Transmission schemes based on sum rate analysis in distributed antenna systems

Heejin Kim, Sang Rim Lee, Kyoung Jae Lee, Inkyu Lee

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

In this paper, we study single cell multi-user downlink distributed antenna systems (DAS) where antenna ports are geographically separated in a cell. First, we derive an expression of the ergodic sum rate for the DAS in the presence of pathloss. Then, we propose a transmission selection scheme based on the derived expressions which does not require channel state information at the transmitter. Utilizing the knowledge of distance information from a user to each distributed antenna (DA) port, we consider the optimization of pairings of DA ports and users to maximize the system performance. Based on the ergodic sum rate expressions, the proposed scheme chooses the best mode maximizing the ergodic sum rate among mode candidates. In our proposed scheme, the number of mode candidates are greatly reduced compared to that of ideal mode selection. In addition, we analyze the signal to noise ratio cross-over point for different modes using the sum rate expressions. Through Monte Carlo simulations, we show the accuracy of our derivations for the ergodic sum rate. Moreover, simulation results with the pathloss modeling confirm that the proposed scheme produces the average sum rate identical to the ideal mode selection with significantly reduced candidates.

Original languageEnglish
Article number6138838
Pages (from-to)1201-1209
Number of pages9
JournalIEEE Transactions on Wireless Communications
Volume11
Issue number3
DOIs
Publication statusPublished - 2012 Mar

Keywords

  • Sum rate
  • distributed antenna systems (DAS)
  • multi-user

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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