmission applications,blind equalization algorithms are typically implemented at the symbol level,making their performance highly dependent on symbol synchronization accuracy.When signal distortion is severe,the receiver may fail to achieve proper symbol synchronization or may experience inaccurate synchronization.To address this issue,this paper proposes a receiver baseband architecture based on two-stage blind equalization.In the proposed structure,a coarse equalization module is introduced before the conventional symbol-level blind equalization.Specifically,a variable step-size dual-mode blind equalization algorithm is employed at an oversampling rate of 2 to 4 times the symbol rate,which enables real-time updating of a nine-tapfilter coefficient vector to pre-compensate for nonlinear channel distortions,thereby enhancing symbol timing synchronization accuracy.Simulation results indicate that,at signal-to-noise ratios(SNRs)of 15,20,25,and 30 dB,the proposed architecture achieves steady-state mean square errors(MSEs)approximately 0.62,1.15,1.89,and 3.01 dB lower than those obtained using conventional blind equalization,respectively.Furthermore,practical tests reveal that,after coarse equalization,the signal constellation is significantly clarified,frame header locking is stabilized,and the bit error rate(BER)is substantially reduced.The proposed architecture effectively enhances the timing synchronization and demodulation performance of the system,thereby providing reliable engineering support for high-speed satellite data transmission.

关 键 词：盲均衡 高速数传接收机 粗均衡 信道补偿 

分 类 号：P228.4[天文地球—大地测量学与测量工程] TN911.5[天文地球—测绘科学与技术]