Symbol-based processing with balanced subcarrier performance for MIMO-OFDM systems
IEEE Communications Letters
EUC'07 Proceedings of the 2007 international conference on Embedded and ubiquitous computing
Symbol-wise beamforming for co-channel interference reduction in MIMO-OFDM systems
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Analog antenna combining for maximum capacity under OFDM transmissions
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Efficient codebook-based symbol-wise beamforming for millimeter-wave WPAN system
Proceedings of the 2010 ACM international workshop on mmWave communications: from circuits to networks
A general criterion for analog Tx-Rx beamforming under OFDM transmissions
IEEE Transactions on Signal Processing
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The authors present a coded orthogonal frequency division multiplexing (COFDM) system with multiple-input/multiple-output (multiple transmit and/or multiple receive) antennas for high-rate wireless data transmission. A symbol-based space diversity technique, which can take advantage of the inherent space diversity, is proposed. In contrast to conventional subcarrier-based space diversity, it is shown that the proposed technique can be implemented using only one discrete Fourier transform block and the same weighting coefficients for the whole OFDM symbol. This significantly reduces the system complexity while achieving almost the same diversity order as that of the traditional space diversity approach. They also propose an iterative algorithm to obtain the antenna weighting coefficients. Simulation results show that the proposed algorithm converges fast and approaches the global optimal solution for most channel realizations. It is also shown that, when the proposed technique is employed in a time division duplex scenario, where the uplink and downlink channels are reciprocal, the system complexity can be further reduced.