Convex Optimization
Transmit beamforming for physical-layer multicasting
IEEE Transactions on Signal Processing - Part I
MIMO-OFDM wireless systems: basics, perspectives, and challenges
IEEE Wireless Communications
A receive space diversity architecture for OFDM systems using orthogonal designs
IEEE Transactions on Wireless Communications
Pre-DFT Processing for MIMO-OFDM Systems with Space-Time-Frequency Coding
IEEE Transactions on Wireless Communications
Space-time block codes from orthogonal designs
IEEE Transactions on Information Theory
A simple transmit diversity technique for wireless communications
IEEE Journal on Selected Areas in Communications
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Recently, pre-fast Fourier transform (pre-FFT) combining has been introduced for space-time block-coded (STBC) orthogonal frequency division multiplexing (OFDM) systems. Despite the complexity reduction, the resultant signalto-noise ratio (SNR) values of different subcarriers are often not balanced, and it limits the system performance. In this paper, we propose to use the max-min fair criterion for pre-FFT combining in STBC-OFDM systems to solve the problem. Semidefinite relaxation (SDR) is employed to approximate the solution. Simulation results show that the error-rate performance of the proposed pre-FFT combining scheme can be improved as compared with that of the conventional one under various numbers of transmit/receive antennas and multipath channel environments with affordable computational complexity.