Impact of multiple transmit antennas in a queued SDMA/TDMA downlink

Mari Kobayashi, Giuseppe Caire, David Gesbert

Research output: Contribution to conferencePaperpeer-review

14 Scopus citations

Abstract

We investigate the impact of multiple transmit antennas on the performance of a SDMA/TDMA single-cell downlink system under random packet arrivals, correlated block-fading channels and non-perfect channel state information at the transmitter due to a delay in the feedback link. We derive the arrival rate stability region and the adaptive scheduling policy that stabilizes any arrival rate point inside the region without knowing explicitly the arrival statistics. Then, we apply these results to the case of "opportunistic" beamforming and space-time coding. The ability of accurately predicting the channel SNR dominates the performance of opportunistic beamforming. Hence, we propose to exploit synchronous pseudo-random beamforming matrices known a priori by the receivers in order to improve the channel state information quality. Under this scheme, it appears that for given feedback delay the relative merit of opportunistic beamforming and space-time coding (transmit diversity) strongly depends on the channel Doppler bandwidth.

Original languageEnglish
Pages540-544
Number of pages5
DOIs
StatePublished - 2005
Externally publishedYes
Event2005 IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2005 - New York, NY, United States
Duration: 5 Jun 20058 Jun 2005

Conference

Conference2005 IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2005
Country/TerritoryUnited States
CityNew York, NY
Period5/06/058/06/05

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