Hierarchical constellation for multi-resolution data transmission over block fading channels

TitleHierarchical constellation for multi-resolution data transmission over block fading channels
Publication TypeConference Paper
Year of Publication2004
AuthorsHossain, M. J., M. - S. Alouini, and V. K. Bhargava
Conference NameCommunications, 2004 IEEE International Conference on
Pagination3101 - 3105 Vol.5
Date Publishedjun.
Keywordsadaptive scheduling protocol, block fading channels, data communication, hierarchical constellation, Markov chain, Markov processes, mobile radio, multiresolution image data transmission, multiresolution video data transmission, protocols, quadrature amplitude modulation, Rayleigh channels
Abstract

We propose a new technique for multi-resolution video/image data transmission over block fading channels. The proposed scheme uses an adaptive scheduling protocol employing a retransmission strategy in conjunction with a hierarchical signal constellation (known also as nonuniform, asymmetric, multi-resolution constellation) to give different transmission priorities to different resolution levels. Transmission priorities are given in terms of packet loss rate as well as average throughput i.e., transmission rate. Basically, according to the transmission scheduling and channel state (acknowledgment signal) of the previous transmission, it dynamically selects packets from different resolution levels to transmit for the current transmission. The bits from the selected packets are assigned to different hierarchies of a hierarchical 4/16- quadrature amplitude modulation to transmit them with different error protections. The selection of packets for transmission and the assignment of these selected packets to different hierarchies of the hierarchical constellation are referred to as the scheduling protocol in our proposed scheme. We model this protocol by a finite state first order Markov chain and obtain the packet loss rate and the packet transmission rate over Nakagami-m block fading channel in closed-form. Some selected numerical results show that the proposed scheme can control the relative packet loss rate and the packet transmission rate of different resolution levels by varying the priority parameter (or equivalently the asymmetry) of the hierarchical constellation and the maximum number of allowed retransmissions.

URLhttp://dx.doi.org/10.1109/ICC.2004.1313102
DOI10.1109/ICC.2004.1313102

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