Multi-User Opportunistic Scheduling using Power Controlled Hierarchical Constellations

TitleMulti-User Opportunistic Scheduling using Power Controlled Hierarchical Constellations
Publication TypeJournal Article
Year of Publication2007
AuthorsHossain, J., M. - S. Alouini, and V. K. Bhargava
JournalWireless Communications, IEEE Transactions on
Pagination1581 -1586
Date Publishedmay.
Keywordsaverage buffer occupancy, BER, bit error rate, buffer distribution, constellation parameter, error statistics, multi-user opportunistic scheduling, outage probability, packet loss probability, power control, power controlled hierarchical constellations, queueing theory, queuing analysis, scheduling, telecommunication control, truncated channel inversion power control, uniform constellation-based time-slotted scheme, wireless channels

In this letter, we study an application of hierarchical constellations (known also as embedded, multi-resolution, or asymmetrical constellations) for multi-user opportunistic scheduling. The key idea is to rely on hierarchical constellations to transmit information to two or more best users simultaneously in each transmission. The transmit power as well as the constellation parameter is changed according to the link qualities of the selected users in a way that a given target bit error rate (BER) is satisfied. The expressions for the average transmit power, and the outage probability with truncated channel inversion power control are presented. We also analyze and compare buffer distribution, average buffer occupancy, and packet loss probability of different; schemes via queuing analysis. We finally compare the hierarchical scheme for multi-user scheduling with a uniform constellation-based time-slotted scheme


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