Hierarchical constellations for multi-class data transmission over block fading channels [mobile communications]

TitleHierarchical constellations for multi-class data transmission over block fading channels [mobile communications]
Publication TypeConference Paper
Year of Publication2004
AuthorsHossain, M. J., M. - S. Alouini, and V. K. Bhargava
Conference NameVehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th
Pagination934 - 938 Vol.2
Date Publishedmay.
KeywordsARQ schemes, asymmetric constellations, automatic repeat request, average packet loss rate, average throughput, data transmission priority, delay requirements, fading channels, hierarchical constellations, hierarchical QAM, hierarchical systems, mobile radio, mobile wireless links, multiclass data transmission, multiresolution constellations, Nakagami-m block fading channels, nonuniform constellations, packet transmission rate, quadrature amplitude modulation, truncated retransmission scheme
Abstract

We study An application of hierarchical constellations (known also as nonuniform, asymmetric, and multi-resolution constellations) in conjunction with a retransmission strategy to multi-class data transmission over block fading channels. The basic idea is to assign different hierarchies of a hierarchical quadrature amplitude modulation (QAM) to different classes of data according to their transmission priorities (quantified through their average throughput and delay requirements) and then to apply a truncated retransmission scheme to each hierarchy (or equivalently each class of data) separately in order to meet the delay requirements of the various services. We present closed-form expressions for the average packet loss rate and the packet transmission rate of each class of data over Nakagami-m block fading channel. Some numerical results show that the proposed hierarchical scheme outperforms a classical time-multiplexing scheme employing power-controlled uniform QAM constellations for multi-class data transmission over block fading channels.

URLhttp://dx.doi.org/10.1109/VETECS.2004.1388967
DOI10.1109/VETECS.2004.1388967

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