Evaluation of OFDM(A) Relaying Protocols: Capacity Analysis in Infrastructure Framework

Riihonen, Taneli; Wichman, Risto; Werner, Stefan

doi:10.1109/tvt.2011.2175257

Cited by 24 publications

(26 citation statements)

References 45 publications

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“…• Step 3: Substitute the optimal power levels derived in (20) into (18). Thus, the dual problem becomes…”

Section: ) Dual Decomposition Methods and Optimal Solutionmentioning

confidence: 99%

“…3 is the number of operations for the Hungarian method and ≈ 13KL is the number of operations for expressions (20), (22), and (23). Thus, the total complexity of the dual decomposition is ≈ I × (KL) 3 + 13KL .…”

Section: Complexity Analysis Of the Proposed Resource Allocation Smentioning

confidence: 99%

“…Indeed, OFDMA system with relaying is considered as a fundamental solution for emerging cellular systems to ensure coverage and maintain connectivity [20], especially with MRs for vehicular communications. In [15], the authors investigated a utility-based power allocation problem at a BS communicating with a MR in high-speed railway wireless networks, while jointly considering the power allocation along the time and the packet allocation among services.…”

mentioning

confidence: 99%

“…In other words, the optimization problem is infeasible in these regions. Therefore, based on the closedform expression of the allocated transmit power given in (20), we aim to optimize the choice of the inter-BS distance d BS to avoid communication interruption and ensure a seamless handover between the different BSs. …”

mentioning

confidence: 99%

See 3 more Smart Citations

Transmit Power Minimization and Base Station Planning for High-Speed Trains with Multiple Moving Relays in OFDMA Systems

Ghazzai

Bouchoucha

Alsharoa

et al. 2016

IEEE Trans. Veh. Technol.

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“…• Step 3: Substitute the optimal power levels derived in (20) into (18). Thus, the dual problem becomes…”

Section: ) Dual Decomposition Methods and Optimal Solutionmentioning

confidence: 99%

Section: Complexity Analysis Of the Proposed Resource Allocation Smentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Transmit Power Minimization and Base Station Planning for High-Speed Trains with Multiple Moving Relays in OFDMA Systems

Ghazzai

Bouchoucha

Alsharoa

et al. 2016

IEEE Trans. Veh. Technol.

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“…Under the GDF scheme, the relay performs decode-forward on the entire group of subcarriers jointly. These two schemes were also introduced in [37] under different names. But they were not treated with optimal power allocation.…”

Section: Introductionmentioning

confidence: 99%

Optimal power allocation for a full-duplex multicarrier decode-forward relay system with or without direct link

2017

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a b s t r a c tThis paper addresses power allocation problems for a dual-hop full-duplex multicarrier decode-forward relay system with or without a direct link from the source to the destination. The full-duplex relay has a residual self-interference proportional to its transmitted power. We consider two schemes of decodeforward at the relay: carrier-wise decode-forward (CDF) and group-wise decode-forward (GDF). For the CDF scheme, we consider problems of optimal power allocation subject to system-wise total power constraint, node-wise individual power constraint and system-wise rate constraint, respectively. All these problems are shown to be equivalent to convex problems, and fast algorithms for finding the exact solutions are developed. For the GDF scheme, we focus on the case of node-wise individual power constraint. This problem is non-convex for which we develop fast algorithms for finding locally optimal solutions. Using the algorithms developed in this paper, we are able to show that the system capacity with optimal power allocation based on either CDF or GDF is higher than that of the half-duplex relay (HDR) system at power levels where HDR outperforms the direct transmission via the direct link. Furthermore, the system capacity based on GDF is consistently higher than that of HDR for all power levels while both have the same degree of freedom. This paper also shows new insights of algorithmic development, which should be useful for other related problems.

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Protocol design and data detection for two‐way relay networks with fractional asynchronous delays

Fang

Liang

Zhang

et al. 2012

Int J Communication

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SUMMARYIn wireless two‐way relay systems, it is difficult to achieve perfect timing synchronization among different nodes. In this paper, we investigate relaying protocol design and data detect schemes for asynchronous two‐way relaying systems to combat the intersymbol interference caused by asynchronous transmission. We consider fractional asynchronous delays and two schemes are proposed based on cyclic prefixed single carrier block transmission, namely, the receiver frequency domain equalization scheme and relay synchronization and network coding (RSNC) scheme. In the receiver frequency domain equalization scheme, the relay simply amplifies the received signal and forwards to the two source nodes, and fractionally spaced frequency domain equalizer (FS‐FDE) is employed at the receiver to recover the transmit data. In the RSNC scheme, the asynchronous signals are resynchronized with an FS‐FDE at the relay node. The output signals of FS‐FDE are then demodulated and network coded before forwarding to the two source nodes. In this RSNC scheme, data detection at the source nodes is the same as that in synchronous networks because the asynchronous signals have already been synchronized at the relay node. Simulation results show that the performance of both schemes is almost the same as in the perfect synchronized two‐way relaying systems. Copyright © 2012 John Wiley & Sons, Ltd.

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Evaluation of OFDM(A) Relaying Protocols: Capacity Analysis in Infrastructure Framework

Cited by 24 publications

References 45 publications

Transmit Power Minimization and Base Station Planning for High-Speed Trains with Multiple Moving Relays in OFDMA Systems

Transmit Power Minimization and Base Station Planning for High-Speed Trains with Multiple Moving Relays in OFDMA Systems

Optimal power allocation for a full-duplex multicarrier decode-forward relay system with or without direct link

Protocol design and data detection for two‐way relay networks with fractional asynchronous delays

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