Receiver for body channel communication and a method of operating a receiver therefrom

• US 9,425,905 B2
• Filed: 09/09/2013
• Issued: 08/23/2016
• Est. Priority Date: 09/07/2012
• Status: Expired due to Fees

• Current Assignee: Agency For Science Technology and Research
• Original Assignee: Agency For Science Technology and Research
• Inventors: Lee, Jung Hyup, Kulkarni, Vishal Vinayak, Wang, Tao, Zhou, Jun, Liu, Xin, Je, Minkyu
• Primary Examiner(s): AKINYEMI, AJIBOLA A
• Application Number:
  US14/022,122
• Publication Number:
  US 20140080430A1
• Time in Patent Office: 1,079 Days
• Field of Search: 455/91
• US Class Current: 1/1
• CPC Class Codes: H04B 13/005 Transmission systems in which the medium consists of the human body

Abstract

In various embodiments of the present disclosure, there is provided a receiver for body channel communication. The receiver includes an electrode configured to receive an incoming signal transmitted as a multi-level transmission signal from a transmitter through a body channel, a differentiator configured to obtain a time derivative of the incoming signal indicating a plurality of data transitions, and an analog to digital converter configured to generate a multi-level output signal representing the multi-level transmission signal based on the plurality of data transitions. A corresponding method of controlling a receiver for body channel communications is provided.

Claims

1. A receiver for body channel communication comprising:

an electrode configured to receive an incoming signal transmitted as a multi-level transmission signal from a transmitter through a body channel;

a differentiator configured to obtain a time derivative of the incoming signal; and

an analog to digital converter configured to generate a multi-level representation signal representing the multi-level transmission signal based on the time derivative, wherein the analog to digital converter is a multi-level detector configured to generate a plurality of digital words by comparing each of the plurality of data transitions to a plurality of thresholds in generating the multi-level representation signal.

2. The receiver according to claim 1, further comprising an integrator configured to integrate the time derivative of the incoming signal.

3. The receiver according to claim 2, wherein the integrator is configured to integrate the time derivative of the incoming signal with respect to a clock signal operating at a predetermined duty cycle.

4. The receiver according to claim 3, further comprising a clock recovery circuit configured to determine the clock signal.

5. The receiver according to claim 4, wherein the clock recovery circuit is configured to generate a clock signal based on the incoming signal.

6. The receiver according to claim 5, the clock recovery circuit further comprising an injection-locked oscillator configured to receive the time derivative of the incoming signal and to generate the clock signal therefrom.

7. The receiver according to claim 6, further comprising a feedback loop wherein the multi-level representation signal is provided to a correlator for a phase selection correlation to be provided to the phase selector.

8. The receiver according to claim 1, further comprising a variable resistor coupled to the electrode, the variable resistor configured to adjust the impedance of the receiver with respect to the body channel.

9. The receiver according to claim 8, wherein the variable resistor is configured to adjust the impedance of the receiver to configure the characteristics of the body channel to represent a band pass filter.

10. A method of controlling a receiver for body channel communication, comprising:

receiving an incoming signal transmitted as a multi-level transmission signal from a transmitter through a body channel;

obtaining a time derivative of the incoming signal; and

generating a multi-level representation signal representing the multi-level transmission signal based on the time derivative,

wherein the method further comprises generating a plurality of digital words by comparing each of the plurality of data transitions to a plurality of thresholds in generating the multi-level representation signal.

11. The method according to claim 10, further comprising integrating the time derivative with respect to a clock signal.

12. The method according to claim 11, further comprising integrating the time derivative with respect to the clock signal operating at a predetermined duty cycle.

13. The method according to claim 11, wherein generating the clock signal based on the incoming signal comprises receiving the time derivative of the incoming signal and generating the clock signal therefrom.

14. The method according to claim 13, wherein generating the clock signal further comprises carrying out a phase selection correlation based on the multi-level representation signal in a feedback loop and selecting a phase division based on the phase selection correlation.

15. The method according to claim 10, further comprising generating a clock signal based on the incoming signal.

16. The method according to claim 10, further comprising adjusting the impedance of the receiver with respect to the body channel.

17. The method according to claim 16, wherein said adjusting the impedance of the receiver comprises adjusting the impedance of the receiver to configure the characteristics of the body channel to represent a band pass filter.

18. A system for body channel communication comprising:

a transmitter comprising;

a driver configured to generate a multi-level transmission signal comprising at least three signal levels; and

a transmission electrode configured to transmit the multi-level transmission signal through a body channel, and

a receiver comprising;

an electrode configured to receive the multi-level transmission signal from the transmitter through the body channel;

a differentiator configured to obtain a time derivative of the multi-level transmission signal; and

an analog to digital converter configured to generate a multi-level representation signal representing the multi-level transmission signal based on the time derivative, wherein the analog to digital converter is a multi-level detector configured to generate a plurality of digital words by comparing each of the plurality of data transitions to a plurality of thresholds in generating the multi-level representation signal.