Hierarchical constellations for multi-class 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

1 Scopus citations


We study in this paper an application of hierarchical constellations (known also as nonuniform, asymmetric, and multi-resolution constellations) in conjunction with a retransmission strategy to multiclass 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.

Original languageEnglish (US)
Pages (from-to)934-938
Number of pages5
JournalIEEE Vehicular Technology Conference
Issue number2
StatePublished - 2004
Externally publishedYes
Event2004 IEEE 59th Vehicular Technology Conference, VTC2004-Spring: Towards a Global Wireless World - Milan, Italy
Duration: May 17 2004May 19 2004

ASJC Scopus subject areas

  • Applied Mathematics
  • Electrical and Electronic Engineering
  • Computer Science Applications


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