Title :
Adaptive Rate and Power Allocation Schemes for OFDM/SDMA Systems
Author :
Maham, Behrouz ; Jedari, Esrafil ; Enayati, Alireza
Author_Institution :
Iran Telecommun. Res. Center, Tehran
Abstract :
In this paper, adaptive resource allocation approaches, which jointly adapts power distribution and snbcarrier allocation according to instantaneous channel conditions, is proposed for uplink OFDM/SDM-based multiuser system. The first scheme utilizes adaptive algorithm to reduce symbol- error rate. The closed-form algorithm is derived for this idea. The second contribution in this paper deals with constant-rate transmissions over a spatial multiuser OFDM system. In the proposed system, the receiver jointly optimizes rate and power assignments for each user and then informs them to the transmitter via a low-rate feedback channels.
Keywords :
OFDM modulation; multiuser channels; space division multiple access; OFDM-SDMA Systems; adaptive rate schemes; adaptive resource allocation; closed-form algorithm; constant-rate transmissions; instantaneous channel; low-rate feedback channels; multiuser system; power allocation schemes; snbcarrier allocation; symbol-error rate; Multiaccess communication; OFDM; Ultra wideband communication;
Conference_Titel :
Wireless Broadband and Ultra Wideband Communications, 2007. AusWireless 2007. The 2nd International Conference on
Conference_Location :
Sydney, NSW
Print_ISBN :
978-0-7695-2846-5
Electronic_ISBN :
978-0-7695-2846-5
DOI :
10.1109/AUSWIRELESS.2007.22
