Comparison of partial transmit sequences and selected mapping for peak-to-average power ratio reduction in MIMO OFDM

Multicarrier systems suffer from a high peak-to-average power ratio (PAR) of their transmit signal as large signal peaks lead to power inefficiency of the amplifiers. This issue becomes even more serious in a multi-antenna transmitter. To increase power efficiency, a PAR reduction scheme must be applied at the transmitter. Recently, generalizations of two popular PAR reduction techniques, partial transmit sequences (PTS) and selected mapping (SLM), to multi-antenna systems have been proposed. In this paper, a comparison of these two schemes is accomplished. For that purpose, a point-to-point and a broadcast scenario is assessed. It is shown that under the condition of (almost) same computational complexity, PTS offers significant gains compared to SLM.