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In this paper, we propose a novel visible light communications (VLC) system that can both achieves good performance in data transmission and environment perception. To be specific, based on the traditional VLC system, we develop a cooperative VLC scheme derived from the idea of clouding computing and machine learning. Afterwards, measurement for data transmission and algorithms for environment perception...
Due to the hardware cost and site constraints, the underwater transmission cannot be easily achieved in the terrestrial environment. In addition, network simulators also cannot precisely evaluate the network performance. As a result, a ZigBee-based Emulation Platform (ZEP) for underwater acoustic sensor networks is developed to estimate the network performance. Based on the evaluation results, some...
This letter addresses the problem of localization in a quasi-synchronous network using time-of-arrival (TOA) measurements. The object to be localized is passive, i.e., it is neither a transmitter nor a receiver. Unlike prior TOA-based algorithms, no perfect synchronization between the transceivers is assumed here. A two-step linear algorithm is proposed to jointly estimate the location of the passive...
The paper proposes a scheme of carrier synchronization in the large rate-of-change of Doppler frequency and low signal-to-noise ratio (SNR) communication environment. The scheme has two mainly parts: capture and tracking. In the capture part, it utilizes Discrete Fourier Transformation (DFT) and Quinn algorithm to estimate the initial frequency offset. In the tracking part, Maximum Likelihood Estimation...
The Cognitive Radio (CR) technology has emerged as a hot research area recently due to its high potential in addressing the spectrum underutilization problem. In this paper, the CR is applied to unauthorized CR users (CRUs) such that these nodes can access the 802.11 spectrum opportunistically to flexibly use the detected “spectrum holes,” with the ultimate goal of improving the 802.11 spectrum utilization...
Based on a regional position system, this paper developed a real-time and accurate regional positioning system gun-borne receiver with radio frequency, signal tracking, location estimation techniques. This paper analyzed the system structure, signal system, positioning theory of regional positioning system, and raised the overall program of the hardware system. The receiver used ARM microprocessor...
Transient electromagnetic signal not only attenuates slowly in the late stage, but also is weak and submerged in noise. According to analyzing the characteristics of transient electromagnetic signal, the new transient electromagnetic receiver utilizes a 24-bit A/D conversion technology, two_stage programmable amplification and low-pass-filter,combining vertical configuration of boards, for improving...
The Cognitive Radio (CR) technology is proposed for solving the spectrum underutilization problem and has gained great attention. By allowing unauthorized users to opportunistically access frequencies authorized to specific networks (called primary networks), the CR technology can increase the bandwidth utilization of the radio spectrum in a global perspective. In, the authors proposed a MAC protocol...
Today, Intelligent Transportation System (ITS) applications has made a great impact on improving the quality and efficiency of the transportation system. This achievement has attracted researchers to propose more ITS applications, particularly to improve the transportation safety through Vehicular Ad Hoc Networks (VANETs). The major difficulty faced by these researchers is the verification of their...
To facilitate the efficient allocation of limited transmit power, a bit error rate (BER) constraint based power allocation scheme is proposed in this paper for the downlink of multi-carrier code division multiple access (MC-CDMA) systems with linear minimum mean square error (MMSE) receiver. According to the instantaneous channel conditions, the proposed scheme can adaptively allocate the required...
A cloud-based, highly consumable queuing service must provide extreme scalability, flexible models of consistency, and high availability in the presence of network partitions. CAP theorem states that at most two of the three properties - Consistency, Availability, and Partition Tolerance - can be achieved at the same time for any shared data system. This paper presents the design and implementation...
RapidIO is an open standard that provides high-performance interconnect for chip-to-chip, board-to-board, and chassis-to-chassis communications. In this paper, we present an executable RapidIO interconnect in which an improved Buffer structure based on flow control is put forward. It helps to provide a smooth data flow, strong built-in error detection and error recovery mechanisms. It is tested to...
Signal integrity constraints of high-speed electronics have made multidrop electrical buses infeasible. This high-speed alternative uses hollow metal waveguides and pellicle beam splitters that interconnect modules attached to the bus. With 1 mw of laser power, the bus can interconnect eight modules at 10 gbps per channel and achieves an aggregate bandwidth of more than 25 gbytes per second with 10-bit-wide...
We describe a telecentric optical system for free-space multichannel optical interconnects. The targeted aggregate data rate is 240 Gb/s. We have a unique implementation of telecentric optics and achieved an optical link that is simple, robust and modular. The integrity of the optical link is not significantly degraded with a >plusmn2 mm translational misalignment between the transmitter and receiver...
The paper proposes a fragment and rate matching (FaRM) MAC protocol for wireless local area networks (LANs) to resist the frequent changing of channel quality and increase the network throughput. In wireless environments, channel quality varies with time. FaRM dynamically detects the current SNR to estimate the channel quality through the control frame exchanges. A Finite State Markov Chain (FSMC)...
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