Optimum scheduling for orthogonal multiple access over fading channels using quantized channel state information

• Published in: 2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications pp. 366 - 370
• Main Authors: Marques, A.G., Giannakis, G.B., Ramos, F.J.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.07.2008
• Subjects: Bit error rate; Fading; Optimal scheduling; Quality of service; Resource management; Schedules; Wireless communication
• ISBN: 1424420458; 9781424420452
• ISSN: 1948-3244
• DOI: 10.1109/SPAWC.2008.4641631

The efficiency of multi-access communications over wireless fading links benefits from channel-adaptive allocation of the available bandwidth and power resources. Different from most existing approaches that allocate resources based on perfect channel state information (P-CSI), this work optimizes channel scheduling and resource allocation over orthogonal fading channels when user terminals and the scheduler rely on quantized channel state information (Q-CSI). The novel unifying approach optimizes an average transmit-performance criterion subject to average quality of service requirements. The resultant optimal policy per fading realization either allocates the entire channel to a single (winner) user, or, to a small group of winner users whose percentage of shared resources is found by solving a linear program. Both alternatives become possible by smoothing the allocation scheme. The smooth policy is asymptotically optimal and incurs reduced computational complexity.