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Video streaming over vehicular ad hoc network (VANET) provides accurate information about road traffic situation, digital services requested by drivers and passengers, compared to textual messages. Video dissemination in VANET is considered as a hard task because of high dynamic topology of vehicles, stringent requirements of video like real time transmission and the volatility of wireless medium...
To support the emerging next era of mobile wireless networks, researchers have made a great deal of efforts in investigating promising techniques in multimedia services - the statistical quality-of-service (QoS) technique, which has been proved to be effective in statistically guaranteeing delay-bounded video transmissions over the time-varying wireless channels. On the other hand, as the 5G- promising...
This paper studies a full-duplex filter-and-forward (FD-FF) relay system in frequency-selective channels. Conventionally, the loop-back signal at the FD relay is treated as harmful self- interference and needs to be significantly suppressed via both analog- and digital-domain cancellation. However, the performance of the conventional self-interference cancellation approach is fundamentally limited...
In a massive machine type communication (massive MTC) network, wireless connections between machine type devices (MTDs) and eNodeBs are unreliable due to the interference caused by uncoordinated access of other MTDs. Furthermore, it is with a high probability that the retransmission from the outage source MTD will fail again due to the spatiotemporally correlated interference. In this paper, we design...
The next generation mobile communication system (5G) needs to address the challenges stemming from the performance requirements in diverse technical scenarios, such as low power massive connections for machine type communications (MTC). Heterogeneous Network (HetNet) has been identified as a promising network architecture for 5G. In HetNets, traffic offloading can be exploited to effectively improve...
In this paper, we study a wireless-powered communication network (WPCN) scenario, in which a multiple antenna amplify-and-forward (AF) two-way relay coordinates power transfer and information exchange to multiple pairs of users. A harvest-then- transmit protocol is assumed where the relay first transmits energy signals to the users in a power transfer phase. Multi-pair of users, which have rechargeable...
In VANET (Vehicular Ad Hoc NETwork), the act of transferring important information is a main concern in every routing protocol conception. Hence, selecting next packet relay is crucial decision for the network performances. The highly dynamic topology of VANET which is result of the frequent changes in vehicles' positions, their speeds and the unpredictable drivers' directions at intersections mostly...
In this paper, we consider a renewable energy powered wireless relay node which can work in either full- duplex (FD) or half-duplex (HD) mode. It decodes and stores data bits sent from source node, and then transfers them to destination node. We aim to maximize the average throughput from source to destination by optimizing the relay's working mode under the random energy arrival constraint. Optimal...
In this paper, we consider the secure connection problem in multihop wireless networks with full-duplex (FD) jamming relaying, where the colluding eavesdroppers are randomly distributed following a homogeneous Poisson point process (PPP). By applying FD, each legitimate node (including relay and destination) jams the eavesdroppers when it receives the desired signal from transmitter. We adopt the...
In this paper, the secrecy outage probability of cooperative cyclic prefixed single carrier (CP-SC) systems with multiple transmitters and unreliable backhaul connections is derived. The transmitters communicate with the destination in the presence of an eavesdropper over two-hop relay channels with non-identical frequency-selective fading. The existence of asymptotic limits on the secrecy outage...
In this paper, we propose a secure transmission protocol for two users exchanging their respective information in an n-hop MIMO Ad hoc network. By exploiting the properties of the transmission medium in the physical layer, three channel models are utilized to provide secure transmission, namely one-way relay channel, two-way untrusted relay channel, and multiple access channel. Using these channel...
The formula E = Pt still hold true as we forge ahead in our unending quest to extend power lifetime in e-Health wireless sensors. Our research work proposes predictive MAC manipulation and intelligent node clustering with associated algorithms to further lower the energy consumption of e-Health devices equipped with wireless sensors. Predictive manipulation of MAC involves powering on and off the...
We consider the problem of estimating the latency of a feasible but unused Autonomous System-level path on the Internet. This problem arises in evaluating the overhead incurred by censorship and surveillance circumvention schemes that alter the Internet routing infrastructure, and the cost of attacks against such schemes. Since these paths are not advertised by the current routing infrastructure,...
Non-orthogonal multiple access (NOMA) is a promising multiple access technique for future wireless communications as it results in high spectral efficiency. NOMA differs from recently adopted orthogonal multiple access techniques in that it superimposes multiple data flows at the same time and same frequency band but with different power levels, and resorts to the successive interference cancellation...
The rapid development of the Internet of Things (IoT) has brought big challenges to the traditional cellular networks such as super dense devices and deep fading channels. These new challenges will lead to a significant transmission efficiency degradation and increase the device's power consumption, especially in the uplink. A huge pressure will be also imposed to the enhanced Node B's (eNB) scheduler...
After big disasters, a damaged area can be out of contact because of severe damage of existing network infrastructures. Meanwhile, high demands for network connections to the disaster area will arise to collect damage information and disseminate rescue instructions. In this paper, we propose to construct a network for disaster management using mobile stations equipped with sensors and network interfaces...
We propose and design a lattice coded physical- layer network coding (PNC) over a finite complex number field Z[ω]/ξZ[ω] in a two-way relay channel (TWRC). In our design, we construct the lattice codes from an irregular repeat- accumulate (IRA) code over GF(q). A randomly generated coset is employed to our scheme to ensure that the codes exhibit permutation invariance and...
This paper investigates a wireless energy harvesting cooperative network (WEHCN) consisting of a source, a decode-and-forward (DF) relay and a destination. We consider the relay as an energy harvesting (EH) node equipped with EH circuit and a rechargeable battery. Moreover, the direct link between source and destination is assumed to exist. The relay can thus harvest and accumulate energy from radio-frequency...
The increasing number of connected vehicles in densely populated urban areas provides an interesting opportunity to counteract the high wireless data demands in high density and highly mobile scenarios. The idea is to support the macro base station (BS) with a secondary communication tier composed of a set of smart and connected vehicles that are in movement in the urban area. As a first step towards...
This paper investigates the energy efficient resource allocation for OFDM relay networks, where K users receive information via L helping relays. For such a system, an optimization problem is formulated to maximize the system energy efficiency (EE) by jointly optimizing the relay selection, subcarriers assignment and power allocation under the proportional rate constraints and available power constraint...
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