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To reduce the average file delivery time under limited backhaul bandwidth, a fractional dynamic caching scheme, that coordinates the utilization of the backhaul and the cache storage, is proposed in this paper. In our scheme, only parts of the files are pre-fetched and stored in the static storage segment of small base stations (SBSs), while the remaining parts of the files will be fetched into the...
Caching at the edge is a promising technique to cope with the increasing data demand in wireless networks. This paper analyzes the performance of cellular networks consisting of a tier macro-cell wireless backhaul nodes overlaid with a tier of cache-aided small cells. We consider both static and dynamic association policies for content delivery to the user terminals and analyze their performance....
This paper studies energy-efficient joint transmit and receive beamforming in multi-cell multi-user multiple-input multiple-output systems. We consider conventional network energy efficiency metric where the users can receive unicasting streams in addition to the group-specific common multicasting streams which have certain rate constraints. The goal is to use the transmission resources more efficiently...
Irregular low-density parity-check (LDPC) codes are among the best codes currently known. Unfortunately, the performance of existing codes may deteriorate substantially with practical finite-precision decoder implementations. This motivates us to extend our previous work on finite-alphabet decoders based on look-up tables (LUTs) to irregular LDPC codes. We devise a joint design of the LUTs used for...
Unmanned aerial vehicle (UAV) is attractive for localization where global positioning system (GPS) satellites are uncapturable and wireless anchor nodes are unavailable. The advantage of localization using UAVs is their movability, that is, even when only few UAVs are available, if each of them ranges a target node many times from different locations, the localization accuracy can be improved, because...
The Compressed Sensing (CS) framework is heavily utilized to reduce data rate in hardware restricted scenarios by exploiting the intrinsic sparsity of the transmitted data. Considering multiple sensors at the same time, one variation of the Multi Channel (MC) framework takes several measurements at one time instant and then uses CS in the spatial domain to compress the data. This paper provides a...
In this paper, we investigate the problem of energy-efficiency for physical layer multicasting in multi-cell network under the assumption that only downlink channel distribution information (CDI) is available at the base station. Each BS, equipped with multiple antennas, uses a single beamformer to convey a common information to a group of single antenna users. The problem is formulated as the global...
Compressive random access scheme is considered one of promising candidates for future Machine Type Communications. It enables one-shot detection, which means that the preamble, channel estimation, and data detection could be carried out at once to keep signaling overhead low. For one-shot detection, improving the performance in terms of the number of successfully received preambles is necessary. To...
This paper considers the problem of dynamic support recovery for jointly sparse signals from underdetermined measurements. Unlike Multiple Measurement Vector (MMV) models that assume a fixed support for all time instances, we allow the support to vary temporally following a finite state Markov chain. Instead of using l1 minimization based algorithms, we cast the problem of dynamic support recovery...
Advances in microsystem technology have led to an increasing trend of cyber physical system integration into industrial environments for prognostic health monitoring. Harsh environmental conditions require wireless sensor nodes (WSNs) that are robustness and reliable whilst meeting the requirements of miniaturization, functional integrity and energy efficiency at the same time. Moreover design and...
Recently, crowdsourcing system has emerged as an effective platform for performing tasks. However, the workers in crowdsourcing systems are selfish and aim to strategically maximize their own benefit, which damages the system performance. In this paper, we model the interaction between workers as an iterated game to attract the participation of workers with high-quality services. We propose two zero-determinant...
Recent advancements in drone technology and base station miniaturization, together with an urgent need to reduce site rental costs, have created the unique opportunity to deploy cellular networks on a platform of mobile drones. This new development is redefining the wireless networks, as drone base stations can autonomously move in space to improve coverage and capacity of the network, tremendously...
Packet forwarding plays an important role in inter-vehicle communications. A predicted forwarding is a promising solution to address high mobility issues in a Vehicular Ad-hoc Network (VANET) as it increases the ratio of packet transmissions. The predicted forwarding scheme proposed, termed Vehicular-to-vehicular Urban Network (V2VUNet), is based on an angle measurement between a sender and a receiver...
Wireless Power Transfer (WPT) technology has witnessed huge development because of its convenience and reliability. This paper concerns the fundamental issue of wireless charger PLacement with Optimized charging uTility (PLOT), that is, given a fixed number of chargers and a set of points on the plane, determining the positions and orientations of chargers such that the overall expected charging utility...
Recent studies have suggested that the stability of peer-to-peer networks may rely on persistent peers, who dwell on the network after they obtain the entire file. In the absence of such peers, one piece becomes extremely rare in the network, which leads to instability. Technological developments, however, are poised to reduce the incidence of persistent peers, giving rise to a need for a protocol...
Signal decay is the fundamental problem of wireless communications, especially in an indoor environment where line-of-sight (LOS) paths for signal propagation are often blocked and various indoor objects exacerbate signal fading. There are three reasons for signal decay: long transmission distance, signal penetration, and reflection. In this paper, we propose OptRe which optimally places metallic...
Two related online problems: knapsack and truthful bipartite matching are considered. For these two problems, the common theme is how to ‘match’ an arriving left vertex in an online fashion with any of the available right vertices, if at all, so as to maximize the sum of the value of the matched edges, subject to satisfying a sum-weight constraint on the matched left vertices. Assuming that the left...
The paper presents an enhanced special module system for correcting codes based on Residue Number System. The research of algorithms hardware and time complexity for error detection and correction has been conducted on the basis of the Residue Number System correcting codes, using the proposed module system. Implementation of error detection and correction devices on the Field-Programmable Gate Array,...
Understanding the mobile user flow flux patterns is important for numerous applications relevant to crowd movement, from information sharing, networking, to security and public health. Particularly in instances of smart buildings and hospitals, among others, the flow between indoor locations, and mobility modeling within buildings is of a prime significance. Much of the mobility modeling studies have...
The Magnetic Induction (MI)-based communication techniques enable the applications of wireless sensor networks (WSNs) in complex environments, such as underground and underwater environments. However, the complex environments usually consist of many conductive objects that can significantly enhance or block the MI signals. Efficient communications can be achieved if we can smartly utilize the positive...
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