Beamforming with partial channel knowledge

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Abstract

Multiple antenna techniques are used to enhance wireless links and therefore have been studied extensively. Many practical systems differ from ideal schemes which have been discussed in the literature. One example is a system that lacks precise channel information at the transmitter. We evaluate analytically the performance of a multiple input multiple output (MIMO) technique that uses partial channel knowledge. Specifically, we analyze a suboptimal M × N scheme employing Eigenbeamforming at the transmitter and MRC at the receiver, assuming only partial channel matrix is known to the transmitter, specifically only P out of N rows of the channel matrix are known. We show that the diversity order of such a scheme is MP + N - P and further show that increasing the value of P by one increases the diversity order by M - 1. We also derive the array gain for this scheme. All the results are supported by simulations.

Original languageEnglish
Title of host publication2011 4th IFIP International Conference on New Technologies, Mobility and Security, NTMS 2011 - Proceedings
DOIs
StatePublished - 2011
Event4th IFIP International Conference on New Technologies, Mobility and Security, NTMS 2011 - Paris, France
Duration: 7 Feb 201110 Feb 2011

Publication series

Name2011 4th IFIP International Conference on New Technologies, Mobility and Security, NTMS 2011 - Proceedings

Conference

Conference4th IFIP International Conference on New Technologies, Mobility and Security, NTMS 2011
Country/TerritoryFrance
CityParis
Period7/02/1110/02/11

Keywords

  • Beamforming
  • LTE
  • MIMO systems
  • Partial channel knowledge
  • WiMAX

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