scholarly journals Underground Communications Using Capacitive Data Transfer Devices

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Shaoge Zang ◽  
Keran Hou ◽  
Sing Kiong Nguang
Keyword(s):  
Electrical Properties ◽  
Frequency Shift ◽  
Data Transmission ◽  
Data Transfer ◽  
Transmission Range ◽  
Generalized Model ◽  
Shift Keying ◽  
Frequency Variations ◽  
Underground Communications ◽  
Operation Frequency

This paper explores the feasibility of applying the capacitive power transfer (CPT) technology in underground data transmission applications. Based on the electrical properties of soils, the paper extends the existing CPT air coupler model into a more generalized model. The autonomous push-pull inverter is selected to power the CPT system and modified to further the data transmission range. With a designed load shift keying (LSK) circuitry, this self-oscillating inverter regards the data as a sequence of impedance changes, resulting in operation frequency drifts. A Frequency Shift Keying (FSK) demodulator is applied to capture the frequency variations and recover back to data. The proposed design has been simulated, verified, and implemented on a complete prototype. Various testings have been carried out, and the results are satisfactory.

scholarly journals Underwater Data Transmission Using Frequency Shift Keying (FSK) Modulation with Bit Rate of 2400 bps

2020 ◽  
Vol 18 (1) ◽  
pp. 17
Author(s):  
Slamet Indriyanto ◽  
Anggun Fitrian Isnawati ◽  
Jans Hendry ◽  
Ian Yosef Matheus Edward
Keyword(s):  
Frequency Shift ◽  
Data Transmission ◽  
Bit Rate ◽  
Frequency Shift Keying ◽  
Shift Keying

Hardware challenges with an anticoagulation strategy guided by detection of atrial fibrillation by an implantable loop recorder

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
S Mittal ◽  
D Brenner ◽  
S Oliveros ◽  
A Bhatt ◽  
M Preminger ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Data Transmission ◽  
Data Transfer ◽  
Implantable Loop Recorder ◽  
Loop Recorder ◽  
Bedside Monitor ◽  
Pill In The Pocket ◽  
Fundamental Requirement ◽  
Ecg Data ◽  
Clinical Strategy

Abstract Background A “pill-in-the-pocket” anticoagulation strategy, guided by ECG data from an implantable loop recorder (ILR), has been advocated as a clinical strategy. However, a fundamental requirement is the ability to reliably obtain daily ECG data from patients. Objective To determine the reliability of daily ECG data transfer from ILRs. Methods We evaluated patients implanted with an ILR in whom we sought to withhold oral anticoagulation (OAC) unless atrial fibrillation (AF) was detected. The ILR transmits data nightly to a bedside monitor. Once received, the data are sent to a central server. Over the course of a month, we tracked for each patient whether ECG data were received by the server. Results The study included 170 AF patients with an ILR where we planned to withhold OAC unless AF was documented. Daily ECG data were automatically transmitted and retrievable in only 36 (21%) patients. Two (1%) pts had not a single day of connectivity, 6 (4%) pts were connected <7 days, and 16 (9%) pts were connected <14 days. Wireless connectivity was lost for >48 hours in 89 (52%) patients (Figure). Most patients experienced multiple reasons for data transmission failure within the month. Conclusions To determine whether an ILR guided OAC strategy is feasible, reliable daily transmission of ECG data is a fundamental prerequisite. Current technology facilitated daily ECG data transfer in only 1/5 of patients. In the remaining, there was either extended loss of connectivity or no connectivity at all. A “pill-in-the-pocket” anticoagulation approach is currently difficult given existing hardware limitations. Funding Acknowledgement Type of funding source: None

Study on FSK Signal Demodulation Based on Chirp-Z Transform

2012 ◽  
Vol 532-533 ◽  
pp. 827-831
Author(s):  
Jiang Hua Xia ◽  
Jing Guo ◽  
Xiao Ming Wang
Keyword(s):  
Frequency Shift ◽  
Matlab Simulation ◽  
A Algorithm ◽  
Signal Parameters ◽  
Detailed Explanation ◽  
Symbol Rate ◽  
Shift Keying ◽  
Signal Demodulation ◽  
Track Circuits ◽  
Strong Ability

The Frequency-Shift Keying (FSK) signal is frequently used in track circuits because of the strong ability of resistance interference. Symbol rate is one of the important signal parameters for safety of railway. The paper propose a algorithm of high precise detectation of FSK signal using Chirp-Z transform; Theoretically gives the detailed explanation to the major technique, and has carried on the Matlab simulation, The simulation result indicates this method during the enhancement is shifted signal examination precision, reduced the computation order of complexity.

A Simple Modulator for Sinusoidal Frequency Shift Keying

1982 ◽  
Vol 30 (5) ◽  
pp. 1048-1051 ◽  
Author(s):  
R. LaRosa ◽  
T. Marynowski ◽  
K. Henrich
Keyword(s):  
Frequency Shift ◽  
Frequency Shift Keying ◽  
Shift Keying
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