Impact of receiver coil misalignment on near-field communication system performance

2012 ◽  
Author(s):  
Umar Azad ◽  
Yuanxun Ethan Wang
Keyword(s):  
Communication System ◽  
System Performance ◽  
Near Field ◽  
Near Field Communication ◽  
Receiver Coil ◽  
Communication System Performance

scholarly journals An Implantable Inductive Near-Field Communication System with 64 Channels for Acquisition of Gastrointestinal Bioelectrical Activity

Sensors ◽  
2019 ◽  
Vol 19 (12) ◽  
pp. 2810 ◽  
Author(s):  
Amir Javan-Khoshkholgh ◽  
Aydin Farajidavar
Keyword(s):  
Real Time ◽  
Radio Frequency Identification ◽  
Communication System ◽  
Near Field ◽  
Data Communication ◽  
Near Field Communication ◽  
Bioelectrical Activity ◽  
Real Time Monitoring ◽  
Rf Transceiver

High-resolution (HR) mapping of the gastrointestinal (GI) bioelectrical activity is an emerging method to define the GI dysrhythmias such as gastroparesis and functional dyspepsia. Currently, there is no solution available to conduct HR mapping in long-term studies. We have developed an implantable 64-channel closed-loop near-field communication system for real-time monitoring of gastric electrical activity. The system is composed of an implantable unit (IU), a wearable unit (WU), and a stationary unit (SU) connected to a computer. Simultaneous data telemetry and power transfer between the IU and WU is carried out through a radio-frequency identification (RFID) link operating at 13.56 MHz. Data at the IU are encoded according to a self-clocking differential pulse position algorithm, and load shift keying modulated with only 6.25% duty cycle to be back scattered to the WU over the inductive path. The retrieved data at the WU are then either transmitted to the SU for real-time monitoring through an ISM-band RF transceiver or stored locally on a micro SD memory card. The measurement results demonstrated successful data communication at the rate of 125 kb/s when the distance between the IU and WU is less than 5 cm. The signals recorded in vitro at IU and received by SU were verified by a graphical user interface.

Conditions for the non-ergodicity of Markov chains with application to a communication system

1987 ◽  
Vol 24 (2) ◽  
pp. 339-346 ◽  
Author(s):  
Linn I. Sennott
Keyword(s):  
Markov Chain ◽  
Markov Chains ◽  
Communication System ◽  
System Performance ◽  
Multiple Access ◽  
Sufficient Condition ◽  
Performance Bounds ◽  
Communication System Performance ◽  
Null Recurrence ◽  
The Stability

We obtain a sufficient condition for the transience of a Markov chain, and a sufficient condition for its null recurrence. These are applied to characterize the stability of a multiple-access communication system. Performance bounds for the system are also obtained.

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