Reliability-based type II hybrid ARQ schemes

Tripathi, V.; Visotsky, Eugene; Peterson, Roger L.; Honig, Michael L.

doi:10.1109/icc.2003.1204563

Cited by 34 publications

(31 citation statements)

References 5 publications

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“…The current HARQ schemes defines error correction code puncturing patterns and retransmission policies that allow the combining of received information from multiple transmissions to improve the likelihood of successful decoding [1]. When information from multiple retransmission is combined, the system is said to be using a hybrid type-II ARQ or incremental redundancy (IR) [3].…”

Section: Introductionmentioning

confidence: 99%

Reliability-based hybrid ARQ with reduced feedback overhead

Liu¹,

She²,

Chen³

et al. 2009

2009 IEEE International Conference on Communications Technology and Applications

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Reliability-based hybrid ARQ (RB-HARQ) is a recently developed form of incremental-redundancy ARQ. In RB-HARQ, the bits that are to be retransmitted are adaptively selected at the receiver based on the estimated bit reliabilities. This technique has the potential to improve performance and minimize retransmission size by targeting those bits that are likely to be in error. However, previous versions of the RB-HARQ algorithm have resulted in large request (NACK) packets that made the technique appropriate only for systems that can tolerate large request packets on the feedback link. Therefore, in this paper, by exploiting the high correlation of reliabilities of information bits mapping to same modulation symbol, we propose a symbolbased unreliable bits feedback scheme for RB-HARQ, in which instead of the indices of information bits, the indices of symbols are selected and fed back. The performance of the proposed technique is evaluated in terms of feedback overhead, packet error rate and spectral efficiency. The results show that the proposed technique can reduce the feedback overhead significantly with no or negligible performance loss.

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Section: Introductionmentioning

confidence: 99%

Reliability-based hybrid ARQ with reduced feedback overhead

Liu¹,

She²,

Chen³

et al. 2009

2009 IEEE International Conference on Communications Technology and Applications

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“…The procedure is repeated until all parity bits are transmitted. In [6] the authors have proposed a scheme based on the reliability of the received packets. The received packet reliability was obtained by calculating the average value of the LLR of the bits within each packet.…”

Section: Introductionmentioning

confidence: 99%

Hybrid ARQ Scheme Based on Recursive Convolutional Codes and Turbo Decoding

Rodrigues

Souza

Pellenz

2007

2007 IEEE International Conference on Communications

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We propose a hybrid ARQ scheme using recursive convolutional codes and the turbo principle. In the first transmission the system encodes the data through a systematic recursive convolutional encoder. In the second transmission data is interleaved prior to being encoded by a recursive convolutional encoder. Then, from the second transmission on the receiver operates as a turbo decoder. The proposed method is compared with a popular scheme known in the literature. It is shown that, while spending the same energy for transmission, the proposed scheme presents both smaller FER and decoding complexity.

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“…In the aforementioned works the error probability equals the probability that an outage occurs and for the last two protocols this depends on the retransmission effort. Optimal choice for the sequence of success probabilities can be found in [5], where the sequence is empirically optimized as well as in [10] where the optimization is based on Dynamic Programming tools.…”

Section: Introductionmentioning

confidence: 99%

“…Rayleigh, X 2 etc.). In this setting we consider a fixed infinite sequence of per effort success probabilities, denoted by {qk}, whose values depend on the type of modulation [3], coding [4], [5], [6], power allocation and type of protocol used which may exploit or not previously erroneous efforts.…”

Section: Introductionmentioning

confidence: 99%

Conditions for the stability of wireless ARQ protocols and reliable communications

Giovanidis

Stańczak

2009

2009 European Wireless Conference

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We consider ARQ protocols which vary the error probabilities per retransmission, having no channel state information at the transmitter. Such protocols can be described by irreducible and aperiodic discrete time Markov chains with countably infinite states of a specific form. Ergodicity of such chains guarantees finite expected delay until correct reception as well as positive throughput. Initiating from general stability criteria we formulate and prove necessary and sufficient conditions for recurrence, ergodicity and non-ergodicity for the chains of interest. The conditions are applied to the case of retransmissions via a Rayleigh fading channel to obtain recurrence and ergodicity conditions based on power allocation per retransmission

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Reliability-based type II hybrid ARQ schemes

Cited by 34 publications

References 5 publications

Reliability-based hybrid ARQ with reduced feedback overhead

Reliability-based hybrid ARQ with reduced feedback overhead

Hybrid ARQ Scheme Based on Recursive Convolutional Codes and Turbo Decoding

Conditions for the stability of wireless ARQ protocols and reliable communications

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