Peak-to-Average Power Ratio Reduction by Polyphase Interleaving and Inversion for SFBC MIMO-OFDM with Generalized Complex Orthogonal Code

For orthogonal frequency division multiplexing (OFDM) systems, several peak-to-average power ratio (PAPR) reduction schemes have been presented in recent years. For space-time block coding (STBC),Tan et al [2005] proposed a method for reducing PAPR using cross antenna rotation and inversion. To better handle dispersive channel, space frequency block coding (SFBC) MIMO-OFDM is preferred. For such scheme PAPR reduction approach named polyphase interleaving and inversion (PII) was proposed by Zoran and Bar-Ness. It is applied to SFBC MIMO-OFDM based Alamouti scheme with only two transmitting antennas. Extension to the case where more than two transmit antennas and especially the case of four antennas is the main issue of this paper. It employs Tarokh´s generalized complex orthogonal code. As the reduced complexity version of PII, this scheme commonly goes under the abbreviation RC-PII (reduced complexity PII).