Proceedings of the 2006 international conference on Wireless communications and mobile computing
Majorization and matrix-monotone functions in wireless communications
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Semi-blind algorithms for automatic classification of digital modulation schemes
Digital Signal Processing
Error performance of transmit beamforming with delayed and limited feedback
IEEE Transactions on Wireless Communications
SER analysis and power allocation of OSTBC-OFDM with channel estimation error
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A new THP precoding scheme with effective channel optimization
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
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Wireless Communications & Mobile Computing
A Low-BER Clipping Scheme for PAPR Reduction in STBC MIMO-OFDM Systems
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Adaptive modulation has the potential to increase the system throughput significantly by matching transmitter parameters to time-varying channel conditions. However, adaptive modulation schemes that rely on perfect channel state information (CSI) are sensitive to CSI imperfections induced by estimation errors and feedback delays. In this paper, we design adaptive modulation schemes for multiantenna transmissions based on partial CSI, that models the spatial fading channels as Gaussian random variables with nonzero mean and white covariance, conditioned on feedback information. Based on a two-dimensional beamformer, our proposed transmitter optimally adapts the basis beams, the power allocation between two beams, and the signal constellation, to maximize the transmission rate, while maintaining a target bit-error rate. Adaptive trellis-coded multiantenna modulation is also investigated. Numerical results demonstrate the rate improvement, and illustrate an interesting tradeoff that emerges between feedback quality and hardware complexity.