System and method for transmitting/receiving telemetry control signals with if payload data on common cable between indoor and outdoor units

• US 20030152140A1
• Filed: 01/08/2003
• Published: 08/14/2003
• Est. Priority Date: 01/10/2002
• Status: Abandoned Application

• Current Assignee: Reveal Imaging, LLC
• Original Assignee: Xxtrans Incorporated
• Inventors: Antoniak, Michael
• Application Number:
  US10/338,818
• Publication Number:
  US 20030152140A1
• Time in Patent Office: Days
• US Class Current: 375/219
• CPC Class Codes: G08C 15/12 the signals being represented by pulse characteristics in transmission link
• CPC Class Codes: H04B 1/50 using different frequencies for the two directions of communication
• CPC Class Codes: H04L 5/06 the signals being represented by different frequencies combined with time-division multiplexing H04L5/26

Abstract

A method and system transmits telemetry control signals with IF payload data from a common cable between an indoor unit and an outdoor unit. The system modulates a carrier signal with telemetry control signals to represent serial data bytes by switching ON and OFF a carrier tone for ON_OFF keying and bandpass filtering such that when transmitted on a common cable, the signal will not interfere with payload data and DC signals.

Claims

1. A method of transmitting/receiving telemetry control signals with Intermediate Frequency (IF) payload data and DC signals on a common cable between an indoor unit (IDU) and outdoor unit (ODU) comprising the steps of:

modulating a carrier signal with the telemetry control signals to represent serial data bytes by switching ON and OFF a carrier tone for ON_OFF keying and forming a modulated signal; and

bandpass filtering the modulated signal such that when transmitted on a common cable, the signal will not interfere with payload data and DC signals.

2. A method according to claim 1, and further comprising the step of multiplexing the modulated signal with payload data and DC signals onto the common cable.

3. A method according to claim 1, and further comprising the step of receiving and demodulating the modulated signal by detecting the carrier tone and converting the carrier tone into a logic-level signal that is decoded.

4. A method according to claim 1, and further comprising the step of receiving and demodulating the modulated signal using a bandpass filter and envelope detector and inverter logic gate.

5. A method according to claim 4, and further comprising the step of demodulating with a bandpass filter that feeds a diode envelope detector followed by an inverter having an output that is passed to a universal asynchronous receiver/transmitter (UART).

6. A method according to claim 1, and further comprising the step of communicating full-duplex by assigning one of the ODU or IDU to transmit on a lower frequency and the other to transmit on a higher frequency.

7. A method according to claim 1, and further comprising the step of communicating half-duplex by designating master or slave devices for respective ODU or IDU.

8. A method according to claim 1, and further comprising the step of bandpass filtering and removing DC components and reducing high frequency harmonics that would interfere with other signals at multiplexing.

9. A method of transmitting/receiving telemetry control signals with Intermediate Frequency (IF) payload data and DC signals on a common cable between an indoor unit (IDU) and outdoor unit (ODU) comprising the steps of:

modulating a carrier signal with the telemetry control signals to represent serial data bytes by switching ON and OFF a carrier tone for ON_OFF keying and forming a modulated signal by combining the output of a universal asynchronous receiver/transmitter (UART) with a clock signal from a clock source at a desired carrier frequency; and

bandpass filtering the modulated signal such that when transmitted on a common cable, the signal will not interfere with payload data and DC signals.

10. A method according to claim 9, and further comprising the step of combining the output of the UART with the clock signal using AND gate logic as a mixer that switches ON and OFF the carrier.

11. A method according to claim 9, and further comprising the step of bandpass filtering and removing DC components and reducing high frequency harmonics that would interfere with other signals at multiplexing.

12. A method according to claim 9, and further comprising the step of multiplexing the modulated signal with payload data and DC signals onto the common cable.

13. A method according to claim 9, and further comprising the step of receiving the and detecting the carrier tone and converting the into a logic-level signal that is decoded.

14. A method according to claim 9, and further comprising the step of demodulating the modulated signal using a bandpass filter and envelope detector and inverter logic gate.

15. A method according to claim 14, and further comprising the step of demodulating with a bandpass filter that feeds a diode envelope detector followed by an inverter having an output that is passed to a universal asynchronous receiver/transmitter.

16. A method according to claim 9, and further comprising the step of communicating full-duplex by assigning one of the ODU or IDU to transmit on a lower frequency and the other to transmit on a higher frequency.

17. A method according to claim 9, and further comprising the step of communicating half-duplex by designating master or slave devices for respective ODU or IDU.

18. A system of transmitting/receiving telemetry control signals with Intermediate Frequency (IF) payload data and DC signals on a common cable between an indoor unit (IDU) and outdoor unit (ODU) comprising:

a modulator for modulating a carrier signal with the telemetry control signals to represent serial data bytes by switching ON and OFF a carrier tone for ON_OFF keying and forming a modulated signal; and

a bandpass filter for bandpass filtering the modulated signal such that when transmitted on a common cable, the signal will not interfere with payload data and DC signals.

19. A system according to claim 18, and further comprising a multiplexer for multiplexing the modulated signal with payload data and DC signals onto the common cable.

20. A system according to claim 18, and further comprising a receiver that receives the modulated signal and a demodulator that demodulates the modulated signal by detecting the carrier tone and converting the carrier tone into a logic-level signal that is decoded.

21. A system according to claim 18, and further comprising a receiver for receiving the signal and a demodulator for demodulating the modulated signal, said demodulator comprising a bandpass filter and envelope detector and inverter logic gate.

22. A system according to claim 21, and further comprising a diode envelope detector that receives a signal from the bandpass filter, followed by an inverter and a universal asynchronous receiver/transmitter that receives the signal from the diode envelope detector.

23. A system of transmitting/receiving telemetry control signals with Intermediate Frequency (IF) payload data and DC signals on a common cable between an indoor unit (IDU) and outdoor unit (ODU) comprising:

a modulator for modulating a carrier signal with the telemetry control signals to represent serial data bytes by switching ON and OFF a carrier tone for ON_OFF keying and forming a modulated signal, said modulator comprising a universal asynchronous receiver/transmitter (UART) and clock source with a clock signal such that the output of the UART is combined with the clock signal at a desired carrier frequency; and

a bandpass filter for bandpass filtering the modulated signal such that when transmitted on a common cable, the signal will not interfere with payload data and DC signals.

24. A system according to claim 23, and further comprising an AND gate logic circuit that combines the output of the UART with the clock signal as a mixer that switches ON and OFF the carrier.

25. A system according to claim 23, and further comprising a multiplexer for multiplexing the modulated signal with payload data and DC signals onto the common cable.

26. A system according to claim 23, and further comprising a receiver for receiving the modulated signal and a demodulator that detects the carrier tone and converts the signal into a logic-level signal that is decoded.

27. A system according to claim 23, and further comprising a receiver for receiving the modulated signal and a bandpass filter and envelope detector and inverter logic gate for demodulating the modulated signal.

28. A system according to claim 27, and further comprising a bandpass filter and a diode envelope detector. an inverter, and a UART that receives the signal.