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Exploiting multiple antennas for synchronization

Research output: Contribution to journalArticle

Original languageEnglish
Pages773 - 787
Number of pages15
JournalIEEE Transactions on Vehicular Technology
Journal publication dateFeb 2009
Volume58
Journal issue2
DOIs
StatePublished

Abstract

Orthogonal frequency-division multiplex (OFDM) offers a low-complexity solution to equalization in multipath channels but does so by increasing the symbol period. This places a limit on the mobility of such systems since time variations in the channel during the symbol period introduce intercarrier interference (ICI), hence, degrading performance. Solutions to reduce ICI in the literature require a high degree of processing. Increasing terminal mobility also places greater requirements on synchronization processing to track the rapidly changing channel. This paper uses multiple antennas at the receiver so that the channel response can be decomposed into a number of more slowly varying channels. Independent synchronization processing and correction can be applied to each of the derived channels before combining the signals prior to the fast Fourier transform (FFT) process. By individually processing the channels, the effective channel is compressed in the time and frequency domains, improving system performance. Perfect tracking of the multipath clusters is initially assumed to show the potential benefits, followed by operation with an idealized tracking algorithm. Operation with more realistic processing algorithms using fixed sectored elements improving the bit error rate (BER) is investigated. Finally, the benefits are then demonstrated with real measured channels from an urban environment

Additional information

Sponsorship: The work reported in this paper formed part of the Wireless Enablers area of the Core 3 Research Programme of the Virtual Centre of Excellence in Mobile and Personal Communications (Mobile VCE; www.mobilevce.com). The channel measurement data sets were provided by S.E. Foo, who was funded by an Overseas Research Scholarship and the Centre for Communications Research, University of Bristol Terms of use: Copyright © 2009 IEEE. Reprinted from IEEE Transactions on Vehicular Technology. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

Research areas

  • antena arrays, digital communications, digital video broadcasting (DVB), orthogonal frequency-division multiplex (OFDM), synchronization

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