QAM and PSK codebooks for limited feedback MIMO beamforming
IEEE Transactions on Communications
Performance of vector perturbation multiuser MIMO systems with limited feedback
IEEE Transactions on Communications
Reflected simplex codebooks for limited feedback MIMO beamforming
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Frequency estimation by phase unwrapping
IEEE Transactions on Signal Processing
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This paper presents new low-complexity lattice-decoding algorithms for noncoherent block detection of quadrature amplitude modulation (QAM) and pulse amplitude modulation (PAM) signals over complex-valued fading channels. The algorithms are optimal in terms of the generalized likelihood ratio test (GLRT). The computational complexity is polynomial in the block length; making GLRT-optimal noncoherent detection feasible for implementation. We also provide even lower complexity suboptimal algorithms. Simulations show that the suboptimal algorithms have performance indistinguishable from the optimal algorithms. Finally, we consider block-based transmission, and propose to use noncoherent detection as an alternative to pilot-assisted transmission (PAT). The new technique is shown to outperform PAT.