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 publicationIEEE International Conference on Communications
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

Other

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

Fingerprint

Optimal systems
Beamforming
Antennas
Outages
Random variables
Rayleigh fading
Fading channels
Signal to noise ratio

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications

Cite this

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

Downlink distributed antenna systems : Optimal beamforming designs and capacity behavior. / Lee, Sang Rim; Moon, Sung Hyun; Lee, Inkyu.

IEEE International Conference on Communications. 2012. p. 2151-2155 6364301.

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

Lee, SR, Moon, SH & Lee, I 2012, Downlink distributed antenna systems: Optimal beamforming designs and capacity behavior. in IEEE International Conference on Communications., 6364301, pp. 2151-2155, 2012 IEEE International Conference on Communications, ICC 2012, Ottawa, ON, Canada, 12/6/10. https://doi.org/10.1109/ICC.2012.6364301
Lee SR, Moon SH, Lee I. Downlink distributed antenna systems: Optimal beamforming designs and capacity behavior. In IEEE International Conference on Communications. 2012. p. 2151-2155. 6364301 https://doi.org/10.1109/ICC.2012.6364301
Lee, Sang Rim ; Moon, Sung Hyun ; Lee, Inkyu. / Downlink distributed antenna systems : Optimal beamforming designs and capacity behavior. IEEE International Conference on Communications. 2012. pp. 2151-2155
@inproceedings{90cc8dcc148746059cf00c0f0cf6cb5f,
title = "Downlink distributed antenna systems: Optimal beamforming designs and capacity behavior",
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.",
author = "Lee, {Sang Rim} and Moon, {Sung Hyun} and Inkyu Lee",
year = "2012",
month = "12",
day = "1",
doi = "10.1109/ICC.2012.6364301",
language = "English",
isbn = "9781457720529",
pages = "2151--2155",
booktitle = "IEEE International Conference on Communications",

}

TY - GEN

T1 - Downlink distributed antenna systems

T2 - Optimal beamforming designs and capacity behavior

AU - Lee, Sang Rim

AU - Moon, Sung Hyun

AU - Lee, Inkyu

PY - 2012/12/1

Y1 - 2012/12/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84871955468&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84871955468&partnerID=8YFLogxK

U2 - 10.1109/ICC.2012.6364301

DO - 10.1109/ICC.2012.6364301

M3 - Conference contribution

AN - SCOPUS:84871955468

SN - 9781457720529

SP - 2151

EP - 2155

BT - IEEE International Conference on Communications

ER -