NDLI: A two step spatio-temporal filtering scheme for smart antennas compared to a multi-user maximum likelihood algorithm

Content Provider	IEEE Xplore Digital Library
Author	Brunner, C. Haardt, M. Farsakh, C. Nossek, J.A.
Copyright Year	1998
Description	Author affiliation: Mobile Networks, Siemens AG, Munich, Germany (Brunner, C.)
Abstract	Future wireless communication systems require an increased spectral efficiency to accommodate the growing number of users and permit connections with higher data rates. To this end, smart antenna arrays utilizing adaptive beamforming techniques on the uplink as well as the downlink enable space division multiple access (SDMA). Furthermore, the range is increased significantly which is of great advantage in rural areas. We present an algorithm in which a two-dimensional (2-D) spatial filtering scheme based on 2-D unitary ESPRIT is used to separate the dominant wavefronts. Then the separated wavefronts are assigned to the users by correlating them with known training sequences. To obtain temporal equalization, all wavefronts assigned to a particular user are passed on to the different diversity branches of a (single-user) Viterbi equalizer. The performance of this two step spatio-temporal filter is compared to a computationally more expensive algorithm in which a joint multi user maximum likelihood equalizer is applied to the impulse responses of all co-channel users. The impulse responses are estimated by exploiting the training sequences. Monte Carlo simulations for synthetic and realistic scenarios allow a performance evaluation of both schemes based on the uplink bit error ratio. Note that (both) data detection schemes require spatially well separated users to obtain good performance. Therefore, an intelligent channel assignment strategy is examined in connection with both schemes.
Starting Page	885
Ending Page	889
File Size	741711
Page Count	5
File Format	PDF
ISBN	0780343204
ISSN	10903038
DOI	10.1109/VETEC.1998.683709
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-05-21
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Adaptive arrays Two dimensional displays Equalizers Wireless communication Antenna arrays Array signal processing Downlink Multiaccess communication Filtering algorithms Viterbi algorithm
Content Type	Text
Resource Type	Article

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