the destructive impact of fading environments and also bandwidth limitations are two main challenges which communication is dealing with them. these challenges can affect on the growth of wireless communication and even cause reliable communications and high data rate to be prevented. thus, ofdm (orthogonal frequency division multiplexing) modulation by using of fast calculation hardwares such ...

Orthogonal Frequency Division Multiplexing (OFDM) is a very attractive technique for high data rate transmission in wireless and wired applications. However, implementation of the OFDM system entails several difficulties. One of the major drawbacks is the high peak to average power ratio (PAPR) of the transmitted signals. Several approaches exist to reduce PAPR of OFDM symbols. Precoding is a n...

In multicarrier systems, the transmitted timedomain signal exhibits large amplitude peaks. This peak-toaverage power ratio (PAPR) problem complicates the practical use of multicarrier systems: the amplifier used to transmit the signal saturates because of the large peaks and causes non-linear distortion. As this non-linear distortion frustrates severely the detection of the multicarrier signal,...

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...

Abstract High Peak to Average Power Ratio (PAPR) of transmitted signal is one of the major drawbacks of the complex wavelet packet modulation (CWPM). Utilizing the advantage of concentrating the energy to certain subspaces of the discrete wavelet transform, the performance of three methods to reduce PAPR in CWPM are investigated. These are: threshold method, clipping method and a proposed hybri...

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 widely used in many digital communication systems due to its advantages such us high bit rate, strong immunity to multipath and high spectral efficiency but it suffers a high Peak-to-Average Power Ratio (PAPR) at the transmitted signal. It is very important to deal with PAPR reduction in OFDM systems to avoid signal degradation. Currently, th...

This paper describes the nyquist filter based technique to reduce the peak to average power ratio (PAPR) in multiple input multiple output Orthogonal Frequency Division Multiplication (MIMO-OFDM) systems. OFDM-MIMO system faces one of the main problems regarding PAPR of a transmitted signal. In present paper a nyquist filter along with conventional selected mapping (SLM) and alternative multise...

We propose a direct precoding plan for a solitary client numerous input–multiple-yield Orthogonal Frequency Division Multiplexing (OFDM) framework to minimize top to normal force degree (PAPR) by utilizing repetitive spatial assets at the transmitter through a particular worth decay based summed up converse. The proposed precoder focused around the summed up converse is made out of two sections...