Reducing the Peak to Average Power Ratio of OFDM Signal through Discrete Cosine Transform-II

Orthogonal Frequency Division Multiplexing (OFDM) is a very attractive technique for high data rate transmission in wireless and wired applications. However, implementation of theOFDM system entails several difficulties. One of the major drawbacks of OFDM is the high peak to average power ratio (PAPR) of the transmitted signals. Several approaches exist toreduce PAPR of OFDM symbols. Precoding is a new method which is having less complexity compared to the other power reduction techniques and also it can reduce PAPR considerablyand results in no distortion. In this paper Discrete Cosine Transform-II precoding technique is proposed. The reduction in PAPR of the OFDM signal is obtained through Discrete CosineTransform-II scheme. The obtained results show that this precoding scheme is an attractive solution to the PAPR problem of OFDM signals.