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

Md Jahangir Hossain*, Mohamed Slim Alouini, Vijay K. Bhargava

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


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 nonnniform, 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.

Original languageEnglish (US)
Pages (from-to)3101-3105
Number of pages5
JournalIEEE International Conference on Communications
StatePublished - Jan 1 2004
Event2004 IEEE International Conference on Communications - Paris, France
Duration: Jun 20 2004Jun 24 2004

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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