Journal of Communications and Networks

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Adaptive Mode Switching in Correlated Multiple Antenna Cellular Networks

  • Lee, Chul-Han (the Oracle Corp.) ;
  • Chae, Chan-Byoung (School of Engineering and Applied Sciences, Harvard University) ;
  • Vishwanath, Sriram (Wireless Networking and Communications Group (WNCG), Department of Electrical and Computer Engineering, University of Texas at Austin) ;
  • Heath, Jr., Robert W. (Wireless Networking and Communications Group (WNCG), Department of Electrical and Computer Engineering, University of Texas at Austin)
  • Published : 2009.06.30
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Abstract

This paper proposes an adaptive mode switching algorithm between two strategies in multiple antenna cellular networks:A single-user mode and a multi-user mode for the broadcast channel. If full channel state information is available at the base station, it is known that a multi user transmission strategy would outperform all single-user transmission strategies. In the absence of full side information, it is unclear what the capacity achieving method is, and thus there are few criteria to decide which of the myriad possible methods performs best given a system configuration. We compare a single user transmission and a multi user transmission with linear receivers in this paper where the transmitter and the receivers have multiple antennas, and find that neither strategy dom inates the other. There is instead a transition point between the two strategies. Then, the mode switching point is determined both ana lytically and numerically for a multiple antenna cellular downlink with correlation between transmit antennas.

Keywords

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