BER analysis of PAPR reduction techniques in SFBC OFDM system: A review

The OFDM gives high data rate but it has disadvantage of high Bit Error Rate and high Peak-to average power ratio (PAPR). Space frequency block coded OFDM system (SFBC-OFDM) has overcome drawback of high BER because of its full transmission diversity with higher capacity. But large Peak to average Power ratio (PAPR) of OFDM and SFBC OFDM system is amplify signal non linearly and it degrade performance of system in terms of bit error rate(BER). There are different PAPR reduction techniques available to overcome large PAPR But these PAPR reduction technique reduce PAPR by paying cost bit error rate. Proposed paper gives comparative study of different PAPR scrambling technique with respect to BER calculation.

I. Introduction

A strong demand of advanced wireless techniques required for the growth of mobile communications and wireless Internet access. The evolution of Fourth Generation(4G) increases challenges of Wireless communication design due to the unfavourable characteristics of wireless environments, such as co-channel interference, multipath fading, Doppler Effect, and requirement of increased speed of data transmission to provide multimedia facilities, high spectral efficiency and many more. Multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) becomes the most promising technology combination for present and future wireless communications [1]. Recently, Multiple input multiple output (MIMO) Orthogonal frequency division multiplexing (OFDM) with space frequency block code (SFBC) has paying attention because it is robust to time selective fading channels. The SFBC system generates orthogonal codes across two antennas and over two adjacent subcarriers instead of two consecutive symbol intervals and therefore becomes robust against fast fading distortion in frequency nonselective fading environments. However, SFBC MIMO-OFDM signal also inherit disadvantage like in OFDM techniques is high peak-to-average power ratio