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We describe and demonstrate a fully distributed algorithm that enables prioritized TCP flows to allocate network resources (bandwidth) among themselves. The algorithm does not require any explicit communication among the different TCP flows. It enables autonomous adaptation to loss of network resources due to cyber attack or failure, while ensuring that users receive prioritized utility from available...
SAR equipment can now benefit from direct conversion techniques. This paper will present some new components which facilitate direct conversion to and from Land S bands, these include : Single core, 10 and 12 bit Analog to Digital converters (ADC) with a sample rate of 1.5GSps and an analog bandwidth of 2.3GHz giving excellent performance in the L band; A Digital to Analog converter (DAC) with a 3GSps...
The Tightly Coupled Accelerators (TCA) architecture that we proposed in previous work enables direct ommunication between accelerators over nodes. In this paper, we present a proof-of-concept GPU cluster called the HA-PACS/TCA using the PEACH2 chip that we designed as an interconnection router chip based on the TCA architecture. Our system demonstrated 2.0 ?sec of latency on inter-node GPU-to-GPU...
Software Defined Networks (SDNs) have opened up a new era for networking by decoupling the control and data planes. With a centralized controller, the process of updating networks becomes much more convenient when compared to traditional networks. However, even with SDNs, transitional network states during network updates may still cause problems. Such states may result in a breakdown of isolation...
One of the main obstacles that impede further expansion of Tor, the most popular anonymous communication system, is its large performance variance. The problem becomes worse when bandwidth-intensive applications, such as video streaming, contend with latency-sensitive applications, such as web browsing, for the scarce resources. Most of the existing solutions involve circuit-scheduling techniques...
Optical fibre being a backbone of modern communication has provided simplified service provisioning, supported a wide range of new bandwidth applications, high speed and data rate, but they are prone to high power consumption. This concern attracted many to come up with methods of energy efficient strategies, different policies and protocols. As the demand of data, voice, and information processing...
WiMAX technology supports to different MAC and Physical Layer parameters. The performance of TCP Linux in WiMAX network is analyzed by varying MAC layer and Physical layer parameter such as channel bandwidth, cyclic prefix, modulation coding scheme, frame duration, DL: UL ratio, propagation model, full duplex mode of data transfer and other operating parameter such as downloading traffic. These parameters...
Transmittivity of one-dimensional defected photonic crystal is analytically computed for normal and oblique incidences of electromagnetic wave. Presence of defect is considered in both the layers of unit cell (GaN/AlxGa1−xN), and result is compared with that obtained for ideal structure. Transfer matrix technique is used for computation purpose, and structural parameters are varied within practical...
Network Coding-enabled wireless networks are vulnerable to data pollution attacks where adversary nodes inject into the network polluted (i.e. corrupted) packets that prevent the destination nodes from decoding correctly. Even a small proportion of pollution can quickly propagate into other packets via re-coding, occurred at the intermediate nodes, and lead to resource waste. Therefore, during the...
Currently, Advanced Driver Assistance Systems (ADAS) require high bandwidth of in-vehicle application. Ethernet has attracted attention for using in-vehicle networks because it provides 100Mbit/s bandwidth. However the legacy Ethernet cannot guarantee Quality of Service (QoS) for in-vehicle networks because priority is not provide. IEEE802.1Q (802.1Q) and IEEE802.1AVB (AVB) of the IEEE802 Ethernet...
The existing in-vehicle networks are not capable of accommodating increased data in vehicle and the demand of bandwidth. Next generation networks require higher bandwidth and shorter latency. Therefore, inexpensive and high bandwidth ethernet have be studied. IEEE802.1 Audio Video Bridging (AVB) is the standard used to transmit Audio and Video streaming data with guaranteed Quality of Service (QoS)...
Recently, cognitive radio technology has been a lot of attention to improve bandwidth efficiency. In this paper, we propose an adaptive bandwidth management scheme based on the mechanism design and negotiation theory. According to the user`s utility, QoS and trust value, the proposed scheme allocates total resources while dynamically controlling the selfish users. In addition, proposed scheme is able...
The paper presents methodology for analyzing compliance of Impulse Radio Ultra-Wideband (IR-UWB) communications systems with regulatory limits specified by US Federal Communications Commission (FCC). First, discrete spectral component that reduce Effective Isotropic Radiated Power (EIRP) in IR-UWB spectrum are analyzed in an exemplary IRUWB system. After that, a minimal Pulse Repetition Frequency...
Within the RiSEM project (Seismic Risk of Monumental Building) two different kinds of GPR measurements were performed. The first one was carried out by using an ultra dynamic range — ultra high resolution GPR in order to investigate the presence of hypogeal structures under the “Piazza della Cisterna” (Cistern Square). The second one was carried out by using a non contact 4–8 GHz GPR system specifically...
To meet the challenge of the ever-growing traffic volume in current wireless communications, ultra-dense network (UDN) deployment with high system capacity has attracted wide attention in recent years. However, existing researches on UDN mainly focus on system throughput while ignore energy efficiency (EE). Therefore, we will analyze the UDN performance including not only system throughput but also...
In two-tier heterogeneous cellular networks (HCN) where small cells are deployed overlaid with macro cells, base station (BS) association is one of the fundamental problems, which becomes even more challenging when the small cell BSs are connected to the gateways via imperfect backhaul links, e.g. using wireless technologies. In this paper, we first analyze the mean packet delay in radio access and...
In this work, we investigate the minimum power of transmitting Gaussian multiterminal sources over the Gaussian multiple access channel (MAC) with bandwidth expansion. Distributed encoders observe the individual components of the multiterminal sources and attempt to describe them to a central decoder. Instead of assuming the sources and the channel have matched bandwidth, we consider the scenario...
In this paper, a secure single-side-band (SSB) generation using two fractional Hilbert transformers (FHT) is presented. First, the SSB signal generation methods using conventional Hilbert transformer (HT) and one FHT are reviewed. Then, to improve the security, a more secure SSB generation method using two FHTs is proposed. The phase angles of two FHTs can be used as the secure keys for construction...
This paper presents a novel multipath load balancing algorithm called priority-based adaptive weighting (PAW) for video over software defined networks (SDN). Based on priority differentiation among video packets, PAW adopts a per-packet strategy to distribute ingress video packets over the multiple egress ports of an entry SDN-switch connecting to those output links leading to the same IP destination,...
In this paper we propose a digital blind calibration scheme for Time-Interleaved ADCs based on transfer function mismatch which corrects gain, time-skew and bandwidth mismatch errors. The estimation of mismatches uses an adaptive filtering structure with a lowpass filter combined to a fractional delay filter. The compensation is based on the development of a matrix approach to cancel the effect of...
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