Title :
Proportional Fair Power Allocation for OFDM-CDM Systems in Frequency-Selective Rayleigh Fading Channels
Author :
Brah, Felix ; Louveaux, Jerome ; Vandendorpe, Luc
Author_Institution :
Commun. & Remote Sensing Lab., Univ. Catholique de Louvain, Louvain-la-Neuve
Abstract :
Orthogonal frequency division multiplexing with code division multiplexing (OFDM-CDM) is one of the combined schemes of OFDM and CDMA techniques. The CDM component enables additional diversity in frequency selective fading channels. This paper proposes an optimal power allocation via proposal-fair strategy for the OFDM-CDM-based systems. A zero-forcing beamformer is used at the mobile unit and the basestation optimizes its power allocation to maximize the sum-rate subject to fairness constraints. Two optimization techniques are proposed. Simulation results are provided for typical downlink situation and a fairness index is compared to that of system optimized without fairness request
Keywords :
OFDM modulation; Rayleigh channels; code division multiple access; code division multiplexing; diversity reception; optimisation; CDMA techniques; OFDM-CDM systems; code division multiplexing; fairness constraints; fairness index; fairness request; frequency-selective Rayleigh fading channels; optimization techniques; orthogonal frequency division multiplexing; proportional fair power allocation; proposal-fair strategy; sum-rate subject; zero-forcing beamformer; AWGN; Code division multiplexing; Constraint optimization; Diversity reception; Downlink; Fading; Frequency diversity; OFDM; Radio spectrum management; Resource management;
Conference_Titel :
Signal Processing Advances in Wireless Communications, 2006. SPAWC '06. IEEE 7th Workshop on
Conference_Location :
Cannes
Print_ISBN :
0-7803-9710-X
Electronic_ISBN :
0-7803-9711-8
DOI :
10.1109/SPAWC.2006.346467
