Wireless communication systems, interrogators and methods of communication within a wireless communication system

• US 8,351,968 B2
• Filed: 02/19/2002
• Issued: 01/08/2013
• Est. Priority Date: 03/09/1999
• Status: Expired due to Fees

• Current Assignee: Round Rock Research LLC
• Original Assignee: Round Rock Research LLC
• Inventors: Ovard, David K., Greeff, Roy
• Primary Examiner(s): Le, Lana N
• Application Number:
  US10/081,256
• Publication Number:
  US 20020090958A1
• Time in Patent Office: 3,976 Days
• Field of Search: 455/456.1, 455/410, 455/458, 455/41.1, 455/41.3, 455/517, 4552321-2341, 455/73, 340/573.4, 340/989, 340/10.1, 340/10.2, 340/825.49
• US Class Current: 455/517
• CPC Class Codes: G06K 17/0022 arrangements or provisions for transferring data to distant stations, e.g. from a sensing device "transfer between computer elements G06F13/00 "; data-transmission H04L
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G06K 7/01 Details
• CPC Class Codes: G06K 7/10356 using a plurality of antennas, e.g. configurations including means to resolve interference between the plurality of antennas
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

The present invention relates to wireless communication systems, interrogators and methods of communicating within a wireless communication system. One aspect of the present invention provides a wireless communication system including at least one remote communication device configured to communicate a return link wireless signal; an interrogator including: a communication station configured to receive the return link wireless signal and to generate a return link communication signal corresponding to the return link wireless signal; communication circuitry coupled with the communication station and configured to communicate the return link communication signal; and a housing remotely located with respect to the communication station and including circuitry configured to receive the return link communication signal from the communication circuitry and to process the return link communication signal.

Claims

1. A wireless communication system comprising:

at least one remote communication device configured to communicate a return link wireless signal responsive to a forward link wireless signal; and

an interrogator including;

a communication station configured to output the forward link wireless signal, to receive the return link wireless signal outputted from the remote communication device and to generate a return link communication signal corresponding to the return link wireless signal;

communication circuitry coupled with the communication station and configured to communicate the return link communication signal, said communication circuitry comprising a plurality of wireless transceivers that collectively comprise a plurality of communication paths and a plurality of associated communication ranges; and

a housing remotely located with respect to the communication station and including circuitry configured to receive the return link communication signal from the communication circuitry and to process the return link communication signal;

wherein the communication circuitry is controlled by a controller that can switch between communications paths after all return link communications have been received within a respective communications path.

2. The wireless communication system according to claim 1 wherein the communication station includes a low noise amplifier configured to increase the power of the return link communication signal.

3. The wireless communication system according to claim 1 wherein the housing includes adjustment circuitry configured to receive the return link communication signal from the communication circuitry and to adjust an electrical characteristic of the return link communication signal.

4. The wireless communication system according to claim 3 wherein the adjustment circuitry is configured to output the return link communication signal at a substantially constant level.

5. The wireless communication system according to claim 1 wherein the adjustment circuitry includes automatic gain control circuitry.

6. The wireless communication system according to claim 5 wherein the automatic gain control circuitry is configured to monitor the power of the return link communication signal and to adjust the power if the return link communication signal responsive to the monitoring.

7. The wireless communication system according to claim 1 wherein the communication circuitry includes a coaxial RF cable.

8. The wireless communication system according to claim 1 wherein the plurality of wireless transceivers are individually coupled with one of the housing and the communication station.

9. The wireless communication system according to claim 1 wherein the remote communication device comprises a radio frequency identification device.

10. The wireless communication system according to claim 1 wherein the at least one remote communication device is configured to receive the forward link wireless signal and to communicate the return link wireless signal responsive to receiving the forward link wireless signal.

11. The wireless communication system according to claim 1 wherein the at least one remote communication device and the interrogator are configured to implement radio frequency identification device (RFID) communications.

12. The wireless communication system according to claim 1 wherein the communication station is configured to generate the return link communication signal comprising data received within the return link wireless signal.

13. The wireless communication system according to claim 1 wherein the housing is configured to house the circuitry configured to receive the return link communication signal and to process the return link communication signal.

14. The wireless communication system according to claim 1 wherein the housing is configured to house the circuitry configured to receive the return link communication signal and to process the return link communication signal separately from circuitry of the communication station.

15. The wireless communication system according to claim 1 wherein the communication station comprises a circuit device remotely located from the housing.

16. The wireless communication system according to claim 1 wherein the communication station and housing comprise respective different circuit devices.

17. The wireless communication system according to claim 1 wherein the communication circuitry is configured to communicate the return link communication signal comprising a wireless signal.

