New approaches for cooperative use of multiple antennas in ad hoc wireless networks

Luo, Jun; Blum, Rick S.; Greenstein, L.J.; Cimini, Leonard J.; Haimovich, Alexander M.

doi:10.1109/vetecf.2004.1400562

Cited by 95 publications

(64 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Communication may be interrupted in deep fading when the EM wave attenuation in the plasma sheath exceeds 30 dB (the attenuation coefficient in the plasma sheath is less than 0.001). Therefore, the optimal relay strategy is set to Equations (1)- (2) [17,18], and k is the number selected as the best satellite. …”

Section: Dynamic Selection Scheme Of Relay Nodes Based On a Channel Fmentioning

confidence: 99%

Dynamic Selection of Relay Node Based on Channel Fading Coefficient for Reentry Hypersonic Vehicles

Shi¹,

Jinxin²,

Li³

et al. 2017

PIER C

View full text Add to dashboard Cite

Abstract-The development of near-space hypersonic vehicles is confronted with the "blackout" problem of the plasma sheath. As electronic density on the leeward surface is lower than that on the windward surface during the reentry process, a low Earth orbit (LEO) satellite may be used to mitigate this problem. In this study, the Iridium system, as a low-orbit relay satellite system, is utilized to evaluate the feasibility of using a LEO satellite. First, the incident angle of the electromagnetic waves radiating from the vehicles to various potential relay satellites is calculated by the STK software. Second, the transmission coefficient of the electromagnetic wave in the plasma is obtained by using the equivalent wave impedance method to present the attenuation effect of the plasma sheath channel. Finally, the attenuation coefficients of each channel between the aircraft and the potential satellite are used as a parameter to select the best relay in the reentry process of the vehicles. Simulation results show that the use of LEO satellites for relay can significantly reduce the communication interruption time during the reentry process by 32.6% for typical scenarios.

show abstract

Section: Dynamic Selection Scheme Of Relay Nodes Based On a Channel Fmentioning

confidence: 99%

Dynamic Selection of Relay Node Based on Channel Fading Coefficient for Reentry Hypersonic Vehicles

Shi¹,

Jinxin²,

Li³

et al. 2017

PIER C

View full text Add to dashboard Cite

show abstract

“…In [10], two approaches for selecting a best relay are provided: Best-Select in the Neighbor Set and Best-Select in the Decoded Set. The BestSelect in the Neighbor Set algorithm is based on the average received SNRs, or equivalently the distance, while the latter is based on the instantaneous channel fading realization.…”

Section: Related Workmentioning

confidence: 99%

Distributed Relay-Assignment Protocols for Coverage Expansion in Cooperative Wireless Networks

Sadek

Han

Liu

2010

IEEE Trans. on Mobile Comput.

View full text Add to dashboard Cite

Abstract-One important application of cooperative communications is to extend coverage area in wireless networks without increasing infrastructure. However, a crucial challenge in implementing cooperation protocols is how to select relay-source pairs. In this paper, we address this problem based on the knowledge of the users' spatial distribution which determines the channel statistics. We consider two scenarios at the destination node, when the receiver uses MRC and when no-MRC is used. First, we characterize the optimal relay location to minimize the outage probability. Then, we propose and analyze the performance of two schemes: a distributed nearest neighbor relay assignment in which users can act as relays, and an infrastructure-based relay-assignment protocol in which fixed relay nodes are deployed in the network to help the users forward their data. The outage probabilities of these two schemes are derived. We also derive universal lower bounds on the performance of relay-assignment protocols to serve as a benchmark for our proposed protocols. Numerical results reveal significant gains when applying the proposed simple distributed algorithms over direct transmission in terms of coverage area, transmit power, and spectral efficiency. At 1 percent outage probability, more than 200 percent increase in coverage area can be achieved, 7 dBW savings in the transmitted power, and the system can operate at 2 b/s/Hz higher spectral efficiency.

show abstract

“…The energy-efficient broadcast problem in wireless networks has also been considered in [5]. In [6], the authors evaluated cooperative diversity performance when the best relay is chosen according to the average SNR, and the outage probability of relay selection based on the instantaneous SNR. In [7], the authors proposed a distributed relay selection scheme that requires limited network knowledge and is based on instantaneous SNRs.…”

Section: Introductionmentioning

confidence: 99%

Distributed Relay Selection and Power Control for Multiuser Cooperative Communication Networks Using Buyer/Seller Game

Wang

Han

Liu

2007

IEEE INFOCOM 2007 - 26th IEEE International Conference on Computer Communications

152

101

View full text Add to dashboard Cite

Abstract-The performances in cooperative communications depend on careful resource allocation such as relay selection and power control, but traditional centralized resource allocation needs considerable overhead and signaling to exchange the information for channel estimations. In this paper, we propose a distributed buyer/seller game theoretic framework over multiuser cooperative communication networks to stimulate cooperation and improve the system performance. By employing a two-level game to jointly consider the benefits of source nodes as buyers and relay nodes as sellers, the proposed approach not only helps the source smartly find the relays at relatively better locations and buy optimal amount of power from them, but also helps the competing relays maximize their own utilities by asking the reasonable prices. The game is proved to converge to a unique optimal equilibrium. From the simulation results, the relays in good locations can play more important roles in increasing source node's utility, so the source would like to buy more power from these preferred relays. On the other hand, the relays have to set the proper prices to attract the source's buying because of competition from other relays and selections from the source. Moreover, the distributed game resource allocation can achieve comparable performance compared with the centralized one.

show abstract

New approaches for cooperative use of multiple antennas in ad hoc wireless networks

Cited by 95 publications

References 7 publications

Dynamic Selection of Relay Node Based on Channel Fading Coefficient for Reentry Hypersonic Vehicles

Dynamic Selection of Relay Node Based on Channel Fading Coefficient for Reentry Hypersonic Vehicles

Distributed Relay-Assignment Protocols for Coverage Expansion in Cooperative Wireless Networks

Distributed Relay Selection and Power Control for Multiuser Cooperative Communication Networks Using Buyer/Seller Game

Contact Info

Product

Resources

About