Rate Selection Algorithms for IR Hybrid ARQ

Gopalakrishnan, N.; Gelfand, S.B.

doi:10.1109/sarnof.2008.4520072

Cited by 11 publications

(5 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We show, in Fig. 2, the throughput of HARQ-AIR for K = 2, 3, 4 with the lower bound η 0 given by (5) (i.e., when K = 1) and the upper bound C by (4). Observe that for high SNR the throughput of HARQ-AIR gets very close to the ergodic capacity when K = 4 (this is notable as we recall that the transmitter has no knowledge of the instantaneous CSI).…”

Section: Optimization and Numerical Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Adaptive Incremental Redundancy for HARQ Transmission with Outdated CSI

Szczeciński¹,

Duhamel

Rahman

2011

2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

View full text Add to dashboard Cite

We analyze the throughout achievable in transmission over block-fading channels when the instantaneous channel state information (CSI) is not available at the transmitter. Assuming operation with incremental redundancy hybrid ARQ (HARQ), we propose to adapt the transmissions rates using the outdated CSI, i.e., the one experienced by the receiver in the past transmissions that resulted in a packet decoding failure. We show that, even if the CSI is fully outdated, i.e., in independently block-fading channel, the adaptation provides notable gains over a non-adaptive HARQ and for high SNR, a few transmissions are necessary to approach closely the ergodic capacity.

show abstract

Section: Optimization and Numerical Resultsmentioning

confidence: 99%

“…This makes our work different from the analysis of HARQ shown, e.g., in [4] [5] or [6] which was not adaptive, i.e, the transmission parameters (rates) were set independently of the CSI returned by the receiver.…”

Section: Introductionmentioning

confidence: 97%

Adaptive Incremental Redundancy for HARQ Transmission with Outdated CSI

Szczeciński¹,

Duhamel

Rahman

2011

2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

View full text Add to dashboard Cite

show abstract

“…In [8], [15], [19], [20], [36], [45], the authors use an information-theoretic approach to study HARQ. The analysis in these papers is based on [29], where the assumption is that the number of bits in each transmission round is sufficiently large.…”

Section: A Approximationmentioning

confidence: 99%

Energy Optimization For Hybrid ARQ With Turbo Coding: Rate Adaptation and Allocation

Zhang

Milstein

Cosman

2020

IEEE Trans. Veh. Technol.

View full text Add to dashboard Cite

We consider incremental redundancy (IR) hybrid automatic repeat request (HARQ) over independent block-fading channels with turbo coding. We consider different cases of channel state information (CSI) at the transmitter: the transmitter has no knowledge of any CSI, or knows the CSI in previous transmission rounds through a perfect feedback channel, or knows both current and previous CSI. The transmitter decides the forward error correction code rate based on the CSI it has. We minimize the energy consumption of turbo-coded HARQ, subject to a packet loss rate constraint. Numerical results show that the energy consumption of HARQ decreases when more CSI information is available at the transmitter. We also compare IR combining with Chase combining and the system without combining, and IR combining yields the least energy consumption.

show abstract

“…• We consider the so-called multi-bit feedback to adapt the coding rates to the channel state experienced by the receiver in the past transmission rounds of HARQ. The same idea was exploited already e.g., in [3], [6], [9], [11], [12], [26]- [31]. The assumption of multi-bit feedback not only simplifies the optimization but also yields the results which may be treated as the ultimate performance limits of any adaptation schemes when the instantaneous CSI is not available at the transmitter.…”

Section: Introductionmentioning

confidence: 98%

Adaptive Cross-Packet HARQ

Jabi

Benyouss

Treust

et al. 2017

IEEE Trans. Commun.

View full text Add to dashboard Cite

In this work, we investigate a coding strategy devised to increase the throughput in hybrid ARQ (HARQ) transmission over block fading channel. In our approach, the transmitter jointly encodes a variable number of bits for each round of HARQ. The parameters (rates) of this joint coding can vary and may be based on the negative acknowledgment (NACK) provided by the receiver or, on the past (outdated) information about the channel states. These new degrees of freedom allow us to improve the match between the codebook and the channel states experienced by the receiver. The results indicate that significant gains can be obtained using the proposed coding strategy, particularly notable when the conventional HARQ fails to offer throughput improvement even if the number of transmission rounds is increased. The new cross-packet HARQ is also implemented using turbo codes where we show that the theoretically predicted throughput gains materialize in practice, and we discuss the implementation challenges.

show abstract

Rate Selection Algorithms for IR Hybrid ARQ

Cited by 11 publications

References 6 publications

Adaptive Incremental Redundancy for HARQ Transmission with Outdated CSI

Adaptive Incremental Redundancy for HARQ Transmission with Outdated CSI

Energy Optimization For Hybrid ARQ With Turbo Coding: Rate Adaptation and Allocation

Adaptive Cross-Packet HARQ

Contact Info

Product

Resources

About