A Novel Method of Bussgang-type Blind Equalization in High-order QAM Systems
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摘要: 该文提出一种适用于高阶QAM系统的新Bussgang类多模盲均衡算法。将新的代价函数与星座匹配误差函数结合，给出一种瞬时双模切换混合算法，然后设计了一种基于判决圆的模式切换准则，从而达到进一步有效降低新算法稳态误差的效果。最后，仿真结果以高阶256QAM信号为例，验证了该算法对于高阶QAM信号的盲均衡能力和良好效果。Abstract: A novel multi-modulus method of Bussgang-type blind equalization algorithm in higher-order Quadrature Amplitude Modulation (QAM) systems is proposed. To reduce the steady-state error effectively, an instantaneous switch-mode hybrid algorithm whose associative cost function is formulated by the novel cost function and the Constellation Matched Error (CME) is proposed, and a criterion of circular mode switching decision is designed. Finally, 256-QAM signal is used to simulate, all of these results verify the proposed blind equalization algorithm can achieve good performance in high-order QAM systems.
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