MIMO Quadrature-OFDMA systems

To alleviate the high peak-to-average power ratio (PAPR), high complexity in user terminal and sensitivity to carrier frequency offset (CFO) problems in current OFDMA systems, a Quadrature OFDM (Q-OFDMA) system has been recently proposed in the single-input single-output environment. In this paper we investigate the realization of multi-input multioutput (MIMO) diversity- and capacity- oriented methods in Q-OFDMA systems. We construct an Alamouti-like spacetime block code (STBC) for Q-OFDMA signal symbols, and investigate the ZF and MMSE equalizers to realize the simple detection for spatial multiplexing (SM) Q-OFDMA systems.