On the Benefits of Partial Channel State Information for Repetition Protocols in Block Fading Channels

Tuninetti, Daniela

doi:10.1109/tit.2011.2158467

Cited by 49 publications

(106 citation statements)

References 14 publications

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“…This essentially stems from the difference between the energy and the spectral efficiencies. The energy efficiency is in fact a ratio of spectral efficiency to the long term average power [37], so it would be significantly affected by transmission powers. As opposed to [18, Fig.…”

Section: A Numerical Verificationmentioning

confidence: 99%

Energy-Efficient Optimization for HARQ Schemes Over Time-Correlated Fading Channels

Shi

Yang

et al. 2018

IEEE Trans. Veh. Technol.

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Abstract-Energy efficiency of three common hybrid automatic repeat request (HARQ) schemes including Type I HARQ, HARQ with chase combining (HARQ-CC) and HARQ with incremental redundancy (HARQ-IR), is analyzed and joint power allocation and rate selection to maximize the energy efficiency is investigated in this paper. Unlike prior literature, time-correlated fading channels is considered and two widely concerned quality of service (QoS) constraints, i.e., outage and goodput constraints, are also considered in the optimization, which further differentiates this work from prior ones. Using a unified expression of asymptotic outage probabilities, optimal transmission powers and optimal rate are derived in closed-forms to maximize the energy efficiency while satisfying the QoS constraints. These closed-form solutions then enable a thorough analysis of the maximal energy efficiencies of various HARQ schemes. It is revealed that with low outage constraint, the maximal energy efficiency achieved by Type I HARQ is 1 4 ln 2 bits/J, while HARQ-CC and HARQ-IR can achieve the same maximal energy efficiency as κ∞ 4 ln 2 bits/J where κ∞ = 1.6617. Moreover, time correlation in the fading channels has a negative impact on the energy efficiency, while large maximal allowable number of transmissions is favorable for the improvement of energy efficiency. The effectiveness of the energy-efficient optimization is verified by extensive simulations and the results also show that HARQ-CC can achieve the best tradeoff between energy efficiency and spectral efficiency among the three HARQ schemes.Index Terms-Energy efficiency, time-correlated fading channels, hybrid automatic repeat request, power allocation and rate selection.

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Section: A Numerical Verificationmentioning

confidence: 99%

Energy-Efficient Optimization for HARQ Schemes Over Time-Correlated Fading Channels

Shi

Yang

et al. 2018

IEEE Trans. Veh. Technol.

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“…According to the reward-renewal theorem [16], the longterm average consumed power is the ratio between the average transmit power between two consecutive renewals (sending a new data packet) E CSI K [P ] and the expected number of transmissions E CSI K [T ] needed to deliver the packet with up to K transmission attempts [8], [17] …”

Section: Optimization Problemmentioning

confidence: 99%

“…In [8], a power adaptation was proposed to increase the throughput in the case of a discretized CSI. An asymptotically optimal power control algorithm that attains the diversity limit in long-term static channels has been presented in [9].…”

Section: Introductionmentioning

confidence: 99%

Outage-optimal power adaptation and allocation for truncated HARQ

Jabi

Szczeciński

Benjillali

et al. 2014

2014 IEEE International Conference on Communications (ICC)

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In this work, we analyze hybrid ARQ (HARQ) protocols used over independent block fading channels. We assume that the transmitter is unaware of the channel state information (CSI) at the moment of transmission but knows the statistics of the channel. We consider two scenarios with respect to the feedback received by the transmitter: (i) "conventional", one-bit feedback carrying the message about the decoding success/failure (ACK/NACK), and (ii) the multi-bit feedback scheme when, on top of ACK/NACK, the receiver feeds back information about the state of the decoder, which is equivalent to the CSI experienced by the receiver in the past (unsuccessful) transmissions. The feedback can then be used to allocate power across the HARQ transmission attempts (in the case of one-bit feedback) or adapt the power for each re-transmission as a function of multibit feedback. The objective in both cases is the minimization of the outage probability under peak and long term average power constraints. We solve the optimization problems using the dynamic programming framework. The obtained results quantify the advantage of the multi-bit feedback over the conventional approach and indicate that power optimization can provide significant gains over the conventional constant-power HARQ transmission even in the presence of peak-power constraints.

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“…From another perspective, hybrid automatic repeat request (HARQ) is a well-known approach applied in wireless networks to increase the data transmission reliability and efciency [12]- [20]. The main idea behind the HARQ techniques is to reduce the data outage probability or increase the throughput by retransmitting the data that underwent bad channel conditions.…”

Section: Introductionmentioning

confidence: 99%

Spectrum sharing via HARQ feedback and adaptive power allocation

Makki

Eriksson

Svensson

2014

2014 IEEE Wireless Communications and Networking Conference (WCNC)

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Recently, substantial attention has been paid to improve the spectral ef ciency of communication setups using different spectrum sharing techniques. This paper studies the throughput of spectrum sharing channels utilizing hybrid automatic repeat request (HARQ) protocols. Considering different HARQ schemes, the unlicensed user throughput is obtained under an outage probability constraint for the licensed user. The outage-limited throughput is obtained for both independent and spatially-correlated fading conditions, where there is spatial dependency between the fading coef cients. The results show that, using HARQ and adaptive power allocation, the maximum throughput is achieved by combination of simultaneous transmission and interference-avoiding spectrum sharing paradigms. The performance of the spectrum sharing networks is not sensitive to spatial correlation, within the practical range, and the throughput changes are negligible at low/moderate correlations. Finally, there is considerable potential for data transmission of the unlicensed user with limited performance degradation of the licensed user.

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On the Benefits of Partial Channel State Information for Repetition Protocols in Block Fading Channels

Cited by 49 publications

References 14 publications

Energy-Efficient Optimization for HARQ Schemes Over Time-Correlated Fading Channels

Energy-Efficient Optimization for HARQ Schemes Over Time-Correlated Fading Channels

Outage-optimal power adaptation and allocation for truncated HARQ

Spectrum sharing via HARQ feedback and adaptive power allocation

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