Abstract

The main drawback of the OFDM system is high Peak to Average Power Ratio (PAPR), which calls for high power amplifiers in the system. This problem can be mitigated by using Block codes that are Non Transparent. We investigated the potential of the Palindromic codes in reducing the PAPR with the proposed biasing method. Using exhaustive search, a bias vector of n bits is chosen and added to all possible codewords (using modulo-2 addition) such that the maximum PAPR of all these codewords is minimized. For making the number of carriers to be a power of two for efficient IFFT/FFT, Redundant Bits are to be added to the biased code word even though there is a slight degradation in PAPR performance.