Title :
Joint adaptive power control and detection in OFDM/SDMA wireless LANs
Author :
Li, Junqiang ; Letaief, K.B. ; Cheng, Roger S. ; Cao, Zhigang
Author_Institution :
Centerfor Wireless Inf. Technol., Hong Kong Univ. of Sci. & Technol., Kowloon, China
Abstract :
A joint adaptive power control and detection algorithm for both the uplink and downlink in OFDM/SDMA wireless LANs is proposed to improve the power and spectral efficiencies. Assuming that all users undergo the same shadow fading, the proposed scheme adaptively updates the powers and the LMMSE spatial filter coefficients of the users for both the forward and reverse links and provides users with an acceptable quality of service (QoS) while minimizing the total transmit power. Simulation results are given to show the effectiveness of the proposed scheme compared with the conventional ODFM/SDMA scheme
Keywords :
OFDM modulation; adaptive control; adaptive signal detection; fading channels; indoor radio; least mean squares methods; optimisation; power control; quality of service; space division multiple access; spatial filters; telecommunication control; wireless LAN; LMMSE spatial filter coefficients; OFDM/SDMA wireless LAN; QoS; adaptive detection; adaptive power control; indoor wireless communication systems; power efficiency; quality of service; shadow fading; spectral efficiency; Adaptive control; Detection algorithms; Downlink; Fading; Multiaccess communication; OFDM; Power control; Programmable control; Quality of service; Wireless LAN;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd
Conference_Location :
Rhodes
Print_ISBN :
0-7803-6728-6
DOI :
10.1109/VETECS.2001.944943
