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In this paper, an extended large wireless network, with a single transmitter-receiver pair, under the secrecy constraint is considered. In contrast to works which use idealized assumptions, a more realistic network situation with unknown eavesdroppers locations is investigated: the legitimate users only know their own Channel State Information (CSI), not the eavesdroppers CSI. Also, the network is...
In this paper, we consider a collaborative beam-former (CB) design that achieves a dual-hop communication from a source to a receiver in highly-scattered environments, through a wireless network comprised of K independent terminals. The weights of the considered CB design at these terminals, derived to maximize the received signal-to-noise ratio (SNR) subject to constraint over the terminals' total...
In this paper, we consider a collaborative beamforming (CB) technique to achieve a dual-hop communication from a source surrounded by interferences to a receiver, through a wireless network comprised of independent terminals. The CB weights are designed so as to minimize the interferences plus noises' powers while maintaining the received power from the source to a constant level. We show, however,...
This paper proposes a novel distributed energy beamforming and information transfer (DEBIT) scheme for simultaneous information and power transfer in wireless networks. We focus on the design of the DEBIT scheme over multiway relay channels (MWRCs), where multiple users exchange information with an energy-harvesting amplify-and-forward relay node. We develop the optimal transmission strategy to maximize...
Alamouti distributed orthogonal space-time block coding has emerged as a diversity scheme that can achieve high spectral efficiency over a wireless networks. This paper employs the relay selection to maximize the received signal-to-noise ratio of Alamouti distributed orthogonal space-time block coding (Al-DSTC) in a two-relay networks. It makes collective use of the Alamouti distributed orthogonal...
Artificial noise has been considered as an effective and efficient way to improve the secrecy of wireless communications. However, most existing papers have been focused on the analysis of a single communication link between a transmitter and a legitimate receiver with some eavesdroppers. In this paper, we investigate the impact of artificial noise to the secrecy of a large scale decentralized wireless...
The problem of distributed coordination in multi-cell wireless network has been concerned in the research community recently due to its ability to enhance intended signal and mitigate interference in the system. In the previous research, the design of beamforming weights at transmitter has been addressed from the perspective of egoism and altruism concepts considering the tradeoff between egoistic...
In this paper we discuss techniques for Distributed Beamforming (DBF). We specify a generic communication scenario in which a DBF scheme should function to be of practical significance. We identify need for improvement in recently proposed DBF schemes in order to operate reliably in realistic scenarios, and propose a new algorithm which incorporates such improvements. We show by simulations that our...
The law of the time to transmit a packet from a node to its intended receiver, in a wireless network with randomly deployed, multiple-antennas equipped nodes, whose communication is impaired by fading and interference, is investigated. SINR-based coverage at the physical layer is assumed, and the useful signal strength is shaped through either cooperative or non-cooperative beamforming. In particular,...
We consider a relay network with multiple users and propose a signal-to-interference and noise-ratio (SINR) balancing based relay signal forwarding scheme. Each relay receives a combined signal from multiple sources and processes it using a complex valued scalar and transmits towards the destinations so that the SINR at the receiver of each user is maximised. We solve this problem using semidefinite...
Multicast beamforming is a challenging problem in wireless networks due to different channel conditions of users. The data rate of a multicast group is dominated by the achievable data rate of the worst case user. Beamforming in multicasting system can provide better performance by maximizing the minimum Signal to Noise Ratio over all receivers in a multi-antenna system. In this paper, we focus on...
A MIMO-OFDM PHY Integrated (MOPI) scheme is proposed to provide confidentiality against eavesdroppers in wireless networks. The proposed MOPI scheme prevents any eavesdropper from learning the channel state information (CSI) of the wiretap channel and decoding the information being exchanged. This is achieved by the use of channel sounding combined with a novel physical-layer network coding (PNC)...
We study distributed algorithms for adjusting beamforming vectors and receiver filters in multiple-input multiple-output (MIMO) interference networks, with the assumption that each user uses a single beam and a linear filter at the receiver. In such a setting there have been several distributed algorithms studied for maximizing the sum-rate or sum-utility assuming perfect channel state information...
This paper studies energy and throughput performance of cooperative routing in wireless networks that support cooperative beamforming at the physical layer. Cooperative beamforming is a form of cooperative communication in which multiple nodes each equipped with a single omnidirectional antenna coordinate their transmissions in such a way that the individual signals constructively combine at the intended...
Spatial interference cancelation based on zero-forcing beamforming significantly improves the throughput of a mobile ad hoc network. Nevertheless, the performance of spatial interference cancelation can be degraded by imperfect channel estimation at receivers. We analyze the impact of inaccurate channel state information (CSI) on network transmission capacity by modeling transmitters as a Poisson...
Secondary spectrum usage has the potential to considerably increase spectrum utilization. In this paper, quality-of-service (QoS)-aware spectrum underlay is considered. A multi-antenna access point transmits common information to a set of secondary receivers, by means of appropriate beamforming; the objective is to maximize the multicast beamforming rate (or, equivalently, minimize the signal to noise...
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