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Real-time video communications has been incorporated into many instant communication tools such as ichat, Skype, QQ, etc. Real-time video communications has low delivery delay requirement, which imposes great challenge to the provisioning of such services. To address this problem, in this paper, we propose a selective redundant transmission mechanism to support real-time streaming on multi-interface...
Visible light communications (VLC) technology has recently emerged as a complementary technology to the indoor radio frequency (RF) networks. While the backhauling of the indoor RF networks has been supported by fiber optics, the backhauling of the VLC network is still an open research problem. Power line communications (PLC) has been considered as a possible solution for the VLC networks due to its...
This paper evaluates the impacts of pulse shapes and modulation format on energy and power consumption for wireless body area networks (WBANs) based on ultra wideband (UWB). Microelectronic devices (e.g., sensors, transceivers, etc.) are components of this network, used to monitor biological signal activities in vicinity, over the body or by implants. An impulse radio (IR) is addressed for this purpose...
This paper presents the design and evaluation of a mobile data service which exploits parallel multi-path transmission over multiple cellular networks to achieve significant performance gains. Multi-network access is motivated by the fact that multi-radio mobile devices are fast becoming a reality, making it possible for end-users to increase their service speed and availability via network diversity...
The future wireless broadband technologies will offer bandwidth intensive services such as rich voice and high definition multimedia. The aggregate bandwidth requirement at base station of a wireless broadband network is the sum of bandwidth requirements from various services viz., VoIP, browsing, e-mail, streaming multimedia, interactive gaming etc. Due to variation in rates of arrival of service...
The radiation performance of a circularly polarized (CP) single probe-fed truncated corner square microstrip patch has been enhanced by employing (i) a metal (PEC) ring contouring the patch on the patch side of the CP antenna, and (ii) a multi-section ring defect in the ground plane (GP) of the CP antenna. The concept has been validated by designing a CP patch with a conventional GP, a CP patch with...
Asynchronous event-triggered control (AETC) is a control strategy proposed for wireless networked implementations whose sensor nodes have limited energy supplies. Local thresholds allow the sensors to sample and to transmit local measurements independently of each other. AETC uses only one bit for each measurement transmission while still guarantees stability and predesigned performance of the closed-loop...
In this paper different strategies are proposed for customizing the new LTE-U commercial protocol for multi-mission tactical networks. The LTE-U (LTE-Unlicensed) approach leverages dual connectivity with licensed and unlicensed carrier aggregation combined to traffic steering techniques. In our proposed system named ‘LTE-UTac’ the unlicensed channel is either used in parallel to the licensed channel...
The mobility and Internet of Things (IoT) explosion has led to a severe wireless spectrum shortage which led to seeking new ways to alleviate the bandwidth crunch. Globally, wireless devices are becoming pervasive and consume network capacity and bandwidth at accelerated rates. Fourth generation (4G) networks based on the Long Term Evolution (LTE) offers significant upgrades over 3G in terms of data...
Multipath TCP (MPTCP) is an evolvable technology for bandwidth aggregation on a mobile device. MPTCP naturally and concurrently exploits wireless links via different interfaces (i.e., Wi-Fi and cellular) for data transferring. Theoretically, the MPTCP's aggregated throughput is better or at least equals to the TCP throughput over a link. However, our investigation of MPTCP performance in a lossy wireless...
As the number of wireless devices, services, communication standards and respective modes of operation rapidly grows, the design of reconfigurable digital baseband processing systems for radio devices becomes more important and challenging. Long Term Evolution (LTE) is among the most relevant wireless systems in 4G communications and its waveform is OFDM-based. According to the LTE mode of operation,...
A compact Printed 2.4GHz band-pass filter using inductance-capacitance (LC) resonator is implanted and measured. The proposed filter is designed by using LC resonator to avoid the limitation of the physical wavelength for reducing filter size. For improving filter performances, the quality factors of the lump elements are optimized. The measured results show minimum insertion loss is 0.59 dB in 2...
In recent years, the deployment of wireless short-range devices has increased dramatically, especially in urban settings with high density buildings. This is causing high levels of interference at the ISM bands, thus deteriorating performance. However, there is spectrum being unused and if the devices could make opportunistic use of available channels in other bands (OSA) it will improve their performance...
Heterogeneous networks, where small cells are deployed over the conventional macrocell networks provide a fast, flexible, cost-efficient, and fine-tuned design and expansion for existing cellular wireless networks to satisfy the ever increasing demand for network capacity. In HetNets, small cells offload users and their associated traffic from congested macrocells to provide better service to users...
Seamless computing and service sharing in community networks (CNs) have gained momentum due to the emerging technology of community network micro-clouds (CNMCs). However, deploying and running services in CNMCs confront enormous challenges to cope with, such as the dynamic nature of micro-clouds, limited capacity of nodes and links, asymmetric quality of wireless links, geographic singularity based...
This paper examines the low-probability-of-exploitation (LPE) characteristics of a noncontiguous orthogonal frequency division multiplexing (NC-OFDM) system. NC-OFDM transmission is similar to OFDM transmission but only uses a subset of the frequencies either to avoid incumbent transmissions or due to tactical considerations. This paper considers an NC-OFDM transmission with a given set of active...
Multi-path routing concept was largely exploited in wireless networks to provide benefits such as fault tolerance, load balancing, performance improvement in terms of latency, etc. In this paper, we propose a multi-path routing based protocol named MP-IMRR (Multi-path Intra-Mesh infrastructure Routing protocol) to improve our previously defined QoS based routing protocol for wireless mesh networks...
In this paper, fully controlled interference cancellation module (ICM) for an 18 GHz 2 × 2 line-of-sight (LoS) multiple input, multiple output (MIMO) system is presented. A 2 × 2 LoS MIMO hardware prototype with a 110 MHz channel bandwidth and data rate of 250 Mbps per path (total of 500 Mbps) was fabricated in the 18 GHz band. In the 16-QAM digital modulation test, the experimental results show that...
Live virtual machine migration aims at enabling the dynamic balanced use of the networking/computing physical resources of virtualized data-centers, so to lead to reduced energy consumption. Here, we analytically characterize, prototype in software and test an optimal bandwidth manager for live migration of VMs in wireless channel. In this paper we present the optimal tunable-complexity bandwidth...
One of the promising techniques to enhance MAC efficiency is orthogonal frequency division multiple access (OFDMA). Even though OFDMA-based WLAN allows multi-user transmissions, it requires a careful design of resource management particularly in densely deployed WLANs. To address this problem, we propose a two-phase resource allocation (TPRA) algorithm. In TPRA, an access points (AP) determines its...
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