Multiple Peer-to-Peer Communications Using a Network of Relays

Fazeli-Dehkordy, Siavash; Shahbazpanahi, Shahram; Gazor, Saeed

doi:10.1109/tsp.2009.2020002

Cited by 157 publications

(198 citation statements)

References 25 publications

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“…In recent years, collaborative relay beamforming algorithms for wireless communication networks with perfect channel state information(CSI) has been well studied to enhance the utilization of the network resources [1][2][3] . In these networks, multiple source-destination pairs (peer-to-peer) typically share a channel.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, a method based on semidefinite programming relaxation was proposed to calculate the distributed relay beamforming weights in [2]. To minimize the total transmit power of the network subject to quality-of-service(Qos) constraints at each destination, the problem of joint source power control and general rank relay matrix design was solved in [3].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A New Method for Robust Multiple Peer-To-Peer Relay Beamforming

Hou¹,

Du²,

Qi³

et al. 2015

Proceedings of the 4th International Conference on Information Technology and Management Innovation

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This paper focuses on how to design the robust beamforming vectors of multiple peer-to-peer relay networks. In the context of imperfect channel state information at the relays, our goal is to minimize the transmit power at relay nodes subject to the quality of service at each receiver. A method based on real value Lorentz-positive maps and linear matrix inequalities is proposed, which converts the transmit power minimization problem at relay nodes into a convex optimization problem. The proposed method overcomes the disadvantages of traditional methods based on semi-definite programming relaxation, which sometimes result in solutions with rank greater than one. Simulation results show that the solution of the proposed method is consistent with those of conventional method based on semi-definite programming relaxation.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Method for Robust Multiple Peer-To-Peer Relay Beamforming

Hou¹,

Du²,

Qi³

et al. 2015

Proceedings of the 4th International Conference on Information Technology and Management Innovation

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show abstract

“…The models discussing relay networks in [8][9][10][11][12] have been proposed to have a source, a relay, and a destination, where transmit DB is employed both at the source and at the relay. The authors in [8][9][10][11] have developed several DB techniques for relay networks with flat fading channels. In [12], frequency selective fading has been considered.…”

Section: Introductionmentioning

confidence: 99%

Distributed Beamforming with Nodes Selection for Cognitive Radio Networks

2014

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In order to collaboratively forward the Cognitive Radio (CR) signal to the Distant CR (DCR) users, we have introduced the Distributed Beamforming (DB) technique CR networks. However we face a practical difficulty of the extreme narrow main beam in the pattern generated by the DB method, when applying it to CR networks. To solve this problem, we propose a novel Nodes Selection (NS) method based on studies of the differences in beam width of a broadside array and an end-fire array. The proposed NS method selects those CR nodes, which are able to form a full size end-fire array and a reduced size broadside array. It chooses CR nodes located in the "belt" area along the direction of the DCR user. Simulation results of the average beampattern of our NS method show that the main beams are successfully directed towards the DCR users and are enlarged for practical applications in CR networks. What is more, for a CR network with a large physical size, our NS method can widen the main beam while maintaining sufficiently low sidelobe levels for CR transmission.

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“…The improved beam pattern and connectivity properties are shown in [8], and a reasonable beam forming performance affected by a node synchronization error is discussed in [9]. DB has also been introduced in relay communication systems [10][11][12][13][14]. In [10][11][12][13], several DB techniques for relay networks with flat fading channels have been developed, while in [14] frequency selective fading has been considered.…”

Section: Introductionmentioning

confidence: 99%

“…DB has also been introduced in relay communication systems [10][11][12][13][14]. In [10][11][12][13], several DB techniques for relay networks with flat fading channels have been developed, while in [14] frequency selective fading has been considered. DB requires accurate synchronization; in other words, the nodes must start transmitting at the same time, synchronize their carrier frequencies, and control their carrier phases so that their signals can be combined constructively at the destination.…”

Section: Introductionmentioning

confidence: 99%

Distributed beam forming with phase-only control for green cognitive radio networks

Lian

Nikookar

Ligthart

2012

J Wireless Com Network

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Cognitive radio (CR) is an intelligent radio system and is able to share the spectrum with licensed users (LU). By adopting adaptive beam forming techniques, CR can reuse the spectrum with LU via directing main beams towards CR users while displaying nulls towards LU. In this article, we present a new distributed beam forming (DB) technique, and study the performance of its application to decentralized CR networks. The presented DB method only controls the phase of the transmitted signal of each CR node in the CR network, and therefore, it is called phase-only DB (PODB) method. It can be implemented at each node independently with only prior knowledge of its own location, and directions of distant CR (DCR) users and LU. The average beam pattern and the average gains for an arbitrary number of CR nodes of PODB method are discussed, showing that CR nodes can constructively transmit signals to DCR users with less interferences to LU via employing the PODB method to form and direct main beams towards directions of DCR users while nulls towards directions of LU. PODB proves to be a green DB method by prolonging the lifetime of the CR network due to effective battery power consumptions at CR nodes. The cumulative distributed function of the beam pattern for a large number of CR nodes is derived and analysed to demonstrate that the PODB method increases the possibility that the transmitted power of the whole CR network at the directions of LU is lower than a certain threshold, which guarantees that CR network causes less disturbing effect to LU.Keywords: distributed beam forming, collaborative beam forming, cognitive radio networks, phase-only distributed beam forming, null-steering distributed beam forming, green cognitive radio networks

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Multiple Peer-to-Peer Communications Using a Network of Relays

Cited by 157 publications

References 25 publications

A New Method for Robust Multiple Peer-To-Peer Relay Beamforming

A New Method for Robust Multiple Peer-To-Peer Relay Beamforming

Distributed Beamforming with Nodes Selection for Cognitive Radio Networks

Distributed beam forming with phase-only control for green cognitive radio networks

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