NDLI: Wideband CDMA signal propagation with application to smart antennas

Content Provider	IEEE Xplore Digital Library
Author	Tin, N.T. Blostein, S.D.
Copyright Year	2002
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Queen's Univ., Canada (Tin, N.T.; Blostein, S.D.)
Abstract	There is interest in increasing the data rates of terrestrial wireless systems by increasing the chip rates in code division multiple access (CDMA) systems, as well as by employing base stations equipped with smart antennas. We have constructed an experimental facility to assess certain key propagation effects in wideband CDMA (at 7 Mcps) employing digital multi-beamforming at a base station receiver antenna array. One of the unique features of our system is that we employ multiple transmitters to assess experimentally the impact of multiuser interference. After characterizing the resolvable multipath, including the temporal dynamics, we study the spatial signatures received from four simultaneous users. We show that by processing the received data in blocks of 25 bits, it is possible to achieve a significant array gain (over 3 dB; on average from 4 antennas) if the multiuser interference is taken into account via maximum signal-to-noise-plus-interference (SINR) beamforming. If the spatial signatures of users are too similar, however, these gains are not realized. Moreover, spatial signatures were not found to be predictable from users' physical locations.
Starting Page	591
Ending Page	595
File Size	362821
Page Count	5
File Format	PDF
ISBN	0780374673
ISSN	10903038
DOI	10.1109/VETECF.2002.1040413
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-09-24
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Broadband antennas Multiaccess communication Antennas and propagation Base stations Receiving antennas Antenna arrays Interference Transmitters Spatial resolution Gain
Content Type	Text
Resource Type	Article

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