On Noisy ARQ in Block-Fading Channels

• Assuming noisy feedback channels, this paper investigates the data transmission efficiency and robustness of differentautomatic repeat request (ARQ) schemes using adaptive power allocation. Considering different block-fading channelassumptions, the long-term throughput, the delay-limited throughput, the outage probability and the feedback load ofdifferent 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.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Telekommunikation (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Telecommunications (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)

Nyckelord

Noisy feedback channel

feedback load

outage probability

power allocation

Automatic repeat request

throughput

ARQ

block-fading channel

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art (ämneskategori)

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