Outage Performance of Decode-and-Forward in Two-Way Relaying With Outdated CSI

Hyadi, Amal; Benjillali, Mustapha; Alouini, Mohamed‐Slim

doi:10.1109/tvt.2015.2388489

Cited by 20 publications

(15 citation statements)

References 25 publications

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“…The blue and red dashdotted curves represent the achievable rate of x 1 and x 2 with ipSIC/pSIC for TWR-NOMA, respectively, which considers IS between A 1 and A 2 at the relay. The blue and red solid curves represent ergodic rates of x 1 and x 2 with ipSIC/pSIC according to (22), (23) and (25), (26), respectively. We can observe that the ergodic rates of x 1 and x 2 with pSIC are larger than that of x 1 and x 2 with ipSIC.…”

Section: Numerical Resultsmentioning

confidence: 99%

Modeling and Analysis of Two-Way Relay Non-Orthogonal Multiple Access Systems

Yue

Liu

Kang

et al. 2018

IEEE Trans. Commun.

119

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A two-way relay non-orthogonal multiple access (TWR-NOMA) system is investigated, where two groups of NOMA users exchange messages with the aid of one half-duplex (HD) decode-and-forward (DF) relay. Since the signal-plusinterference-to-noise ratios (SINRs) of NOMA signals mainly depend on effective successive interference cancellation (SIC) schemes, imperfect SIC (ipSIC) and perfect SIC (pSIC) are taken into account. In order to characterize the performance of TWR-NOMA systems, we first derive closed-form expressions for both exact and asymptotic outage probabilities of NOMA users' signals with ipSIC/pSIC. Based on the derived results, the diversity order and throughput of the system are examined. Then we study the ergodic rates of users' signals by providing the asymptotic analysis in high SNR regimes. Lastly, numerical simulations are provided to verify the analytical results and show that: 1) TWR-NOMA is superior to TWR-OMA in terms of outage probability in low SNR regimes; 2) Due to the impact of interference signal (IS) at the relay, error floors and throughput ceilings exist in outage probabilities and ergodic rates for TWR-NOMA, respectively; and 3) In delay-limited transmission mode, TWR-NOMA with ipSIC and pSIC have almost the same energy efficiency. However, in delay-tolerant transmission mode, TWR-NOMA with pSIC is capable of achieving larger energy efficiency compared to TWR-NOMA with ipSIC.

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Section: Numerical Resultsmentioning

confidence: 99%

Modeling and Analysis of Two-Way Relay Non-Orthogonal Multiple Access Systems

Yue

Liu

Kang

et al. 2018

IEEE Trans. Commun.

119

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“…Based on (15), we have: . Same to the discussion in (20) and (21), it holds that: +∞ 0 m·e A ·P[γ k,i |γ k,i] √ 2π(log 2 e) 2 (1−2 −2C(γ k,i ) ) t·m 1 2 (C(γk,i)−ri) (1−2 −2C(γ k,i ) ) 1 2 log 2 e dγ k,i > 0. Hence, ∂ 2 C FBL ∂ 2 r i < 0.…”

Section: Appendix a Proof Of Propositionmentioning

confidence: 75%

Optimal Scheduling of Reliability-Constrained Relaying System Under Outdated CSI in the Finite Blocklength Regime

Schmeink

Gross

2018

IEEE Trans. Veh. Technol.

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Under the assumption of outdated channel state information (CSI) at the source, we consider the finite blocklength (FBL) throughput of a two-hop relaying system. Previous work has considered this setting so far only for the infinite blocklength case, where decoding can be arbitrarily reliable as long as operating below the Shannon limit. In contrast, in the FBL regime residual decoding errors can not be avoided even when transmitting below the Shannon limit. This makes the scheduling problem at the source more vulnerable to transmission errors, where we investigate the trade-off between the choice of so called scheduling weights to avoid transmission errors and the resulting coding rate. We show that the corresponding maximization of the throughput under a reliability constraint can be solved efficiently by iterative algorithms. Nevertheless, the optimal solution requires a recomputation of the scheduling weights prior to each transmission. Thus, we also study heuristics relying on choosing the scheduling weights only once. Through numerical analysis, we first provide insights on the structure of the throughout under different scheduling weights and channel correlation coefficients. We then turn to the comparison of the optimal scheduling with the heuristic and show that the performance gap between them is only significant for relay systems with high average signal-to-noise ratios (SNR) on the backhaul and relaying link. In particular, the optimal scheduling scheme provides most value in case that the data transmission is subject to strict reliability constraints, justifying the significant additional computational burden. Index Termsdecode-and-forward, finite blocklength, optimal scheduling, outdated CSI, relaying.

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“…For the asymptotic results, the simplified expressions given in (17), (18), and (22) are used. Moreover, the DBPSK ABEP performances have been evaluated using (19) and (23) for perfect and outdated CSI, respectively. Finally, the processing complexity of the proposed scheme will be also evaluated by employing the approach that has been also followed in [25].…”

Section: Numerical Results and Performance Evaluationmentioning

confidence: 99%

User selection scheme with limited feedback processing and outdated CSI in multiuser relay networks

Bithas

Rontogiannis

2016

Wireless Communications

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A new user selection strategy is investigated and analyzed in a multiuser relaying environment in the presence of co‐channel interference. The proposed selection scheme aims at avoiding unnecessary feedback load processing, in cases where a target threshold, in the received instantaneous signal‐to‐noise ratio, is exceeded. Assuming that perfect channel state information is available, closed‐form lower bound expressions are derived for the cumulative distribution function of the output signal to interference plus noise ratio. Moreover, the impact of outdated channel state information on the system's performance is also investigated. In addition, under the assumption of high signal‐to‐noise ratio conditions, simplified approximated expressions are also provided for the cumulative distribution functions of the output signal to interference plus noise ratio, which are employed to study the outage probability and bit error probability performance of the system. It is shown that with the proposed approach, a significant reduction in feedback load processing is achieved, with only a slight loss in performance. Copyright © 2016 John Wiley & Sons, Ltd.

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Outage Performance of Decode-and-Forward in Two-Way Relaying With Outdated CSI

Cited by 20 publications

References 25 publications

Modeling and Analysis of Two-Way Relay Non-Orthogonal Multiple Access Systems

Modeling and Analysis of Two-Way Relay Non-Orthogonal Multiple Access Systems

Optimal Scheduling of Reliability-Constrained Relaying System Under Outdated CSI in the Finite Blocklength Regime

User selection scheme with limited feedback processing and outdated CSI in multiuser relay networks

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