A low-complexity sequential encoder for threshold vector perturbation

Christos Masouros, Mathini Sellathurai, Tharmalingam Ratnarajah

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Article number6646517
Pages (from-to)2225-2228
Number of pages4
JournalIEEE Communications Letters
Volume17
Issue number12
DOIs
Publication statusPublished - 1 Dec 2013

Keywords

  • complexity reduction
  • multi-user MISO
  • sphere encoding
  • Vector perturbation

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