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To protect confidential communications from eavesdropping attacks in wireless networks, we propose a novel anti-eavesdropping scheme named AE-Shelter. In our proposed scheme, we place a number of friendly jammers at a circular boundary to protect legitimate communications. The jammers sending artificial noise can mitigate the eavesdropping capability of wiretapping the confidential information. We...
Millimeter wave (mmWave) communication has been a promising technology of future fifth generation (5G) cellular networks. Due to the tremendous propagation loss of mmWave communication, device-to-device (D2D) communications are widely used over directional mmWave networks to improve the network throughput. In this paper, a new time resource sharing scheme is proposed based on Stackelberg game for...
The future 5G cellular networks are expected to support several-fold increase in data traffic and number of devices, and provide a very low latency and gigabit-rate data services. millimeter Wave (mmWave) communication (30–300 GHz) is proposed to be an important part of the 5G cellular networks to fulfill these requirements. With most of the high data rate demands originating from indoor User Equipments...
For time critical updates, it is desirable to maintain the freshness of the received information. We address the impact of hostile interference on information freshness by formulating a non-zero-sum two-player game, in which one player is the transmitter aiming to maintain the freshness of the information updates it sends to its receiver, and the other player is the interferer aiming to prevent this...
Mission critical data dissemination in massive Internet of things (IoT) networks imposes constraints on the message transfer delay between devices. Due to low power and communication range of IoT devices, data is foreseen to be relayed over multiple device-to-device (D2D) links before reaching the destination. The coexistence of a massive number of IoT devices poses a challenge in maximizing the successful...
In this article, we investigate how the performance of Massive MIMO cellular systems can be enhanced by introducing D2D communication. We consider a scenario where the base station (BS) is equipped with large, but finite number of antennas and the total number of UEs is kept fixed. The key design question is that what fraction of users should be offloaded to D2D mode in order to maximize the aggregate...
Wireless energy harvesting (EH) is regarded as a promising energy supply alternative for energy-constrained wireless networks. In this paper, a new wireless EH protocol is proposed for an underlay cognitive radio (CR) network with multiple transceivers in a primary network (PN). Utilizing two-way amplify-and-forward (AF) relaying system as a secondary network (SN), both end-sources can harvest energy...
In this paper, we consider a centralized dynamic spectrum sharing system, in which dynamic spectrum allocation is accomplished in spectrum database. We consider a more realistic scenario, in which different users can access the same channel simultaneously within limited interference. Due to the users submitting the service requirements in a sequential manner, the current channel allocation result...
We considered a multi-user MIMO broadcast (BC) system with multiple antennas at both transmitter and receiver sides. A scheduling scheme using semi-orthogonal user selection (SUS) with zero-forcing beamforming (ZFBF) is implemented. The total feedback load required in ZFBF systems is reduced by implementing a two stage feedback scheme by restricting the number of users to participate in each stage...
In underwater acoustic sensor networks (UWASNs), several transmitters using the same power send data to the sink. Then, the sink will collect more interference because of the slow-fading of signal, due to this, a higher outage probability and high energy consumption occurs. Underwater wireless communication is quite difficult because of the factors like propagation delay, small available bandwidth,...
Non-orthogonal multiple access (NOMA) has been recently considered as a promising multiple access technique for fifth generation (5G) mobile networks as an enabling technology to meet the demands of low latency, high reliability, massive connectivity, and high throughput. The two dominants types of NOMA are: power-domain and code-domain. The key feature of power-domain NOMA is to allow different users...
We present a distributed algorithm for joint power control, routing and scheduling in multihop wireless networks. The algorithm also provides for Quality of Service (QoS) guarantees, namely, end-to-end mean delay guarantees and hard deadline guarantees, for different users. It is easily implementable and works by giving local dynamic priority to flows requiring QoS, the priority being a function of...
The concept of Wireless Body Area Network (WBAN) technology holds great potential for many applications such as continuous, remote, healthcare monitoring. Motion activities associated with the head reveal important physiological information about the health of the user. In order to develop a system capable of tracking and characterizing these activities, a fundamental understanding of the propagation...
The increase in the number of degrees of freedoms (DoF) that is afforded by multiple-input-multiple-output (MIMO) phased arrays is accompanied by an increase in hardware and computational costs. We mitigate this problem in a collocated MIMO phased array system by employing a selection strategy where a subset of K transmitter-receiver (Tx-Rx) pairs is chosen from the availableN pairs. We formulate...
Performance of OFDM (Orthogonal Frequency Division Multiplexing) systems is limited by inter carrier interference (ICI) under high Doppler scenarios such as that encountered in high speed trains like TGV. The use of multiple receive antennas is known to be a very effective way to combat ICI. In a recent publication, the authors explored the use of transmit (Tx) antennas for ICI mitigation. It considered...
The impressive growth of secrecy-sensitive wireless applications calls for methods to complement traditional cryptography. In particular, physical-layer security is attractive to enhance communication confidentiality by exploiting the characteristics of the wireless environment. Recent works on information-theoretic wireless network secrecy have shown how to exploit interference to enhance the level...
The achievable degree of freedom (DoF) boosting has been demonstrated on a single-input single-output (SISO) X channel by using outdated and instantaneous channel state information at transmitter (CSIT) synergistically, in contrast to that of using completely outdated CSIT. However, the means by which the DoF gain can be obtained in a multiple-input multiple-output (MIMO) system remains unclear. This...
The work in this manuscript proposes to enhance the secrecy level of wireless systems through the use of a jamming technique that uses uncorrelated reciprocal channel estimations from the legitimate channel as a common random source to select discrete jamming signals in both sides of the legitimate link. After that selection, these jamming signals are combined with data at the legitimate transmitter,...
We evaluate for the existing UHF U.S. TV stations two ways to increase the spectrum reuse to repack them in a smaller block without reducing the coverage or bandwidth of any TV station. One way is to increase the transmit power of each broadcaster's only transmitter by the same number of dB, and another more effective way is to replace that transmitter with a low-power low-tower (LPLT) Single Frequency...
Cognitive Radio Network (CRN) is a promising wireless communication solution whereby radio resources are automatically varied to optimize performance in the changing wireless environment. Our work focuses on distributed CRN with rational and independent users. The eventual state often reached in such a system is Nash Equilibrium (NE); multiple NEs with different performance exists. In this paper we...
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