An Improved Hybrid ARQ Scheme in Cooperative Wireless Networks

Pang, Kun; Li, Yonghui; Vucetic, Branka

doi:10.1109/vetecf.2008.169

Cited by 9 publications

(3 citation statements)

References 13 publications

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“…This provides noise reduction and early detection of failures, but the required processing increases latency, complexity, and power consumption. Previous literature has shown that DF generally has higher channel capacity than AF [29] and lower frame error rate (FER) with several HARQ protocols [30]. However, some of the practical benefits of AF, such as simpler hardware and lower latency, were not considered in those studies.…”

Section: Introductionmentioning

confidence: 99%

Optimizing HARQ and Relay Strategies in Limited Feedback Communication Systems

2020

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One of the key challenges for future communication systems is to deal with fast changing channels due to the mobility of users. Having a robust protocol capable of handling transmission failures in unfavorable channel conditions is crucial, but the feedback capacity may be greatly limited due to strict latency requirements. This paper studies the hybrid automatic repeat request (HARQ) techniques involved in re-transmissions when decoding failures occur at the receiver and proposes a scheme that relies on codeword bundling and adaptive incremental redundancy (IR) to maximize the overall throughput in a limited feedback system. In addition to the traditional codeword extension IR bits, this paper introduces a new type of IR, bundle parity bits, obtained from an erasure code across all the codewords in a bundle. The type and number of IR bits to be sent as a response to a decoding failure is optimized through a Markov Decision Process. In addition to the single link analysis, the paper studies how the same techniques generalize to relay and multi-user broadcast systems. Simulation results show that the proposed schemes can provide a significant increase in throughput over traditional HARQ techniques.

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Section: Introductionmentioning

confidence: 99%

Optimizing HARQ and Relay Strategies in Limited Feedback Communication Systems

2020

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“…A cooperative rate adaptive wireless network with HARQ is investigated on independent fading channels by adopting capacity theorem approach in [5], [6]. Authors propose an improved relaying protocol by combining various relaying strategies in [7] for a cooperative network which consists of a single relay without employing AMC scheme.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Cooperative Hybrid ARQ with Adaptive Modulation and Coding on a Correlated Fading Channel

Ozkan

2019

Preprint

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In this study, a cross-layer design which combines adaptive modulation and coding (AMC) and hybrid automatic repeat request (HARQ) techniques for a cooperative wireless network is investigated analytically. Previous analyses of such systems in the literature are confined to the case where the fading channel is independent at each retransmission, which can be unrealistic unless the channel is varying very fast. On the other hand, temporal channel correlation can have a significant impact on the performance of HARQ systems. In this study, utilizing a Markov channel model which accounts for the temporal correlation, the performance of non-cooperative and cooperative networks are investigated in terms of packet loss rate and throughput metrics for Chase combining HARQ strategy.

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“…This combined strategy is called H 2 -ARQ-Relaying since both the retransmission protocols and the relaying schemes are hybrid. Some preliminary work on H 2 -ARQ-Relaying is done in [22], where the relay system can switch between AF and DF and exhibits significant frame error rate improvement.…”

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confidence: 99%

H2-ARQ-Relaying: Spectrum and Energy Efficiency Perspectives

Hoshyar²,

Imran

et al. 2011

IEEE J. Select. Areas Commun.

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Abstract-In this paper, we propose novel Hybrid Automatic Repeat re-Quest (HARQ) strategies used in conjunction with hybrid relaying schemes, named as H 2 -ARQ-Relaying. The strategies allow the relay to dynamically switch between amplify-andforward/compress-and-forward and decode-and-forward schemes according to its decoding status. The performance analysis is conducted from both the spectrum and energy efficiency perspectives. The spectrum efficiency of the proposed strategies, in terms of the maximum throughput, is significantly improved compared with their non-hybrid counterparts under the same constraints. The consumed energy per bit is optimized by manipulating the node activation time, the transmission energy and the power allocation between the source and the relay. The circuitry energy consumption of all involved nodes is taken into consideration. Numerical results shed light on how and when the energy efficiency can be improved in cooperative HARQ. For instance, cooperative HARQ is shown to be energy efficient in long distance transmission only. Furthermore, we consider the fact that the compress-and-forward scheme requires instantaneous signal to noise ratios of all three constituent links. However, this requirement can be impractical in some cases. In this regard, we introduce an improved strategy where only partial and affordable channel state information feedback is needed.

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An Improved Hybrid ARQ Scheme in Cooperative Wireless Networks

Cited by 9 publications

References 13 publications

Optimizing HARQ and Relay Strategies in Limited Feedback Communication Systems

Optimizing HARQ and Relay Strategies in Limited Feedback Communication Systems

Analysis of Cooperative Hybrid ARQ with Adaptive Modulation and Coding on a Correlated Fading Channel

H2-ARQ-Relaying: Spectrum and Energy Efficiency Perspectives

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