Networking

An Information-Theoretic Approach to Accelerated Simulation of Hybrid-ARQ Systems

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Executive Summary

In order to reduce the long runtimes required to simulate hybrid Automatic Repeat-reQuest (ARQ) systems, such as High-Speed Downlink Packet Access (HSDPA), the authors propose an information-theoretic approach to accelerate the simulation while still maintaining its fidelity. The approach is based on the concept of information-outage probability, and involves the computation of the mutual information between the code bits transmitted over the channel and the bit log-likelihood ratio coming out of the demodulator. Because the mutual information is measured at the demodulator output, the metric naturally accounts for the parameters of the channel and modulation as well as the length of the codeword.

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