Joint-Design of Multiresolution Modulation and ARQ Protocol for Prioritized Packet Transmission in Wireless Ad-Hoc Networks

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Executive Summary

In this paper, the authors investigate two variants of traditional Automatic Repeat reQuest (ARQ) protocols that exploit the disparity in bit error protection levels of multi-resolution M-ary phase-shift-keying for prioritizing the transport of more "Critical" messages in integrated voice/data and delay-sensitive applications (e.g., audio/video streaming). This cross-layer design can lead to a substantial performance improvement (e.g., better sound/picture quality or enhanced throughput of high priority messages) over non-prioritized transmission especially at low and moderate mean channel Signal-to-Noise Ratio (SNR) values or during network congestion.

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