On Noisy ARQ in Block-Fading Channels
Artikel i vetenskaplig tidskrift, 2014
Assuming noisy feedback channels, this paper investigates the data transmission efficiency and robustness of different
automatic repeat request (ARQ) schemes using adaptive power allocation. Considering different block-fading channel
assumptions, the long-term throughput, the delay-limited throughput, the outage probability and the feedback load of
different ARQ protocols are studied. A closed-form expression for the power-limited throughput optimization problem is obtained which is valid for different ARQ protocols and feedback channel conditions. Furthermore, the paper presents numerical investigations on the robustness of different ARQ protocols to feedback errors. It is shown that many analytical assertions about the ARQ protocols are valid both when the channel remains fixed during all retransmission rounds and when it changes in each round (in)dependently. As demonstrated, optimal power allocation is crucial for the performance of noisy ARQ schemes when the goal is to minimize the outage probability.
Noisy feedback channel
Automatic repeat request