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In recent years, the number of appliances connected to the Interned has steadily increased thanks to the wide popularity of WÌFÌ/3G enabled mobile devices. This has led to an increase of multimedia resource consumption, causing traffic overload problems for classic resource providers. Different solutions have been studied to shift this traffic overhead from the server(s) towards the client(s) through...
The exponential growth of audiovisual and textual data is aggressively leading to the creation of tools and systems capable of selecting and recognizing given patterns of information. Such urge is at the basis of the development of machine learning techniques, techniques that are today employed to analyze all kinds of information. Computer gaming is, with no doubt, one of the fields where such techniques...
The elevation beamforming and spatial multiplexing are promising approaches to increase throughput for user equipments (UEs) in high-rise buildings in cellular networks. However, the 3-dimensional propagation characteristics with the UEs located at different heights have been less explored. In this paper, we present field measurements on the indoor-to-outdoor (I20) uplink channel in a typical urban...
Microbial communities play a significant role in bioremediation, plant growth promotion, human and animal digestion, drive elemental cycles, the carbon-cycle and cleaning water. They are also posed to be the engines of renewable energy via microbial fuel cells which can reverse the process of electrosynthesis. While the diffusion of chemical signals in the surrounding medium of biological systems...
Traditional battery-powered wireless sensor networks face many challenges to meet the requirements of a wide range of demanding applications nowadays due to their limited energy. Although energy harvesting techniques can scavenge energy from the environment to sustain network operations, dynamics from the energy sources may lead to service interruption or performance degradation when the sources are...
The security of user applications largely relies on the proper execution of the underlying operating system. However, existing commodity OSes are inevitably vulnerable due to their enormous code base containing a whole bunch of bugs that can be easily exploited by attackers. In such situations, a proper way of protecting users' data privacy and integrity at runtime is a paramount task that needs efficient...
In this paper we present Local Group Connected Dominating Set (LG-CDS) algorithm which can be used in conjunction with SMF protocol for multicasting in MANETs. LG-CDS performs distributed election of relays for connecting members of locally located groups using only two-hop neighborhood information. It is worth noting that the algorithm can be tuned to elect redundant relays to improve fault tolerance...
To assist drivers and prevent collisions, we propose a system called OmniView that extends driver's vision in all directions, using cameras of multiple collaborating smartphones in the surrounding vehicles. OmniView provides a driver with a traffic map about the relative positions of surrounding vehicles. Under OmniView, each vehicle detects other vehicles in its view, estimates their relative positions,...
In cognitive radio networks, when secondary users transmit in the null space of their interference channel with primary user, they can avoid interference. However, performance of this scheme depends on knowledge of channel state information for secondary user to perform inverse waterfilling. We evaluate the effects of imperfect channel estimation on error rates and performance degradation of primary...
In our research, we analyze the group conversation in Twitter via. second screen concerning two popular US based TV shows, categorize the postings into four different classifications, and investigate the predominant categories for group interactions. The group conversations are identified by hashtags present in tweets where the number of members in the group interacting is at least two. The classifications...
Non-binary low-density parity-check (NB-LDPC) codes over GF(q) (q > 2) have better error-correcting performance than their binary counterparts when the codeword length is moderate. In this paper, a modified trellis-based Min-max decoder is proposed for NB-LDPC codes. By relaxing the constraints on which messages can be included, the trellis syndrome computation is simplified without sacrificing...
RAID schemes have been in use for hard disk drives to provide improved performance or fault tolerance. RAID schemes, particularly RAID 2 and higher comprise of striping and adding parity. For solid state drives (SSDs), to combat die failures, schemes like RAID 5 and RAID 6 are effective. The idea is to have block level striping with distributed parity to provide data recovery in case of single or...
We consider spectrum sensing strategies used to discover available spectrum in Cognitive Radio Networks (CRNs), using both non-cooperative sensing and cooperative sensing approaches. After introducing the background to sensing techniques, this position paper focuses on strategies and algorithms for conducting sensing such that the sensing time and energy are minimized, and the likelihood of finding...
Ubiquitous communication is being envisioned as the daunting feature in the next generation of cellular networks. However, it comes with the price tag of humungous energy consumption, a significant fraction of which is due to the base stations within a service area. In this paper, we propose a cooperation technique among base stations in a cellular network that reduces their energy consumption. Our...
Full-dimensional multiple input multiple output (FD-MIMO) is a practical implementation of massive MIMO in cellular communication systems. FD-MIMO relies on a planar array of active antenna systems (AAS) at the base stations to harvest the benefits of both azimuth and vertical beamforming. In this paper, we analyze the network performance of per-user vertical beamforming with a special focus on the...
A number of switch fabric architectures based on mini-router grids (MRG) have been proposed as a replacement of buses for system-on-chip communication, as well as a replacement of crossbars for network routers. The rationale for using MRGs in switch fabrics is that they provide high delivery ratios, low latencies, high degree of parallelism and pipelining, load balancing properties, and sub-quadratic...
In this paper a novel method for synchronization and cell search in 3GPP LTE downlink (DL) system has been proposed. This method performs the symbol timing and physical-layer cell identity estimation in frequency domain with less complexity, utilizing the frequency domain properties of the primary and secondary synchronization signals. The primary synchronization signals have good orthogonal and frequency...
This paper considers a network in which a primary user (PU) may cooperate with a cognitive radio (CR) user for transmission of its data packets. The PU is assumed to be a buffered terminal operating in a time-slotted fashion. We develop an energy-efficient protocol that involves cooperation and coordination between primary and secondary users. To satisfy certain quality-of-service requirements, users...
Dynamic Spectrum Access (DSA) is a successful solution for the spectrum scarcity problem. In DSA, unlicensed users can gain access to licensed spectrum in a way that does not harm the licensed transmission. Many technical solutions are proposed to efficiently facilitate DSA. This paper analyzes the benefits of using cooperative relaying technique on the spectrum occupancy for the unlicensed transmissions...
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