吉林大学学报(工学版) ›› 2011, Vol. 41 ›› Issue (02): 514-0519.

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Distributed scheduling algorithm for multiuser MIMO downlink with adaptive feedback

LI Zhao,YANG Jia-wei,YAO Jun-liang,CHEN Ting   

  1. State Key Laboratory of Integrated Service Networks, Xidian University,Xi'an 710071,China
  • Received:2009-03-31 Published:2011-03-01

Abstract:

We propose a distributed scheduling algorithm for multiuser MIMO downlink with dynamic variation of transmission mode and feedback cost. With this algorithm each Mobile Station (MS) chooses transmission scheme, including beamforming and spatial multiplexing according to its channel state, then, feeds back the Channel State Information (CSI) to the Base Station (BS). Based on the received SCI, BS selects user subset to communicate with and implements precoding method to eliminate CoChannel Interference (CCI). The user scheduling is carried out by MS and BS corporately. The cost of the system feedback depends on each MS's channel state. Compared with existing methods, the proposed algorithm can achieve higher system capacity and better Bit Error Rate (BER) performance with appropriate feedback load.

Key words: communication, multiuser, MIMO system, downlink, scheduling, precoding, feedback

CLC Number: 

  • TN929.5
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