Low Complexity PTS and SLM Techniques on PAPR Reduction in SFBC MIMO-OFDM Systems

Abstract

MIMO-OFDM is an attractive technique for higher data rate transmission and even for fading channels. The signals suffer from high PAPR; it is the drawback of MIMO-OFDM. For ease of accessibility, the MIMO-OFDM systems are employed with SFBC. To reduce the PAPR, the traditional PTS scheme employ directly to every transmitter, but high computational complexity is associated with it. In this paper, the proposed PTS schemes and SLM scheme with QPSK and QAM modulated data are divided into several pairs of blocks based on the way in which original data is divided at two antennas and how each pair of sub-block is modified to generate distinguish pair of new sub different blocks. Thus obtained new sub different blocks are clubbed to induce PTS containing same structure and the diverse potential as of the SFBC. Later, selected sequences having the smaller PAPR are selected and transmitted. Simulated results show, the Type-I PTS scheme and SLM scheme with QPSK modulated data signal have almost similar result which achieves superior PAPR response and Bit Error Rate response when correlated with other schemes with QAM and QPSK modulated signals. Keywords: Peak to Average Power Ratio - PAPR, Partial Transmit Sequences - PTS, Selected Mapping Sequence - SLM, Spatial Frequency Block Code - SFBC