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Hybrid Vector Perturbation Precoding: The Blessing of Approximate Message Passing. (arXiv:1710.03791v1 [cs.IT])
来源于:arXiv
Vector perturbation (VP) precoding is a promising technique for multiuser
communication systems operating in the downlink. In this work, we introduce a
hybrid framework to improve the performance of lattice reduction (LR) aided
(LRA) VP. Firstly, we perform a simple precoding using zero forcing (ZF) or
successive interference cancellation (SIC) based on a reduced lattice basis.
Since the signal space after LR-ZF or LR-SIC precoding can be shown to be
bounded to a small range, then along with sufficient orthogonality of the
lattice basis guaranteed by LR, they collectively pave the way for the
subsequent application of an approximate message passing (AMP) algorithm, which
further boosts the performance of any suboptimal precoder. Our work shows that
the AMP algorithm in compressed sensing can be beneficial for a lattice
decoding problem whose signal constraint lies in \mathbb{Z} and entries of the
input lattice basis not necessarily being i.i.d. Gaussian. Numerical results
show that the 查看全文>>