DocumentCode :
428228
Title :
Multiuser switched diversity transmission
Author :
Holter, Bengt ; Alouini, Mohamed-Slim ; Øien, Geir E. ; Hong-Chuan Yang
Author_Institution :
Dept. of Electron. & Telecommun., Norwegian Univ. of Sci. & Technol., Trondheim, Norway
Volume :
3
fYear :
2004
fDate :
26-29 Sept. 2004
Firstpage :
2038
Abstract :
In this paper, a set of multiuser access schemes are proposed based on switched diversity algorithms originally devised to select between antennas in a spatial diversity system. Instead of relying on feedback from all the users in a multiuser communication system to identify the best user on a time-slot basis (having the best channel quality among all the users), the proposed multiuser access schemes are performed in a sequential manner, looking not for the best user but for an acceptable user. A user qualifies as an acceptable user and is selected by the base station when the reported channel quality is above a predefined switching threshold. The proposed schemes result in a lower average spectral efficiency (ASE) than using the optimal selective diversity scheme, but a gain is obtained by reducing the feedback load. Numerical results that quantify the trade-off between ASE and average feedback load (AFL) are presented, showing that the AFL can be reduced significantly compared to the optimal selective diversity scheme without experiencing a big performance loss. In addition, it is argued that the proposed multiuser access schemes can he quite attractive also from a fairness perspective.
Keywords :
diversity reception; mobile radio; multiuser detection; transceivers; acceptable user; average feedback load; average spectral efficiency; base station; fairness; multiuser switched diversity transmission; reported channel quality; sequential multiuser access; Base stations; Communication switching; Diversity methods; Diversity reception; Feedback; Performance loss; Receiving antennas; Telecommunication computing; Telecommunication switching; Time division multiplexing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th
ISSN :
1090-3038
Print_ISBN :
0-7803-8521-7
Type :
conf
DOI :
10.1109/VETECF.2004.1400397
Filename :
1400397
Link To Document :
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