PAPR Reduction by using Cooperative PTS for SFBC MIMO-OFDM Systems

Multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) system has been receiving a great attention for high-data-rate transmission. MIMO can be used to improve the performance and increase the capacity of wireless communication systems. OFDM is a popular technology and has been adopted for many new and emerging broadband communication systems including wireless LAN, WIMAX, Digital Video broadcasting and 4G mobile systems. MIMO-OFDM suffers from high PAPR, this demands expensive linear amplifiers with wide dynamic range. In MIMO-OFDM systems, a straightforward way for PAPR reduction is to apply existing techniques separately on each transmit antenna, then the overall PAPR reduction is obtained. For orthogonal frequency division multiplexing (OFDM) system, several Peak-to-average power ratio (PAPR) reduction schemes have been presented in recent years. The conventional partial transmit sequences (PTS) scheme can be applied to each transmitting antenna directly to reduce the PAPR of MIMO-OFDM systems, but it has high computational complexity. To better handle dispersive channel, Space frequency block code (SFBC) MIMO-OFDM is preferred. SFBC is a coding technique used for transmission diversity. In this the antennas are separated by space and subcarriers are separated by frequency and the coding is performed in a block.