Downlink distributed antenna systems: Optimal beamforming designs and capacity behavior

Sang Rim Lee, Sung Hyun Moon, Inkyu Lee

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

2 Citations (Scopus)

Abstract

In this paper, we investigate the outage and ergodic capacity of downlink distributed antenna systems (DAS) where each distributed antenna unit (DAU) has multiple antennas with per-DAU power constraint. We first derive the optimal beamforming vector in a closed form by applying a matrix minor condition to relax the positive semi-definite constraint. We observe that our derived solution has a form of maximum ratio transmission per each DAU with full power according to each DAU power constraint. Based on the derived optimal beamforming, the outage and ergodic capacity under Rayleigh fading channels are analyzed. To this end, we show that a distribution of the received signal-to-noise ratio is characterized as a Gamma distribution by approximating a sum of non-identical independent Nakagami-m random variables as a Nakagami-m random variable based on the moment matching method. Then, a formula of the outage and ergodic capacity is presented in a closed form. Simulations confirm that our analysis is accurate and matches well with the simulation results.

Original languageEnglish
Title of host publication2012 IEEE International Conference on Communications, ICC 2012
Pages2151-2155
Number of pages5
DOIs
Publication statusPublished - 2012 Dec 1
Event2012 IEEE International Conference on Communications, ICC 2012 - Ottawa, ON, Canada
Duration: 2012 Jun 102012 Jun 15

Publication series

NameIEEE International Conference on Communications
ISSN (Print)1550-3607

Other

Other2012 IEEE International Conference on Communications, ICC 2012
CountryCanada
CityOttawa, ON
Period12/6/1012/6/15

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Downlink distributed antenna systems: Optimal beamforming designs and capacity behavior'. Together they form a unique fingerprint.

  • Cite this

    Lee, S. R., Moon, S. H., & Lee, I. (2012). Downlink distributed antenna systems: Optimal beamforming designs and capacity behavior. In 2012 IEEE International Conference on Communications, ICC 2012 (pp. 2151-2155). [6364301] (IEEE International Conference on Communications). https://doi.org/10.1109/ICC.2012.6364301