BER performance improvement and PAPR reduction in OFDM systems based on combined DHT and μ-law companding

High peak to average power ratio (PAPR) is a major drawback of orthogonal frequency division multiplexing (OFDM) systems. Among the various PAPR reduction methods, precoded technique and companding transform appear attractive for their simplicity and effectiveness. This paper proposes a new algorithm based on the combination of discrete Hartley transform (DHT) and μ-law companding for PAPR reduction. Theoretical analysis and numerical simulation are presented. Compared with the conventional μ-law companded OFDM system, the proposed algorithm offers an improved bit error rate (BER) and reduces the PAPR effectively for a large companding parameter.