Research And Simulation On The Bussgang Family Blind Equalization Algorithm In Wireless Channel

In the Single-carrier signal transmission process wireless channel, Multi-path propagation and frequency selective fading will seriously affect the efficiency of the transmission system. Therefore, a need to tap into the receiver can adjust or not adjust the filter, which is called the equalizer. Because the characteristics of the channel are often unknown, and will change over the time, so the equalizer is often adjustable tap adaptive equalizer. Conventional adaptive equalizer needs to transmit a known training sequence is used to adjust the equalizer taps before to transmit data to achieve a balanced result. But these training sequences may need to take some bits to reduce the transmission, and it is not suitable for seismic signal analysis and using of military intercept. Adaptive blind equalizer can work without training sequence by using received user signal, thereby increasing the efficiency of the equalizer and scope. This paper proposed a new dual-mode MMA+MDD algorithm and introduced into the T/2 fractionally spaced blind equalizer, based on analysis of traditional adaptive blind algorithm, The simulation prove that the effectiveness of the proposed algorithm , the convergence of high order QAM signal and the tracing capability of mutant channel.