The Study Of Adaptive Channel Equalizer In Time-varied Multipath Fading Channel

It has multipath propagation phenomenon in the high speed data mobile communication.which devotes to the rayleigh fading and the frequency selective fading.It makes the propagation character worse,induces waveform distortion.At the same time the higher the transmission speed is, the worse the code interference is.The adaptive equalizer technique can solve the code interference. We can set the adaptive equalizer at the receiver,which can adaptively give the converse character of the channel to reduce the code interference caused by the time-varied multipath propagation character.The adaptive equalizer who doesn't need to increase the transmission power and the bandwidth can real-time improve the transmission quality of the mobile communication.The article discusses the performance of the structure and algorithm of adaptive Equalizer in time-varied multipath fading channel.The performance of wireless communication system is mainly restricted by the quality of wireless mobile channel.Its character has directional effect on the high quality ,high speed data transmission.So the dissertation begins with the character of wireless mobile communication channel and the theory of adaptive filter.Firstly,it analyses the wireless mobile communication propagation environment and gets the characters of time-varied fading channel.Then it analyses the basic theory of adaptive filter, the temporal optimization weight adaptive algorithm and the linear and nonlinear adaptive equalizer. At last it gives the simulation research of linear and nonlinear adaptive equalizer under the 3G micro-cell scenarios.For these we design a 3G practical serial delay propagation environment and variable multipath propagation channels.Based on these descriptions we constitute a systemic simulation model,gain the simulation result and analyze its significance.