摘要
针对短波信道数据引导均衡算法(Data-Directed Equalization Algorithm,DDEA)及其判决反馈式DDEA(Decision Feed-back Equalizer DDEA,DFE-DDEA)算法在高低信噪比上误码性能互补的特点,在分析最大似然信噪比估计算法基础上,提出了采用实时信噪比估计以指导信道均衡方式、在DDEA与DFE-DDEA间动态切换的DS-DDEA(DynamicSwitching DDEA)算法,改善误码率整体性能。仿真算法验证了信噪比估计和DS-DDEA算法的可行性和有效性。
DDEA and DFE-DDEA are analyzed in HF chan nel equalization based on MIL-STD-188-110B.According to the BER of the two algorithms being sensitive to SNR and com plementary to each other for high and low SNR,the way of dynamic switching equal ization algorithm between DDEA and DFE-DDEA is put forward,which is guided by t he SNR that is estimated in real-time to reduce BER unitarily.The SNR estimatio n algorithm based on MLSE（Maximum Likelihood Sequence Estimator） and training s equence is realized after HF channel equalization according to Watterson channel model.The simulation validates the feasibility and efficiency of HF channel SNR estimation and dynamic switching channel equalization algorithm.
出处
《无线电工程》
2012年第4期12-14,18,共4页
Radio Engineering
