Harnessing receive diversity in distributed multi-user MIMO networks

Ching-Ju Lin, Bo Si Chen, Hung Yu Wei

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


In existing multiuser MIMO (MU-MIMO) MAC protocols, a multi-antenna node sends as many concurrent streams as possible once it wins the contention. Though such a scheme allows nodes to utilize the multiplex gain of a MIMO system, it however fails to leverage receive diversity gains provided by multiple receive antennas across nodes. We introduce Multiplex-Diversity Medium Access (MDMA), a MU-MIMO MAC protocol that achieves both the multiplex gain and the receive diversity gain at the same time. Instead of letting a node pair use all the available degrees of freedom, MDMA allows as many contending node pairs to communicate concurrently as possible and share all the degrees of freedom. It hence can exploit the antennas equipped on different receivers to further provide some of concurrent streams more receive diversity, without losing the achievable multiplex gain. We implement a prototype on software radios to demonstrate the throughput gain of MDMA.
Original languageEnglish
Pages (from-to)505-506
Number of pages2
JournalComputer Communication Review
Issue number4
StatePublished - Aug 2013


  • diversity gain
  • medium access control
  • multi-user mimo

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