Frame Expansion Based Peak to Average Power Ratio Reduction in MIMO OFDM Systems

Abstract

The integration of Orthogonal Frequency Division Multiplexing (OFDM) into Multiple Input Multiple Output (MIMO) systems is regarded as a promising technology to provide high performance in fourth generation (4G) broadband wireless communication systems. However, the inherent drawback of large Peak-to-Average Power Ratio (PAPR) for OFDM carries over to MIMO systems. This paper examines the use of Erasure Pattern Selection (EPS) developed for Single Input Single Output (SISO) systems for the task of reducing PAPR in MIMO-OFDM systems. A MIMO-EPS scheme is proposed for minimizing the peak power value over all antennas, which is shown to produce a PAPR reduction gain around 1.5dB for 2 transmit antennas compared with the conventional MIMO-OFDM. The scheme is analyzed to show its significant performance advantages and lower computational complexity compared with an existing SeLective Mapping (SLM) scheme.