scholarly journals Wireless Power and Data Transmission System of Submarine Cable-Inspecting Robot Fish and Its Time-Sharing Multiplexing Method

Electronics ◽  
2019 ◽  
Vol 8 (8) ◽  
pp. 838 ◽  
Author(s):  
Chen ◽  
Sun ◽  
Huang ◽  
Zhou ◽  
Meng ◽  
...  
Keyword(s):  
Data Transmission ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
High Efficiency ◽  
Transmission Mode ◽  
Modulation Method ◽  
Wireless Charging ◽  
Time Sharing ◽  
Submarine Cable ◽  
Robot Fish

In this paper, a hybrid system topology with one-way wireless charging function and the function of the bi-directional data communication is proposed for the problem of electric energy replenishment and data transmission faced by robot fish in the implementation of autonomous submarine cable inspection. Three working modes of the system and the time-sharing multiplexing method are studied. In the power transmission mode, high-efficiency wireless charging is realized by utilizing the transmission characteristics of a series–series (SS)-type resonant network which involves series resonant networks in both the primary side and the secondary side. In the alignment detection and handshake communication mode, the charging platform distance recognition and the handshake signal transmission are implemented through a series–parallel (SP)-type resonant network based on the ASK (amplitude shift keying) modulation method. In the high-speed data transmission mode, the reverse (secondary to primary) high-speed transmission of the inspection data is achieved through a SP-type resonant network based on the OFDM (orthogonal frequency division multiplexing) modulation method. The three modes share the same coupled coils via a reconfigurable resonant network. The working principle of the system is expounded, the system characteristics under each working mode are analyzed, and the time-division multiplexing control strategy is given. The rationality and effectiveness of the scheme are verified by experiments.

scholarly journals A Hybrid Vision Processing Unit with a Pipelined Workflow for Convolutional Neural Network Accelerating and Image Signal Processing

Electronics ◽  
2021 ◽  
Vol 10 (23) ◽  
pp. 2989
Author(s):  
Peng Liu ◽  
Yan Song
Keyword(s):  
Signal Processing ◽  
Data Transmission ◽  
High Speed ◽  
High Efficiency ◽  
State Of The Art ◽  
Vision System ◽  
Processing Unit ◽  
Processing Elements ◽  
Vision Processing ◽  
Field Programmable

Vision processing chips have been widely used in image processing and recognition tasks. They are conventionally designed based on the image signal processing (ISP) units directly connected with the sensors. In recent years, convolutional neural networks (CNNs) have become the dominant tools for many state-of-the-art vision processing tasks. However, CNNs cannot be processed by a conventional vision processing unit (VPU) with a high speed. On the other side, the CNN processing units cannot process the RAW images from the sensors directly and an ISP unit is required. This makes a vision system inefficient with a lot of data transmission and redundant hardware resources. Additionally, many CNN processing units suffer from a low flexibility for various CNN operations. To solve this problem, this paper proposed an efficient vision processing unit based on a hybrid processing elements array for both CNN accelerating and ISP. Resources are highly shared in this VPU, and a pipelined workflow is introduced to accelerate the vision tasks. We implement the proposed VPU on the Field-Programmable Gate Array (FPGA) platform and various vision tasks are tested on it. The results show that this VPU achieves a high efficiency for both CNN processing and ISP and shows a significant reduction in energy consumption for vision tasks consisting of CNNs and ISP. For various CNN tasks, it maintains an average multiply accumulator utilization of over 94% and achieves a performance of 163.2 GOPS with a frequency of 200 MHz.

Fractionally Spaced Frequency Equalization Method for Orthogonal Frequency Division Multiplexing (OFDM) Jointing with Modified Pilot Sequences

2012 ◽  
Vol 198-199 ◽  
pp. 1569-1572
Author(s):  
Ye Cai Guo ◽  
Qu Chen ◽  
Jun Guo ◽  
Xiao Li Miao
Keyword(s):  
Frequency Domain ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
High Efficiency ◽  
Interpolation Method ◽  
Linear Interpolation ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Single Carrier ◽  
Frequency Domain Response

In order to obtain accurate and high-speed data transmission, the orthogonal frequency division multiplexing(OFDM) technology is introduced and it is a kind of a multi-carriers modulation technology with high efficiency in the use of frequency band and characteristics of strong anti-interference ability. The fractionally spaced OFDM frequency domain equalization algorithm based on modified pilot sequences is proposed. In this proposed algorithm, one-dimensional linear interpolation method is used to estimate the frequency domain response of all subcarriers by part of the subcarriers’ frequency domain response with reducing the number of transmitted pilot sequences, and received signals are oversampled to acquire more detailed channel information. The computer simulations in underwater acoustic channel show that the performance of proposed method outperforms the single-carrier system and traditional OFDM system.

scholarly journals Towards 5G: A Photonic Based Millimeter Wave Signal Generation for Applying in 5G Access Fronthaul

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
S. E. Alavi ◽  
M. R. K. Soltanian ◽  
I. S. Amiri ◽  
M. Khalily ◽  
A. S. M. Supa’at ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Data Transmission ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Small Cells ◽  
Total System ◽  
60 Ghz ◽  
Wave Signal ◽  
Rf Signals ◽  
5 Ghz

