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A Low-Complexity Sequential Encoder for Threshold Vector Perturbation
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DOI：10.1109/LCOMM.2013.101813.131811.png)
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Abstract
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We propose a sequential encoder for threshold vector perturbation (TVP) precoding in the downlink of K-user multiple input single output (MISO) systems, that introduces complexity savings in the encoding of the data symbols at the base station (BS) transmitter. As opposed to conventional TVP where a thresholded K-dimensional search is carried out to obtain the perturbation vectors that satisfy given signal to noise ratio (SNR) thresholds at the receiver, here we explore a sequential approach that involves the encoding of a subset of transmit symbols L < K to obtain the required vectors. This limits the dimensionality of the associated sphere search, while still obtaining SNR-guaranteeing perturbation vectors. The presented analysis and results show significant complexity savings with the proposed scheme compared to conventional TVP and VP schemes.
Keywords:
Vector perturbation
multi-user MISO
complexity reduction
sphere encoding
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