Tomlinson-Harashima precoder with tilted constellation for reducing transmission power
IEEE Transactions on Wireless Communications
Iterative channel and data estimation: framework and analysis via replica method
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 4
Throughput of precoded broadcast transmission with noisy feedback
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 1
A new signaling scheme for large DS-CDMA channels without CSI
WiOPT'09 Proceedings of the 7th international conference on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks
On asymptotic performance of iterative channel and data estimation in large DS-CDMA systems
WiOPT'09 Proceedings of the 7th international conference on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks
Performance of vector perturbation multiuser MIMO systems with limited feedback
IEEE Transactions on Communications
On convex vector precoding for multiuser MIMO broadcast channels
IEEE Transactions on Signal Processing
Analysis on codebook based precoding and eigen based beamforming in UTRAN LTE
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
On overloaded vector precoding for single-user MIMO channels
IEEE Transactions on Wireless Communications
How much training is needed for iterative multiuser detection and decoding
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Sum rates and user scheduling for multi-user MIMO vector perturbation precoding
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
BER performance of multibeam satellite systems with Tomlinson-Harashima precoding
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Sum rates, rate allocation, and user scheduling for multi-user MIMO vector perturbation precoding
IEEE Transactions on Wireless Communications
IEEE Journal on Selected Areas in Communications - Special issue on cooperative communications in MIMO cellular networks
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This paper studies a nonlinear vector precoding scheme which inverts the wireless multiple-input multiple-output (MIMO) channel at the transmitter so that simple symbol-by-symbol detection can be used in lieu of sophisticated multiuser detection at the receiver. In particular, the transmit energy is minimized by relaxing the transmitted symbols to a larger alphabet for precoding, which preserves the minimum signaling distance. The so-called replica method is used to analyze the average energy savings with random MIMO channels in the large-system limit. It is found that significant gains can be achieved with complex-valued alphabets. The analysis applies to a very general class of MIMO channels, where the statistics of the channel matrix enter the result via the R-transform of the asymptotic empirical distribution of its eigenvalues. Moreover, we introduce polynomial-complexity precoding schemes for binary and quadrature phase-shift keying in complex channels by using convex rather than discrete relaxed alphabets. In case the number of transmit antennas is more than twice the number of receive antennas, we show that a convex precoding scheme, despite its polynomial complexity, outperforms NP-hard precoding using the popular Tomlinson-Harashima signaling.