Peak power reduction of space-time coded OFDM signals

Abstract

Peak power reduction in space-time coded orthogonal frequency division multiplexing (OFDM) systems is a challenging task. Most of the current peak power reduction schemes reduce the peak power by manipulating the signal at the final IDFT process. However, in the case of space-time coded OFDM, any processing at this stage would violate the space-time code structure, making its detection at the receiver impossible. The paper shows that selected mapping (SLM) reduces the peak power of space-time coded OFDM signals without violating the space-time code. Reduced peak power of the OFDM signal relaxes the strict dynamic range requirements of the transmitter.