Abstract: Multiple input multiple output (MIMO) technique, one of the multicarrier communication systems has become promising characteristics. MIMO with orthogonal frequency division multiplexing (OFDM) constitutes the MIMO-OFDM. This MIMO-OFDM systems faces the problem of non-constant large peaks results in peak-to-average power ratio which is major drawback of multicarrier systems due to which there is reduction in spectral efficiency and increased in system complexity. This paper presents analysis and comparison two PAPR reduction techniques. Selection mapping (SLM) for different route numbers which is one of efficient technique to reduce PAPR when the number of subcarriers is large. Simulation shows that PAPR problem reduces as route number increases. Partial transmit sequence (PTS) technique presents low complexity by applying new phase sequence, Simulation results shows PAPR reduction by PTS method.

Keywords: MIMO (Multiple input multiple output), OFDM (Orthogonal frequency division multiplexing), PAPR (Peak to average power ratio), SLM (Selection mapping), PTS (Partial transmit sequence).