Optimal Power Allocation for Hybrid ARQ With Chase Combining in I.i.d. Rayleigh Fading Channels

The authors consider the optimization of Chase Combining (CC)-based Hybrid-Automatic Repeat reQuest (HARQ) schemes with a limit on the maximum number of retransmissions. They formulate two optimization problems: minimizing the Packet Drop Probability (PDP) under a total average transmits power constraint, and minimizing the average transmits power under a fixed PDP constraint. Towards solving these equivalent optimization problems, they provide a closed-form expression for the outage probability of a CC-HARQ scheme. They then show that solving the optimization problems using an exact expression of the outage probability becomes complex with an increase in the maximum number of retransmissions.

Provided by: Institute of Electrical & Electronic Engineers Topic: Mobility Date Added: Apr 2013 Format: PDF

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