18. The wireless communication system according to claim 1 wherein the communication circuitry is configured to communicate the return link communication signal comprising a wireless signal having a frequency outside of a frequency band of the wireless communications of the forward link wireless signal and the return link wireless signal.

19. The wireless communication system according to claim 1 wherein the communication station and housing are located in different geographical locations.

20. The wireless communication system according to claim 1 wherein the interrogator comprises a plurality of the communication stations configured to communicate with respective remote communication devices located in different geographical locations.

21. An interrogator of a wireless communication system comprising:

a plurality of communication stations positioned in different locations and individually configured to output a forward link wireless signal, to receive a return link wireless signal responsive to the outputting, and to generate a return link communication signal corresponding to the return link wireless signal;

communication circuits individually coupled with the communication stations and configured to communicate respective ones of the return link communication signals; and

a housing remotely located with respect to the communication stations and including circuitry configured to receive the return link communication signals from the communication circuits and to process the return link communication signals;

wherein the communication circuits are controlled by a controller that can switch between a plurality of communication paths after return link communication signals have been received within a respective communications path.

22. The interrogator according to claim 21 wherein the communication stations individually include a low noise amplifier configured to increase the power of the return link communication signals.

23. The interrogator according to claim 21 wherein the housing includes adjustment circuitry configured to receive the return link communication signals from the communication circuits and to adjust an electrical characteristic of the return link communication signals.

24. The interrogator according to claim 23 wherein the adjustment circuitry is configured to output the return link communication signals at a substantially constant level.

25. The interrogator according to claim 23 wherein the adjustment circuitry includes automatic gain control circuitry.

26. The interrogator according to claim 25 wherein the automatic gain control circuitry is configured to monitor the power of the return link communication signals and to adjust the power of the return link communication signals responsive to the monitoring.

27. The interrogator according to claim 21 wherein the communication circuitry includes a coaxial RF cable.

28. The interrogator according to claim 21 wherein the communication circuitry includes a plurality of wireless transceivers individually coupled with one of the housing and the communication station.

29. The interrogator according to claim 21 wherein the communication stations are individually configured to generate the return link communication signal comprising data received within the return link wireless signal.

30. An interrogator of a wireless communication system comprising:

a plurality of communication stations individually configured to output forward link wireless signals, to receive return link wireless signals responsive to the outputting and to generate return link communication signals corresponding to the return link wireless signals;

a plurality of communication circuits individually coupled with the communication stations and configured to communicate respective ones of the return link communication signals; and

a housing remotely located with respect to at least one of the communication stations and including circuitry configured to receive the return link communication signals from the communication stations and to process the return link communication signals;

wherein the plurality of communication circuits are controlled by a controller that can switch between the plurality of communication stations after return link communication signals have been received within a respective communications path.

31. The interrogator according to claim 30 wherein the housing includes adjustment circuitry configured to adjust at least one electrical characteristic of the return link communication signals.

32. The interrogator according to claim 31 wherein the adjustment circuitry includes automatic gain control circuitry.

33. The interrogator according to claim 30 further comprising a plurality of communication circuits configured to communicate the return link communication signals intermediate respective communication stations and the housing.

34. The interrogator according to claim 30 wherein the communication stations are individually positioned to receive return link wireless signals within one of a plurality of communication ranges.

35. The interrogator according to claim 30 wherein the communication stations are configured to generate the return link communication signals comprising data received within respective ones of the return link wireless signals.

36. A method of communicating within a wireless communication system comprising:

providing an interrogator having a housing and a plurality of communication stations remotely located from the housing;

communicating forward link wireless signals using the communication stations of the interrogator;

receiving return link wireless signals within the respective communication stations of the interrogator responsive to the communicating the respective forward link wireless signals;

generating return link communication signals within the communication stations corresponding to the return link wireless signals;

communicating the return link communication signals from the communication stations using respective communication circuits; and

receiving the return link communication signals within the housing from the communication circuits;

wherein the act of communicating forward link wireless signals using the communication stations further comprises switching between the communication stations after all return link wireless signals have been received in response to a communicated forward link wireless signal.

37. The method according to claim 36 further comprising amplifying the return link communication signals before communicating the return link communication signals.

38. The method according to claim 36 further comprising adjusting at least one characteristic of the return link communication signals after receiving the return link communication signals.

39. The method according to claim 38 wherein the adjusting provides return link communication signals having a substantially constant level.

40. The method according to claim 38 wherein the adjusting comprises adjusting using automatic gain control circuitry.

41. The method according to claim 36 wherein the communication stations individually receive return link wireless signals within one of a plurality of communication ranges.

42. The method according to claim 36 further comprising processing the return link communication signals after the receiving the return link communication signals.

43. The method according to claim 36 wherein the generating comprises generating the return link communication signals to comprise data received within respective ones of the return link wireless signals.