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In this paper, we investigate cyclic prefixed single carrier block transmission for asynchronous wireless relay networks. To avoid channel estimation at the receiver, a simple frequency-domain differential encoding and decoding scheme is proposed for asynchronous relaying. Specifically, a block-by-block frequency domain differential encoder is employed at the source node, while joint frequency domain...
In recent years, issues of Wireless Sensor Networks (WSNs) have been widely studied. The energy is limited in WSNs. However, it always takes much energy to achieve highly accurate time synchronization. In this paper, a Spanning Tree-based Energy-efficient Time Synchronization (STETS) strategy for WSNs is proposed. In STETS, only a small number of sensor nodes in the WSN have the privilege to send...
Acoustic source localization in sensor network is a challenging task because of severe constraints on cost, energy, and effective range of sensor devices. To overcome limitations in existing solutions, this paper formally describes, designs, implements, and evaluates a Hamming Distance-based Method for Acoustic Source Localization, i.e., HammingLoc, in distributed smartphone networks. The key idea...
This paper presents a mostly digital impulse radio (IR) ultra-wideband (UWB) transceiver for low power wearable and implantable biomedical devices. The UWB transmitter adopts carrier-less all-digital pulse generator with on–off keying (OOK) modulation, and uses an 11-bit Barker code for reliable communication in the frequency range of 0–960 MHz. The receiver is based on auto-threshold detection. The...
Operating system (OS) noise refers to the interference experienced by an application due to activities inside an operating system. OS noise can significantly hurt the performance of applications, especially parallel applications. We implemented a tool, noise test, to study the characteristics of OS noise on the Godson-3A shared-memory multicore platform running Linux. We found that OS noise was balanced...
Pipeline requires both low latency and high throughput. Synchronous pipeline achieves a near optimized throughput but suffers from the worst-case computation delay. Meanwhile, asynchronous pipeline keeps an optimized computation delay but suffers from the low throughput. In this paper, we present dual control path (DCP), a new structure of four-phase handshake asynchronous control path, to improve...
As a complex and time-critical system, railway interlocking system (RIS) is vital for the safe operation of a train in station. For the next generation RIS named Distributed Railway Interlocking System (DRIS), the synchronization issue between internal devices, which means the guarantee of a well-organized cooperation, plays an important role in ensuring trains' safety running. Therefore, as a prerequisite...
With the possibility of system crashes and network failures, the design of robust client/server interactions for collaborative process execution is a challenge. If a business process changes state, it sends messages to relevant processes to inform about this change. However, server crashes and network failures may result in loss of messages. In this case, the state change is performed by one party,...
In wireless body sensor networks (WBSN) and wireless body area networks (WBAN), sensor nodes have different bandwidth requirements, therefore, heterogeneous traffic is created. In this paper, we propose a statistical medium access control (MAC) protocol with periodic synchronization for use in heterogeneous traffic networks based on human body communication (HBC). The MAC protocol is designated to...
Two orchestrated processes interacting with each other have to maintain their own states. Messages are used to synchronize states between orchestrated processes. Server crash and network failure may result in loss of messages and therefore result in a state change performed by only one party. Thus, the states of the parties are no longer synchronized, resulting in state inconsistencies and in worst...
A synchronized sampling controller based on direct digital synthesis was developed in NIM China. It's used in the transfer standard for harmonic measurement. The working fundamental frequency of the controller is 45 to 65 Hz; the trigger output frequency is 11.5 kHz to 16.6 kHz due to the 256 times of the fundamental frequency. The resolution of the controller is less than 1 µHz.
A transfer standard of harmonic voltage and current based on the synchronized sampling technology was developed in NIM China. The working fundamental frequency of the transfer standard is 45 to 65 Hz; the highest order is within 50th; the range is 120 V and 5 A. The accuracy of the harmonic voltage is 30 µV/V (of the fundamental voltage) and the harmonic current is 40 µA/A (of the fundamental current).
This article has addressed the unidirectionally linear coupled approach and the synchronization problem of a new hyperchaotic systems with four-wing. Synchronization using linear coupled has been successfully applied to synchronize master and slave systems. We give the global synchronization theorem of the hyperchaotic systems with four-wing. The numerical simulation shows the efficiency of the linear...
Since capacitive equipment is widely installed in power system, it is very important to assess the insulation condition of capacitive apparatus. Synthetic relative measuring method in on-line monitoring of dielectric loss angle is an effective measure, which can greatly overcome the shortcomings of the traditional method and improve the measuring accuracy. The paper proposes a general method to watch...
Wide area measurements are becoming the basis of power system monitoring, protection and control. The frequency disturbance recorder (FDR) is actually a single-phase phasor measurement unit (PMU). It measures the voltage amplitude, angle and frequency from a single-phase 120-V wall outlet. Currently, the accuracy of synchrophasor measurements depends heavily on the precise time signal provided by...
This paper proposes a multi-hop synchronization protocol for multiple physiological information transmission over the body sensor network (BSN). A packet reconstitution mechanism was designed to achieve synchronous transmission. The experimental results validated the efficiency of the protocol on continuous real-time monitoring of multiple physiological parameters over multi-hop BSNs.
Superconductive rapid single flux quantum (RSFQ) digital computing system has the tendency to achieve the operating rate of several hundred GHz. Compare to the semiconductor partner, with the pulse width about picoseconds and clock rate of several hundred GHz, the timing uncertainty from fabrication process variations makes it impossible to achieve the large scale integrated chip with global synchronization...
A new sampling clock synchronization method using improved early-late gate and least-square fitting in OFDM system is proposed in this paper. Improved early-late gate is used to obtain symbol timing offset and least-square fitting works like a loop filter in the feedback branch which can be achieved by recursion. Recursion process is then amended to overcoming some shortcomings. Theoretical analysis...
Distributed control systems have been growing explosively and the fieldbus technology has been widely employed for networked data gathering system. However, few Field-bus is real time down to the I(Input)/O(Output) level and most of them have a large number of sub-systems. In this paper we introduce a novel high-speed industry Ethernet bus known as EtherCAT into data gathering system. A networked...
NCL X circuit is a very efficient way to implement the QDI circuit, which can get all the advantages of the asynchronous circuit, especially the average performance. But the NCL_X circuits suffer from its huge area overhead. To solve this problem, a method for optimizing the complete detection network in the NCL_X circuit has been introduced in this paper. Using this method can dramatically reduced...
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