Reducing the Peak to Average Power Ratio of OFDM Signals through Walsh Hadamard Transform

Orthogonal Frequency Division Multiplexing (OFDM) is a very attractive technique for high data rate transmission in wireless and wired applications. However, implementation of the OFDM system entails several difficulties. One of the major drawbacks is the high peak to average power ratio (PAPR) of the transmitted signals. Several approaches exist to reduce 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 considerably and results in no distortion. In this paper Walsh Hadamard Transform precoding technique is proposed. The reduction in PAPR of the OFDM signal is obtained through walsh hadamard transform scheme. The obtained results show that this precoding scheme is an attractive solution to the PAPR problem of OFDM signals.