Selective vector perturbation for low-power small cell MISO downlinks

Christos Masouros, Mathini Sellathurai, Tharmalingam Ratnarajah

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A selective vector perturbation technique is introduced for low-power Small Cell downlink. In contrast to conventional vector perturbation (VP) where the search for perturbation vectors involves all users' symbols, here the perturbation is applied to a subset of the transmitted symbols. This therefore introduces a performance-complexity tradeoff, where the complexity is greatly reduced compared to VP by limiting the dimensions of the sphere search, at the expense of a performance penalty compared to VP. By changing the size of the subset of perturbed users, the above tradeoff can be controlled. We further propose three distinct criteria for selecting which users' symbols to perturb, each of which yields a different performance-complexity tradeoff. The presented analytical and simulation results show that the proposed is most useful in the low-power small cell scenarios where power efficiency levels improved by up to 300% compared to VP are demonstrated.

Original languageEnglish
Title of host publication2014 IEEE Global Communications Conference, GLOBECOM 2014
Number of pages6
ISBN (Print)9781479935116
Publication statusPublished - Dec 2014
Event57th IEEE Global Communications Conference 2014 - Austin, United States
Duration: 8 Dec 201412 Dec 2014


Conference57th IEEE Global Communications Conference 2014
Abbreviated titleGLOBECOM 2014
Country/TerritoryUnited States


  • Complexity reduction
  • Power efficiency
  • Small cells
  • Vector perturbation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications
  • Communication


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