The Research On The Peak Average Power Ratio Of MC-CDMA System

As users’ demands for communication services improving,the next generation mobile communication system will greatly improve the data rate,people have paied more attention to the fourth generation(4G)mobile communication systems.It is proved that CDMA and orthogonal frequency division multiplexing(OFDM)technologies,the MC-CDMA technology in particular,can improve overall system performance,is generally considered as the core solution of the fourth generation mobile communication system.MC-CDMA technology is the combination of OFDM technology and CDMA technology,it inherits the advantages of both technologies,it has a wide range of applications.However,in the succession of the advantages of both technologies over the same time,the technology is inevitably inherit their shortcomings,of which dramatic changes in signal envelope is one of the shortcomings,which will result in high peak power.Therefore,the study of factors affect the changes in the envelope and try to reduce the signal’s peak-average power ratio is an important measure to improve the performance of MC-CDMA system.The first work of this paper is to introduce the basics of this subject,includingthe effect of the peak average power ratio of OFDM system,the impact of reducing the reasons for the peak average power ratio and the necessity of the peak average power ratio factor.The next is to research the peak average power ratio reduction algorithm,focuses on the transfer series in some alternative algorithms and selection of sub-optimal mapping method and the partial transmit sequence method of the fusion algorithm,and simulation analysis of each algorithm...