Decoupled search for vector perturbation in multiuser downlink systems

Seok Hwan Park, Hyeon Seung Han, Inkyu Lee

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

2 Citations (Scopus)


In this paper, we propose a new vector perturbation scheme which reduces the complexity associated with finding perturbation vectors by searching for the real and imaginary components individually. To minimize a performance loss induced from decoupling joint search, we apply diagonal precoding at the transmitter whose phase angles are iteratively optimized according to the criterion of maximizing the chordal distance between subspaces spanned by the real and imaginary components. Since our main objective is to reduce the system cost, we also propose a simple non-iterative method of finding phase angles with slight performance loss. Simulation results show that the proposed decoupled vector perturbation reduces the average number of search candidate by 56% in comparison to the original vector perturbation in 4-by-4 system. It is also noted that the simple choice of phase angles provides the performance almost identical to that of the iteratively optimized angles. Moreover, we develope a receive antenna combining method for the vector perturbation systems with multiple-antenna receivers. The proposed algorithm designs receive combiners based on the criterion of optimizing the performance metric via a block-coordinate ascent approach.

Original languageEnglish
Title of host publication2010 IEEE International Conference on Communications, ICC 2010
Publication statusPublished - 2010
Event2010 IEEE International Conference on Communications, ICC 2010 - Cape Town, South Africa
Duration: 2010 May 232010 May 27

Publication series

NameIEEE International Conference on Communications
ISSN (Print)0536-1486


Other2010 IEEE International Conference on Communications, ICC 2010
Country/TerritorySouth Africa
CityCape Town

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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