A Low-BER Clipping Scheme for PAPR Reduction in STBC MIMO-OFDM Systems

Authors:
Xiaodong Zhu
Affiliations:
National Key Lab of Communication, University of Electronic Science and Technology of China, Chengdu, China 610054
Venue:
Wireless Personal Communications: An International Journal
Year:
2012

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Abstract

Clipping is a simple scheme to reduce the peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. Further, it can be extended to space-time block coding (STBC) multiple-input multiple-output (MIMO) OFDM systems for the PAPR reduction. In the conventional clipping schemes for STBC MIMO-OFDM systems, the input symbols are first encoded and then clipped. In this paper, a new scheme is proposed, where the clipping operation is performed before space-time block coding. We theoretically prove that the proposed scheme has better bit-error rate (BER) performance while maintaining the same PAPR reduction as the conventional schemes. Additionally, we derive the symbol-error rate (SER) and BER expressions for the new scheme over multipath fading channels. The simulation results show a good match with our analysis.