In this paper, a new adaptive PAPR reduction scheme is proposed by which the PAPR of the OFDM signal can be reduced to keep the value lower than a predefined threshold level. A conventional companding is used as a technique to reduce the PAPR of the OFDM signal. If the PAPR of the OFDM signal is higher than any predefined level, one or more times companding operations are performed until the PA...

Orthogonal Frequency Division Multiplexing (OFDM) is one of the techniques against the multipath fading channel for wireless communications. However, the high Peak-to-Average Power Ratio (PAPR) problem of OFDM is a major drawback of multicarrier transmission system which leads to power inefficiency in RF section of the transmitter. This paper presents different PAPR reduction techniques with an...

In this paper we propose the Peak to Average Power ratio reduction (PAPR) in OFDM using adapting coding technique with pre-distortion method to decrease the nonlinear distortion and to improve the power efficiency of the non-linear high power amplifier (HPA). In the proposed method adaptive coding is used for error correction as well as PAPR reduction. The pre-distorter improves the bit error r...

A modified Orthogonal Frequency Division Multiplexing (OFDM) system for robust progressive image transmission is proposed in this paper. A joint source-channel coder (JSCC) is employed in the modified OFDM system. The set partitioning hierarchical trees (SPIHT) used as source coder, and The Low-Density Parity-Check (LDPC) used as a channel coder. The SPIHT coder is modified to generate four dif...

One of the main disadvantages of Orthogonal frequency division multiplex (OFDM) is high peak-to-average power ratio (PAPR). The clipping method of PAPR reduction is analyzed in this article.

Selected Mapping (SLM) and Partial Transmit Sequence (PTS) are two very well-known Peak-to-average Power Ratio (PAPR) reduction techniques for Orthogonal Frequency Division Multiplexing (OFDM) systems. Both these schemes show good PAPR reduction capabilities. However, for any PAPR reduction technique, the nature of spectral occupancy and the associated computational complexity also need to be t...

Orthogonal Frequency Division Multiplexing (OFDM) being a multi-carrier transmission, is one of the most superior technologies in wireless communication. In this paper, a brief overview of an OFDM system is explained. High Peak-to-Average Power Ratio (PAPR) is the major issue associated with an OFDM system, so a novel Partial Transmit Sequence (PTS) technique is proposed for PAPR reduction. The...

Orthogonal Frequency Multiplexing (OFDM) has been increasingly used in modern wired and wireless communication systems due to its high data rate, immunity to noise and high frequency spectral efficiency. The major drawback in using OFDM technique is its high Peak to Average Power Ratio (PAPR). Within the existing PAPR reduction techniques, Selective Mapping is most popularly used Technique. In ...

Orthogonal Frequency Division Multiplexing (OFDM) is a very attractive digital transmission method developed to meet the increasing demand for higher data rates in communications which can be used in both wired and wireless environments. OFDM consist of large number of independent subcarriers, as a result of which the amplitude of such a signal can have high peak values. High peak to average po...

Abstract Peak-to-average power ratio (PAPR) reduction is still an important issue in the next-generation mobile communication networks using higher frequency bands. Recently, we have proposed a PAPR reduction technique called blind selected mapping (blind SLM), which does not require side-information transmission and is able to reduce the PAPR effectively without bit-error rate (BER) degradatio...