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This paper presents a bit-level parallel communication interface used for inter processor communication separated on different printed circuit boards. A high performance board-to-board communication interface is important in modern supercomputers and portable computers or gadgets with multiple screen displays. We propose a recalibrated transmitter and receiver soft IP cores to support asynchronous...
In this paper, an adiabatic based vernier time-to-digital converter (VTDC) is proposed. Generally, static based vernier TDC consumes more power due to two delay chain and D-flipflop. To avoid this issue an adiabatic based vernier TDC is proposed. This proposed TDC is constructed by using adiabatic inverter and D-flipflop but in classical TDC architecture consists of static based inverter and D-flipflop...
This paper presents a floating point arithmetic modules which are useful for many real time applications such as FFT processor where complex butterfly operations are performed, in which precision and accuracy play a pivotal role in bio-medical and signal processing applications. When compared to fixed point representation, floating point arithmetic provides high precision which helps in increasing...
In this paper, we propose a high accuracy multi-chain time interval measurement (TIM) technique by employing the dedicated carry chain of FPGA. According to the principle of delay chain time to digital converter (TDC), the proposed method is realized by connecting the selectors inside the slices. The resolution of the delay chain method is limited by the time delay of one delay unit. To break through...
Efficient content retrieval is crucial for Named Data Delay Tolerant Networking (NDDTN). Previous studies have shown that using social properties reasonably can improve availability of forwarding data packets, reduce overhead and delay. In this paper, a forwarding strategy, called RIF based on Region of Interest (ROI), is proposed and put forward for NDDTN. RIF computes cumulative visiting time and...
Information centric networking (ICN) is one of the emerging Internet paradigms proposed to overcome the shortcoming of the current host-centric Internet. With ubiquitous in-network caching, ICN can facilitate content delivery and reduce network delay. In this paper, we propose a novel collaborative caching scheme based on routers' position to cache popular videos on the edge routers which are closer...
In this paper, a STGM (system testability growth model) considering the rectifying process of TDLs (testability design limitations) are proposed. Firstly, the simulation result based on a set of testability test data indicates that the delay relation between identifying and removing process of TDLs obeys a Bell-shaped curve. Furthermore, the TGM based on a Bell-shaped curve(Gamma curve) is studied...
This paper is concerned with power and rate control for wireless communication networks with nonlinear channel fading. A new mathematical model of power and rate control system is derived, and a robust power and rate controller is designed based on sliding mode control. A sufficient condition for the existence of stable sliding surfaces is established via linear matrix inequality, and the controller...
Standardization bodies such as IEEE and 3GPP, as well as other interest groups, are in the process of defining and standardizing different functional subdivisions within mobile network base stations, primarily to reduce the data rate requirements imposed on the transport architecture by 4th and 5th generation mobile systems. Ethernet is considered the leading candidate for the transport architecture...
Datacenter networks are becoming crucial foundations for our information technology based society. However, commercial datacenter infrastructure is often unavailable to researchers for conducting experiments. In this work, we therefore elaborate on the possibility of combining commercial hardware and simulation to illustrate the scalability and performance of datacenter networks. We simulate a Datacenter...
Network connectivity has a big impact on the performance of a vehicular ad hoc network (VANET). This paper studies the network connectivity problem in a VANET and focuses on the analysis of the downlink connectivity probability within the two-hop coverage of an RSU in a network scenario where data is broadcast from RSUs to all vehicles in the network. An analytical model is derived to calculate the...
Device-to-device (D2D) communication allows mobile devices to directly communicate with each other without infrastructures. It is considered as a promising solution to improve communication performance such as spectral efficiency and network capacity of the fifth generation (5G) wireless communication systems as well as LTE-Advanced (LTE-A) systems. It generally requires D2D discovery and data communication...
Vehicular Delay Tolerant Networks (VDTNs) routing protocols is a hot research topic in the global context of Intelligent Transport Systems (ITS). To cope with the intermittent connectivity of vehicular communications, numerous protocols based on Store Carry and Forward (SCF) paradigm were designed, ranging from an adaptation of generic Delay Tolerant Networks (DTNs) to those specifically dedicated...
In this paper our first achievements are reported on application of input command shapers for control of quadcopters with suspended load. Simulation results are presented for a free 2DoF quadcopter. The flight control system, consisting of two PID controllers and of a static nonlinearity mapping the propellers thrusts to particular degrees of freedom, is augmented by input shapers in the feedforward...
This paper presents a novel startup circuit that provides a startup operation for bias circuits and reference circuits. The proposed circuit employs delay buffer and series transistors to automatically turn off the startup circuit after the bias circuit has started. Thus, the proposed startup circuit consumes no power during the normal operation of the reference circuit and is useful for low-power...
This paper presents a generalised new formula for impulse-invariant transformation which can be used to convert an nth-order Discrete-Time (DT) ΔΣ modulator to an nth-order equivalent Continuous-Time (CT) ΔΣ modulator. Impulse-invariant transformation formulas have been published in many open literature articles for s-domain to z-domain conversion and vice-versa. However, some of the published works...
A standard priority-queuing system is capable of arranging packets with different traffic classes to guarantee a relatively low latency for the high priority traffic. However, in practical cases, severe delay may be caused by starting a large, low-priority frame ahead of a time-critical frame. In this paper, interspersed express traffic is evaluated, which enables preemption of non-time-critical transmission,...
For pursuing the high speed information transmission, the design and research of the high speed SerDes circuit are actively developing now. Due to the requirements for long transmission path, intensive equalization and high speed transmission circuit testing function, two high speed SerDes circuits are designed and fabricated based on 130nm SiGe BiCMOS technology. One is for the research of the equalization...
The increasing multimedia traffic and limited spectrum resource in Geosynchronous (GEO) satellite systems starve for an efficient Call Admission Control (CAC) scheme, which aims to provide acceptable Quality of Service (Qos) to massive users, however, the throughput may not be guaranteed. In order to maximize the total throughput of communication system, a dynamic CAC scheme, named Maximizing Throughput...
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