Multi-beam assisted MIMO - A novel approach to fixed beamforming

Agisilaos Papadogiannis*, Alister G. Burr

*Corresponding author for this work

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


Fourth-generation (4G) wireless networks promise the provision of unprecedented data rates. However apart from achieving a very high headline rate, it is also critical that future systems provide the capacity density of at least 1 Gbit/s/km 2 that is expected to be in demand. A promising solution that can provide the needed capacity density uses a large number of narrow beams at the base station with the aid of a Butler matrix. This fixed beamforming approach needs to be enhanced in order to provide the required capacity density as user throughput suffers from inter-beam interference because users are not likely to be located at the boresight of beams. For this purpose we propose that multiple-input multiple-output (MIMO) techniques are applied in the beam domain, resulting in a concept we may describe as multi-beam assisted MIMO (MBA-MIMO). This is shown to effectively mitigate interference and enable the provision of the required capacity density. Therefore MBA-MIMO is an attractive technology that can play a prominent role in future wireless networks beyond 4G.

Original languageEnglish
Title of host publication2011 Future Network and Mobile Summit, FutureNetw 2011
Publication statusPublished - 2011
Event2011 Future Network and Mobile Summit, FutureNetw 2011 - Warsaw, Poland
Duration: 15 Jun 201117 Jun 2011

Publication series

Name2011 Future Network and Mobile Summit, FutureNetw 2011


Conference2011 Future Network and Mobile Summit, FutureNetw 2011


  • Butler matrix (BM)
  • capacity density
  • Fixed beamforming
  • multi-beam assisted multiple-input multiple output (MBA-MIMO)
  • truncated Shannon bound (TSB)

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