In this paper, we propose a simple technique for the reduction of high Peak to Average Power Ratio (PAPR), based on Clipping and Differential Scaling, in Orthogonal FrequencyDivision Multiplexing (OFDM) systems. In this technique, the amplitude of complex OFDM signal is clippedand then scaled in such a way so that the PAPR is reduced without causingmuch degradation in bit error rate (BER). We h...

Binary sequences such as chaotic-binary (CB) sequences derived from an iterative chaotic equation have been used in selected mapping (SLM) methods to reduce the peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. Though CB sequences have been shown to produce good PAPR reduction performance, their implementation requires a significant number of compl...

Orthogonal Frequency Division Multiplexing (OFDM) which falls under the multi carrier modulation category. OFDM has gain popularity in number of applications in wireless networks. A very desirable factor in most application is high data rate. Even though OFDM is used as a standard all over the world in order to provide users with high data rates followed by advanced intensive applications wirel...

Partial Transmit Sequences (PTS) is an efficient scheme for Peak-to-Average Power Ratio (PAPR) reduction in Orthogonal Frequency Division Multiplexing (OFDM) system. It does not bring any signal distortion. However, its remarkable drawback is the high computational complexity. In order to reduce the computational complexity, currently many PTS methods have been proposed but with the cost of the...

In this paper, a new and efficient technique is proposed called Tukey Window Pulse shaping technique for the reduction of PAPR in 4G OFDM system. It is based on proper selection of the time-limited waveforms of different subcarriers. Here, only one IFFT is used in the transmitter side instead of several IFFTs for each subcarrier. So this technique is simpler compared to other methods. The imple...

Orthogonal frequency division multiplexing (OFDM) signals have a generic problem of high peak to average power ratio (PAPR) which is defined as the ratio of the peak power to the average power of the OFDM signal. The drawback of the high PAPR is that the dynamic range of the power amplifier and digital-to-analog converter during the transmission and reception of the signal is higher. As a resul...

Being a multicarrier modulation scheme, Orthogonal Frequency Division Multiplexing (OFDM) systems generally produce transmit signals with high Peak to Average Power Ratio or PAPR. Amongst numerous PAPR reduction strategies found in the literature, a relatively new but promising technique is the null and data subcarrier switching method. In this paper, we propose a new approach of null-data subc...

Multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) is a promising candidate for 4G broadband wireless communications. However, one main disadvantage of MIMO-OFDM is that the signals transmitted on different antennas might have large peak-to-average power ratio (PAPR). A new concurrent PAPR reduction algorithm based on the property of orthogonal space-time bloc...

Orthogonal Frequency Division Multiplexing (OFDM) has emerged as a promising modulation technique for high speed optical systems as it reduces intersymbol interference and offers high spectral efficiency. But it has an inherent drawback of high Peak to Average Power Ratio (PAPR) due to multiple subcarriers which makes it sensitive to non linear effects. Different techniques have been proposed f...

The low peak-to-average power ratio (PAPR) in single-carrier systems has motivated the Long Term Evolution (LTE) Third Generation Partnership Project (3GPP) to adopt single carrier frequency division multiple access (SC-FDMA) as the uplink multiple access scheme. In this paper, an enhancement of a SC-FDMA system by decreasing the PAPR is focused. A combination of clipping and Pulse shaping (RRC...