Abstract
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.
Original language | English |
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Article number | 6646517 |
Pages (from-to) | 2225-2228 |
Number of pages | 4 |
Journal | IEEE Communications Letters |
Volume | 17 |
Issue number | 12 |
DOIs | |
Publication status | Published - 1 Dec 2013 |
Keywords / Materials (for Non-textual outputs)
- complexity reduction
- multi-user MISO
- sphere encoding
- Vector perturbation