Abstract 5G communications require a multi Gb/s data transmission in its small cells. For this purpose millimeter wave (mm-wave) RF signals are the best solutions to be utilized for high speed data transmission. Generation of these high frequency RF signals is challenging in electrical domain therefore photonic generation of these signals is more studied. In this work, a photonic based simple and robust method for generating millimeter waves applicable in 5G access fronthaul is presented. Besides generating of the mm-wave signal in the 60 GHz frequency band the radio over fiber (RoF) system for transmission of orthogonal frequency division multiplexing (OFDM) with 5 GHz bandwidth is presented. For the purpose of wireless transmission for 5G application the required antenna is designed and developed. The total system performance in one small cell was studied and the error vector magnitude (EVM) of the system was evaluated.

scholarly journals An Improved Area Efficient 16-QAM Transceiver Design using Vedic Multiplier for Wireless Applications

2019 ◽  
Vol 8 (3) ◽  
pp. 4419-4425
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Binary Sequence ◽  
Modulation Method ◽  
Wireless Applications ◽  
Transceiver Design ◽  
Multiplication Process ◽  
Vedic Multiplier ◽  
Field Programmable ◽  
Area Efficient

In this research article, an improved area efficient 16-Quadrature Amplitude Modulation (QAM) transceiver design is introduced using Vedic multiplier. The 16-QAM design is transmitted using Pseudo Random Binary Sequence (PRBS) and modulated by changeable clock frequencies. The Vedic multiplier uses Urdhva Tiryakbhyam (Vertical and Crosswise) method of multiplication to reduce the undesirable steps and generates parallel partial products. Compressor adders are used in the Vedic multipliers, which helps to increase the speed of multiplication process and reduces the carry delay. Four Compressor adders namely 5-3, 10-4, 15-4 and 20-5 are used in a 16-bit Urdhva Tiryakbhyam Vedic multiplier to add its partial products. The proposed 16-QAM design is implemented using Spartan-3 XC3S200-5 pq208 Field Programmable Gate Array (FPGA) device which occupies 672 slices, 1102 4-input Look up Tables (LUTs) and 39 mW of power consumption. The Vedic multiplier based 16-QAM transceiver design reduces 17.2% slices and 4.5% 4-input LUTs. The 16-QAM is a preferred digital modulation method in the Orthogonal Frequency Division Multiplexing (OFDM) system, which reduces bit errors and noise effects during data transmission. The OFDM transceiver design is used in the high-speed wireless communication by excellence of its Multi-carrier modulation method.

Analysis of Inter-Satellite Optical Wireless Communication System

2017 ◽  
Vol 7 (10) ◽  
pp. 10
Author(s):  
Rajbir Singh
Keyword(s):  
Wireless Communication ◽  
Optical Networks ◽  
Data Transmission ◽  
High Speed ◽  
Open Space ◽  
Communication Link ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
High Speed Data ◽  
Speed Data Transmission

Optical networks are bandwidth efficient networks are used for long haul communication providing seamless data transfer. For high speed data transmission in open space between different satellites, Inter-satellite Optical wireless communication (IsOWC) is widely used .In this paper we have evaluated the performance of IsOWC communication link for high speed data transmission .The performance of the system is evaluated on the basis of qualitative parameters such as Q-factor and BER using optisystem simulator.

One-step Separation and Purification of Four Phenolic Acids from Stenoloma chusanum (L.) Ching by Medium-pressure Liquid Chromatography and High-speed Counter-current Chromatography

2019 ◽  
Vol 9 (2) ◽  
pp. 138-143
Author(s):  
Tianyun Li ◽  
Xiling Dai ◽  
Yichen Li ◽  
Guozheng Huang ◽  
Jianguo Cao
Keyword(s):  
Natural Products ◽  
Liquid Chromatography ◽  
Phenolic Acids ◽  
High Speed ◽  
High Efficiency ◽  
Total Phenolic ◽  
Medium Pressure ◽  
Medium Pressure Liquid Chromatography ◽  
One Step ◽  
Counter Current

Background:Stenoloma chusanum (L.) Ching is a Chinese traditional medicinal fern with high total flavonoid and total phenolic content. Traditionally, phenolic compounds were separated by using column chromatography, which is relatively inefficient. </P><P> Objective: This study aims to use an efficient method to separate natural products from S. chusanum by Medium-Pressure Liquid Chromatography (MPLC) and High-Speed Counter-Current Chromatography (HSCCC).Methods:In the present research, firstly, a sample (2.5 g) from the dichloromethane extract of S. chusanum was separated by MPLC. Next, fraction P5 was purified by HSCCC with a two-phase solvent system composed of hexane-ethyl acetate-methanol-water (HEMWat) at a volume ratio of 2:4:1:4 (v/v/v/v). </P><P> Result: Four phenolic acids were obtained and their structures were identified by means of NMR and ESI-mass analysis. They were identified as: 1) protocatechuic acid (34 mg, purity 90.1%), 2) syringic acid (66 mg, purity 99.0%), 3) p-hydroxybenzoic acid (5 mg, purity 91.2%) and 4) vanillic acid (6 mg, purity 99.3%).Conclusion:The combination of MPLC and HSCCC is a high-efficiency separation method for natural products. This is the first report with regard to the separation of four phenolic acids in one step by MPLC and HSCCC from S. chusanum (L.) Ching.

Downlink data transmission for high-speed trains in 5G communication systems

2020 ◽  
Vol 14 (18) ◽  
pp. 3175-3183
Author(s):  
Vahid Vahidi ◽  
Ebrahim Saberinia
Keyword(s):  
Data Transmission ◽  
Communication Systems ◽  
High Speed ◽  
High Speed Trains ◽  
5G Communication
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