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The coexistence of multimedia services in e-communication systems, with varying bandwidth utilization characteristics, impedes the efficiency of rate control and thereby impacts on the Quality of Service (QoS), in terms of low throughput. As such, the rate control for multimedia flows remains an open problem. This paper proposes a memetic optimization approach to rate allocation of multiclass services...
Information infrastructures such as Internet have been a great success in the past few decades and gradually become mature, diversified user requirements continue to grow at a fabulous speed. Multiplex services on secure networked environments are now deemed as an application licensed to customers for use as a trustworthy service on demand. The flexible reconfiguration network is the next step to...
UWB Communication Systems have recently attracted considerable research effort for their potential advantages of high data rate and low energy density. As one of the key components of an UWB system antennas with wide impedance bandwidth, stable gain and VSWR are required. Bow-Tie antenna is a good choice of UWB antennas. In this paper a Bow-Tie antenna is designed and modeled by using WIPL-D for a...
Dynamic and partial reconfiguration allows to place on line the various tasks that describe an application, in available regions of an FPGA. This new feature leads notably to communication problems since tasks are not present in the matrix during all computation time. In this article, we compare popular interconnection architectures. From this study, the DRAFT network is designed to support the communication...
We propose an ANSI/IEEE-754 double precision floating-point matrix-vector multiplier. Its main feature is the capability to process efficiently both dense matrix-vector multiplications (DMVM) and sparse matrix-vector multiplications (SMVM). The design is composed of multiple processing elements (PE) and is optimized for FPGAs. We investigate theoretically the boundary conditions when the DMVM equals...
We present a protocol for maintaining a spanning tree that is maximal with respect to any given (bounded and monotonic) routing metric. This protocol has two interesting adaptive properties. First, the protocol is stabilizing: starting from any state, the protocol stabilizes to a state where a maximal tree is present. Second, contrary to other approaches, the protocol converges in O(L * deg) time,...
In data-intensive computing, an important problem that has received relatively little attention is of transparent processing of data stored in remote data repositories. Interesting load balancing considerations arise for these scenarios. Particularly, based on where data is generated and how it is shared, a dataset of interest can be divided across multiple data repositories, which may be geographically...
Memory Wall is a bottleneck of enhancing the performance of computer system. How to reduce Memory Access Latency is a problem that we have to deal with. In order to enhance the bandwidth and reduce the latency, MAS optimization utilizes the characters of DRAM to reschedule the memory access. In this paper, we make deep research on MAS (memory access scheduling) algorithm of DDR2 Memory Access Controller,...
In this work we study the effect of data locality on the performance of Gaussian 03 code running on a multi-core non-uniform memory access (NUMA) system. A user-space protocol which affects runtime data locality, through the use of dynamic page migration and interleaving techniques, is considered. Using this protocol results in a significant performance improvement. Results for parallel Gaussian 03...
Various cryptographic puzzle schemes are proposed as a defense mechanism against denial of service attack. But, all these puzzle schemes face a dilemma when there is a large disparity between the computational power of attackers and legitimate clients: increasing the difficulty of puzzles might unnecessarily restrict legitimate clients too much, and lower difficulty puzzles cannot sufficiently block...
A new protocol, called Bi-Fair bandwidth Estimation congestion Control Protocol (Bi-FECP), is proposed in this paper. Bi-FECP explicitly estimates the fair bandwidth both in routers and end-hosts. The fair bandwidth estimated in routers is delivered to the end-hosts using the congestion header. The end-hosts adjust their sending rate according to the two estimated values of fair bandwidth. The performance...
SMS-based queries and responses are exchanged between mobile stations and central database servers in many contemporary client-server applications through point-to-point short message service (SMS-PP). Control plane signalling between different nodes of public land mobile network (PLMN) is much larger than message sizes in SMS-PP. Congestion in mobile network is caused by upsurge in signalling bandwidth...
For high frequency design of SoC systems, cascaded crossbar switches become more and more popular. In this paper, we present a method based on FFT-butterfly architecture. This method can provide optimal topology of cascaded crossbar switches, which consists of multiple small crossbar switches. We apply it to AMBA3 AXI-based bus system design. Experimental results show that the proposed methods allow...
BitTorrent has emerged as an effective peer-to-peer application for digital content distribution in the Internet. However, selecting peers in BitTorrent for efficient content distribution still poses a number of challenges due to high heterogeneities of peers with varied rates of uploading bandwidth and dynamic content. This paper presents GA-BT, a genetic algorithm based peer selection optimization...
A design method of a second-order adaptive-bandwidth all-digital phase-locked loop (ADB-ADPLL) is developed. Based on a discrete-time analogy of a continuous-time PLL (CTPLL) with the z-transform, the design criterion of the ADB-ADPLL is derived. With an ADB-ADPLL, the loop bandwidth and lock-in time are balanced. According to the design criterion, the ratio of the loop noise bandwidth to the reference...
This paper presents an approach to design a novel dual-band power divider based on coupled-lines. The proposed circuit features a simple planar structure with wide bandwidth performance for small frequency ratio. Closed-form design equations with one degree of design freedom are derived using even- and odd-mode analysis. For verification purpose, both simulated and measured results of a microstrip...
Fast recovery from failures and efficient allocation of link capacities in a network for guaranteeing seamless communication services are two primary goals of network survivability design. Shared backup path protection (SBPP) technique has been shown to be a promising solution to tackle these problems, due to sharing capacity among protection paths. The level of capacity sharing that can be achieved...
UWB (Ultra Wide Band) technology is a reliable transmission scheme for wireless communication with high data rates. It is called as impulse radio, impulse radar or carrier free ultra high resolution scheme. UWB is defined as signals with fractional band width more than 20% of its central frequency or as signals with bandwidth more than 500 MHZ. UWB can be characterized with ultra-short duration pulses...
This paper analyzes the two-way Wilkinson power dividers using coupled lines as ??/4 impedance transformer to have more compact layout. The analysis shows that the input port matching is only influenced by the even mode impedance of the coupled lines. Once the even mode impedance is fixed, all other specifications of the power divider are determined by the odd mode impedance of the coupled lines....
The fear of spectrum scarcity in licensed bands or the poor coexisting behavior in unlicensed bands demands the exploration of new resource sharing strategies. As a solution, dynamic spectrum access (DSA) is being addressed to allocate already assigned but sparsely used frequency bands to secondary users without causing any significant interference to primary users. It exploits opportunities in temporal...
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