Sparse array spatial diversity with dual-size spatial invariances to mitigate fading-channel effects

Kainam Thomas Wong, Michael D. Zoltowski

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

2 Citations (Scopus)

Abstract

A novel sparse array geometry embedding two sizes of spatial invariances is proposed for extended-aperture spatial diversity using a new ESPRIT-based algorithm. This novel direction-finding method extends array aperture without additional antennas, irregular inter-element spacings, nor any cyclic ambiguity in the final arrival angle estimates. The half-wavelength invariance yields unambiguous but high-variance DOA estimates to disambiguate low-variance but cyclically ambiguous estimates obtained using the larger invariance. This novel approach facilitates (1) multipath de-correlation (independent fading), (2) coherent summation of multipaths from the same source, and (3) down-link beamforming from the base-station to the mobile. Under one simulation scenario involving two closely spaced time-delayed multi-paths in frequency-selective slow-fading, the proposed algorithm offers an impressive 80% reduction in standard deviation and bias. Any additional computation needed by this method may he performed in parallel, thereby requiring no serious increase in overall computational time.
Original languageEnglish
Title of host publicationIEEE International Conference on Communications
PublisherIEEE
Pages142-146
Number of pages5
Publication statusPublished - 1 Jan 1997
Externally publishedYes
EventProceedings of the 1997 IEEE International Conference on Communications, ICC. Part 3 (of 3) - Montreal, Canada
Duration: 8 Jun 199712 Jun 1997

Conference

ConferenceProceedings of the 1997 IEEE International Conference on Communications, ICC. Part 3 (of 3)
CountryCanada
CityMontreal
Period8/06/9712/06/97

ASJC Scopus subject areas

  • Engineering(all)

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