Title :
Time-Frequency Resource Allocation for Min-Rate Guaranteed Services in OFDM Distributed Antenna Systems
Author :
Xu, Wenjun ; Niu, Kai ; He, Zhiqiang ; Wu, Weiling
Author_Institution :
Beijing Univ. of Posts & Telecommun., Beijing
Abstract :
A novel resource allocation problem for min-rate guaranteed services is studied in orthogonal frequency division multiplexing (OFDM) distributed antenna systems (DAS) by this paper. In addition to multiuser diversity as well as conventional space diversity (such as multiple-input multiple-output (MIMO) -OFDM), distributed multiantenna diversity and time diversity are also exploited by the proposed algorithm. The proposed allocation algorithm iteratively assigns subcarriers to users to maximize rate-sum capacity subject to min-rate constraints. Simulated results show the proposed algorithm can fully utilize all degrees of freedom including antenna, user, time, and frequency to ensure users´ min-rate transmission. Consequently, OFDM DAS outperforms OFDM co-located antenna systems (CAS) in terms of rate-sum capacity due to distributed antenna deployment.
Keywords :
MIMO communication; OFDM modulation; antennas; diversity reception; resource allocation; MIMO-OFDM; OFDM distributed antenna systems; co-located antenna systems; distributed multiantenna diversity; min-rate guaranteed services; min-rate transmission; multiple-input multiple-output; multiuser diversity; orthogonal frequency division multiplexing; rate-sum capacity; space diversity; time diversity; time-frequency resource allocation; Adaptive arrays; Antennas and propagation; Content addressable storage; Fading; Iterative algorithms; MIMO; OFDM; Propagation losses; Resource management; Time frequency analysis;
Conference_Titel :
Global Telecommunications Conference, 2007. GLOBECOM '07. IEEE
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4244-1042-2
Electronic_ISBN :
978-1-4244-1043-9
DOI :
10.1109/GLOCOM.2007.705
