Wireless MIMO switching: Sum rate optimization

Fanggang Wang, Xiaojun Yuan, Soung Chang Liew, Dongning Guo

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


This paper addresses relay design for a wireless multiple-input-multiple- output (MIMO) switching scheme that enables data exchange among multiple users. Here, a multi-antenna relay linearly precodes the received (uplink) signals from multiple users before forwarding the signal in the downlink, where the purpose of precoding is to let each user receive its desired signal with interference from other users suppressed. The problem of optimizing the precoder based on sum-rate maximization criteria is typically non-convex and difficult to solve. The main contribution of this paper is that we show the sum-rate maximization problem can be converted to an equivalent weighted sum-MSE minimization problem and can therefore be solved using an iterative algorithm proposed in our previous work. Asymptotic analysis reveals that, with properly chosen initial values, the proposed iterative algorithms are asymptotically optimal in both high and low signal-to-noise-ratio (SNR) regimes for MIMO switching, either with or without self-interference cancellation (a.k.a., physical-layer network coding). Numerical results show that the optimized MIMO switching scheme based on the proposed algorithms significantly outperforms existing approaches in the literature.

Original languageEnglish (US)
Title of host publication2013 IEEE Wireless Communications and Networking Conference, WCNC 2013
Number of pages6
StatePublished - Aug 21 2013
Event2013 IEEE Wireless Communications and Networking Conference, WCNC 2013 - Shanghai, China
Duration: Apr 7 2013Apr 10 2013


Other2013 IEEE Wireless Communications and Networking Conference, WCNC 2013


  • Beamforming
  • MIMO switching
  • linear precoding
  • minimum mean square error (MMSE)
  • physical-layer network coding
  • relay

ASJC Scopus subject areas

  • Engineering(all)


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