Color Noise And Multipath Channel Adaptation Technology For OFDM Communication Systems

Orthogonal Frequency Division Multiplexing(OFDM)technology has the advantages of high spectral efficiency and can effectively resist the multipath effect.It is the main high-speed data transmission technology.Now it is one of the hot spots in the research.In OFDM communication system,the channel characteristics will directly affect the signal transmission,also the performance of the system will also be affected.Because of the color noise and multipath effect,the complexity of the channel increases.The signal transmission in a complex channel is distorted by a lot of interference.Therefore,it is of great significance to study the color noise and multipath channel adaptation technology of OFDM communication system.In order to realize the high-speed and reliable transmission of OFDM communication,this paper takes the OFDM communication as the research object.The channel adaptation technology of color noise channel and multipath fading channel is studied.Firstly,this paper introduces the basic principle of OFDM,builds the model of OFDM communication system,and analysis how the cyclic prefix,modulation and demodulation,equalization effects the bit error rate of the system in the OFDM communication system.Secondly,in order to improve the channel adaptation ability of OFDM communication,the characteristics of color noise are analyzed,and the classical whitening filter is introduced.In order to keep the orthogonality of OFDM signal from being damaged,a preprocessing method for OFDM communication is proposed.Finally,in order to overcome the influence of multipath fading effect,a channel adaptive technique for OFDM communication based on Turbo equalization is proposed.The paper studies on the equalizer and decoder algorithm,also the single carrier turbo equalization technique is applied to multi-carrier transmission.The performance of the multi-carrier turbo equalization is verified by comparing the turbo equalization technology with the traditional equalization technology through the simulation experiment.