Digital iterative gain control

• US 20040022334A1
• Filed: 07/30/2003
• Published: 02/05/2004
• Est. Priority Date: 08/01/2002
• Status: Active Grant

• Current Assignee: Inncom Intl Inc (Honeywell International Inc.)
• Original Assignee: Inncom Intl Inc (Honeywell International Inc.)
• Inventors: Roosli, Philipp, Shah, Hazrat, Giffone, Ralph
• Granted Patent: US 7,822,349 B2
• Time in Patent Office: Days
• US Class Current: 375/345
• CPC Class Codes: H03G 3/3084 in receivers or transmitters for electromagnetic waves other than radiowaves, e.g. lightwaves H03G3/32, H03G3/34 take precedence
• CPC Class Codes: H04B 10/114 Indoor or close-range type systems

Abstract

In an IR communication network, a method is described to optimize channel performance in the presence of strong and varying IR interference. The method controls of the channel gain based on quantitative measurement of the channel noise.

Claims

1. A wireless communication system comprising a transmitter and a receiver;

the receiver having a digitally controllable gain;

the gain being iteratively adjusted until a preset level of noise is received in a unit of time when there is no data transmission.

2. The communication system of claim 1, where the communication channel uses IR.

3. The communication system of claim 1, where the noise is primarily shot noise.

4. The communication system of claim 1. where the preset level of noise is a number of noise pulses per second.

5. The communication system of claim 1. where adjustment of the gain is inked to an external event.

6. The communication system of claim 1, where the receiver separates noise from data based on the validity of the decoded data packets.

7. The communication system of claim 3, where the sampling period for noise pulses is longer than the length of a data packet.

8. The communication system of claim 1, where the gain of the receiver is attenuated to measure a margin of signal that is available.

9. A wireless communication system comprising a transmitter and a receiver;

the receiver having a digitally controllable gain;

the gain being adjusted in response to a predetermined external event.

10. The communication system of claim 9, where the communication channel uses IR.

11. The communication system of claim 9, where the noise is primarily shot noise.

12. The communication system of claim 9, where the gain is iteratively adjusted until a preset level of noise is received in a predetermined unit of time.

13. The communication system of claim 12, where the preset level of noise is a number of noise pulses per second.

14. The communication system of claim 12, where the receiver separates noise from data based on the validity of the decoded data packets.

15. The communication system of claim 12, where the sampling period for noise pulses is longer than the length of a data packet.

16. The communication system of claim 12, where the gain of the receiver is attenuated to measure a margin of signal that is available.