with OFDM based system is the high value of Peak-to-Average Power Ratio (PAPR) of the transmitted signals. In this work, an improved nonlinear companding technique has been proposed that can transform the Gaussian distributed OFDM signals into the set of threshold based uniform distributed signals while

the companding based techniques for single user OFDMA systems. We have tried our simulations for L=1-4 oversampling rate and 256 FFT matrix and 128 random data bits to decrease the PAPR by overlooking on the complementary cumulative distribution function. It is observed in the simulation that Peak to Average

Rate (BER) performance degradation. A number of approaches have been proposed to deal with the PAPR problem. In this paper, PAPR reduction in OFDM systems is based on combining Low-Density Parity Check (LDPC) codes and Discrete Cosine Transform (DCT) with companding technique. Thus the proposed scheme

High Peak to Average Power Ratio (PAPR) of the transmitted signal is a serious problem in multicarrier modulation systems. In this paper a new technique for reduction in PAPR of the Multicarrier Code Division Multiple Access (MC CDMA) signals based on combining the Discrete Transform either

A combined model of Partial Transmit Sequence (PTS) and a Companding Transform is proposed to reduce Peak-to-Average Power Ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM). Simulation results demonstrate that the proposed scheme can substantially offer better PAPR reduction and BER

have used combination of companding technique with FEC coding to reduce PAPR within OFDM systems. Performance evaluation is carried out in terms of CCDF(Complementary Cumulative Distribution Function) & BER(Bit Error Rate).

Abstract—This paper addresses the problem of peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. It also introduces a new PAPR reduction technique based on adaptive square-rooting (SQRT) companding process. The SQRT process of the proposed technique

Use of companding for peak-to-average-power ratio (PAPR) control is explored for a link involving a non-linear transmit power amplifier with orthogonal frequency division multiplexing (OFDM). Specifically, the objective of the study was to determine if companding using u-law compression

Transmit Sequence (PTS) and high BER for the method of μ-law companding transform, an algorithm of PAPR reduction based on improved μ-law companding transform and PTS technology is put forward in the paper. Simulation results show that the proposed algorithm compared with the original algorithm has

-tion are among the favorite properties of OFDM. Even though there are many advantages of OFDM, it has two main drawbacks: high Peak to Average Power Ratio (PAPR) and frequency offset. In this pa-per, the issue of PAPR in OFDM is discussed. Two new algorithms are proposed to reduce the PAPR. The first algorithm