Recently the use of multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems has been proposed for signaling over frequency-selective fading channels. Although various aspects of these systems have been considered in the literature, the problem of the inherent high peak-to-average power ratio (PAPR) is not examined. In this paper, we consider PAPR reductio...

This paper presents a effective iterative piecewise linear companding transform for PAPR reduction. It also presents an efficient iterative procedure of companding. This procedure mainly aims to mitigate the companding distortion that occurs during the clipping operation. This analysis provides a trade off between the reduction in PAPR and BER performance. Simulation results shows that proposed...

Orthogonal Frequency Division Multiplexing (OFDM) is considered to be a promising technique against the multipath fading channel for wireless communications. One of the disadvantages of OFDM is peak to average power ratio (PAPR) problem. In this paper, we analyze a PAPR reduction system which combines a selected mapping technique (SLM) and a deliberate clipping technique. The numerical analysis...

Owing to the high spectral efficiency and the immunity to multipath channels, orthogonal frequency-division multiplexing (OFDM) is a promising technique for high-rate data transmission. But the high Peak-to-Average Power Ratio (PAPR) is one of the main obstacles to limit wide applications. In this paper, we propose a PAPR (peak to average power ratio) reduction method using Partial Transmit Seq...

Orthogonal frequency division multiplexing is an attractive technique for modern wireless communication and has recently been focused in high-data-rate wireless communication research. However, high peak-to-average power ratio (PAPR) of the transmitted signal is a major disadvantage of OFDM. So far, numerous approaches have focused on the PAPR reduction. As one of these approaches, partial tran...

The major setbacks of Orthogonal Frequency Multiplexing (OFDM) is its peak-to-average power ratio (PAPR) and intercarrier interference (ICI). The occurrence of these factors restricts its application. Here, the clipping and filtering PAPR reduction technique is k i n g investigated to reduce the PAPR and out-of-band radiation simultaneously by implementing correlative &g. This paper focuses on ...

It is known that in an OFDM system using Hadamard transform or phase alteration before the IDFT operation can reduce the Peak-to-Average Power Ratio (PAPR). Both these techniques can be viewed as constellation precoding for PAPR reduction. In general, using non-diagonal transforms, like Hadamard transform, increases the ML decoding complexity. In this paper we propose the use of block-IDFT matr...

Orthogonal Frequency Division Multiplexing (OFDM) is considered to be a promising technique against the multipath fading channel for wireless communications. However, OFDM faces the Peak-to-Average Power Ratio (PAPR) problem that is a major drawback of multicarrier transmission system which leads to power inefficiency in RF section of the transmitter. This paper present different PAPR reduction...

Data <span>transmission in orthogonal frequency division multiplexing (OFDM) system needs source and channel coding, the transmitted data suffers from bad effect of large peak to average power ratio (PAPR). Source code codes can be joined using different codes. Variable length error correcting (VLEC) is one these VLEC used mat lab simulation for image transmission OFDM system, compared fi...

High peak-to-average power ratio (PAPR) of the transmitted signal is one of the limitations to employing orthogonal frequency division multiplexing (OFDM) system. This paper considers the use of the tone injection (TI) scheme to reduce the PAPR of an OFDM signal. However, optimal TI (OTI) requires an exhaustive search over all combinations of possible constellations, which is an NP-hard problem...