MIMO/OFDM with adaptive interleaved beamforming and power allocation for high-capacity wireless access

Ya Han Pan, Khaled Letaief, Zhigang Cao

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Spatial diversity at both the transmitter and receiver has been widely regarded as a key technique with which OFDM can be combined to further improve the system performance of wireless networks. Selection diversity is the simplest way to realize spatial diversity, but the performance improvement of this form of diversity is limited. Adaptive antenna arrays can provide significant increases in system's capacity and performance, but they are characterized by a relatively higher implementation complexity than selection diversity. In this paper, we combine the benefits of these two spatial diversity methods and propose an adaptive interleaved beamforming approach for broadband MIMO/OFDM systems. By applying Eigenvalue Decomposition on the set of all available channel correlation matrices, the best beamforming which corresponds to the largest eigenvalue in the set is adaptively selected for each sub-carrier. By doing so, beamforming is adaptively interleaved in the spatial domain. Simulation results will show that the proposed system can result in significant performance improvements over the conventional adaptive antenna array based OFDM systems in wireless channels. Numerical results will also show that the performance of this proposed system can be further greatly improved by employing interleaved-beamforming-dependent power allocation among the sub-carriers.

Original languageEnglish
Pages (from-to)1906-1910
Number of pages5
JournalIEEE Vehicular Technology Conference
Volume59
Issue number4
Publication statusPublished - 2004
Externally publishedYes

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Keywords

  • Interleaved beamforming
  • Joint transmit and receive beamforming
  • MIMO/OFDM
  • Power allocation
  • Selection diversity

ASJC Scopus subject areas

  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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