Smart-antenna operation for indoor wireless local-area networks using OFDM

Ari Alastalo, Mika Kahola

Research output: Contribution to journalArticleScientificpeer-review

35 Citations (Scopus)

Abstract

This paper reports link-level Monte Carlo simulations for a system that is compatible with the physical layer of the 5-GHz IEEE 802.11a wireless-local-area network and utilizes an adaptive antenna array at the access point for single-user smart-antenna operation, as well as for space-division multiple access (SDMA). For the spatial indoor radio propagation channel, complex impulse-response recordings are used. These are obtained in wideband channel-sounder measurements in three different buildings at 5.3 GHz. Thus, no unrealistic assumptions about channel conditions are involved. The paper studies how the packet-error-rate performance for the downlink (DL) is affected by time evolution of the radio channel that takes place after the uplink operation in which channel estimation is performed, and before DL operation in which the estimated channel information is utilized. Based on simulations two-user SDMA is possible with four-antenna elements under indoor propagation conditions and with six antennas three users can simultaneously be served. Delay spreads, coherence bandwidths, and correlation properties (in space, frequency, and polarization) of the radio channels obtained in the measurements are also discussed. The results suggest that indoor time-division-duplex systems with access-point-controlled scheduling are desirable communication systems which can benefit from SDMA.
Original languageEnglish
Pages (from-to)392-399
JournalIEEE Transactions on Wireless Communications
Volume2
Issue number2
DOIs
Publication statusPublished - 2003
MoE publication typeA1 Journal article-refereed

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Smart Antennas
Space division multiple access
Smart antennas
Wireless Local Area Network (WLAN)
Wireless local area networks (WLAN)
Orthogonal Frequency Division multiplexing (OFDM)
Orthogonal frequency division multiplexing
Division
Multiple Access
Acoustic variables measurement
Antennas
Antenna
Radio transmission
Propagation
Channel estimation
Impulse response
Antenna Arrays
Channel Estimation
Communication systems
Uplink

Cite this

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Smart-antenna operation for indoor wireless local-area networks using OFDM. / Alastalo, Ari; Kahola, Mika.

In: IEEE Transactions on Wireless Communications, Vol. 2, No. 2, 2003, p. 392-399.

Research output: Contribution to journalArticleScientificpeer-review

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