Wireless communication structures and methods with enhanced range and performance

• US 7,035,652 B1
• Filed: 01/23/2004
• Issued: 04/25/2006
• Est. Priority Date: 02/11/2003
• Status: Active Grant

• Current Assignee: Callahan Cellular LLC (Intellectual Ventures LLC)
• Original Assignee: CalAmp Corporation
• Inventors: Kelkar, Kris
• Primary Examiner(s): Corsaro, Nick
• Assistant Examiner(s): STEPHEN, EMEM O
• Application Number:
  US10/764,077
• Time in Patent Office: 823 Days
• Field of Search: 455/63.4, 455/65, 455504-506, 455/562.1, 455/456.1
• US Class Current: 455/456.6
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

Wireless communication structures and methods are provided that enhance range and performance via managed access to a wireless communication medium between system clients. The access is configured to maintain the low equipment costs and widespread equipment availability of standards-based communication systems. In particular, the structures include at least one antenna, a processor that spatially processes receive signals from the antenna, a media access controller that compares the age of receive location information with a predetermined time coherence, a location-information transformer that transforms the receive location information into transmit location information, and a transmit spatial processor configured to provide a transmit signal to the antenna that is spatially processed in accordance with the transmit location information if the age is less than the time coherence and spatially processed in accordance with predetermined location information if the age exceeds the time coherence. A database is preferably provided for storage of the receive location information and the age.

Claims

1. A wireless communication device for communications with clients in a communication network, the device comprising:

at least one antenna;

a receive processor that processes receive signals from said antenna and provides corresponding receive location information;

a media access controller that receives signals from said receive processor and provides output signals for transmission;

a location-information transformer that transforms said receive location information into transmit location information; and

a transmit processor that provides transmit signals to said antenna in response to at least one of said output signals and said transmit location information;

wherein said media access controller compares the age of said receive location information with a predetermined time coherence and said transmit processor is configured to provide a transmit signal to said antenna that is;

spatially processed in accordance with said transmit location information if said age is less than said time coherence; and

spatially processed in accordance with predetermined location information if said age exceeds said time coherence.

2. The communication device of claim 1, wherein said media access controller is configured to establish said time coherence from at least one of a predetermined value and a default value updated with observed changes of said receive location information.

3. The communication device of claim 1, further including a database for storage of said receive location information and said age.

4. The communication device of claim 1, wherein said media access controller is configured to direct spatial processing of said receive processor and said transmit processor.

5. The communication device of claim 1, further including a modem that demodulates signals from said receive processor and modulates said output signals.

6. A wireless communication device for communications with clients in a communication network, the device comprising:

at least one antenna;

a receive processor that processes receive signals from said antenna and provides corresponding receive location information;

a media access controller that receives signals from said receive processor and provides output signals for transmission;

a location-information transformer that transforms said receive location information into transmit location information; and

a transmit processor that provides transmit signals to said antenna in response to at least one of said output signals and said transmit location information;

wherein said media access controller is configured to;

command said transmit processor to spatially process an output signal carrying a channel reservation request in accordance with predetermined location information that corresponds to all of said clients; and

command said receive processor to spatially process a receive signal to enhance receipt of a clear channel acknowledgment from one of said clients and to provide corresponding receive location information to said location-information transformer.

7. The communication device of claim 6, wherein said media access controller is configured to subsequently command said transmit processor to spatially process a data-carrying output signal in accordance with transmit location information from said location-information transformer.

8. The communication device of claim 7, wherein said media access controller is configured to:

send a first data fragment of said data-carrying signal along with said channel reservation request; and

send remaining data fragments of said data-carrying signal in said output signal.

9. A wireless communication device for communications with clients in a communication network, the device comprising:

at least one antenna;

a receive processor that processes receive signals from said antenna and provides corresponding receive location information;

a media access controller that receives signals from said receive processor and provides output signals for transmission;

a location-information transformer that transforms said receive location information into transmit location information; and

a transmit processor that provides transmit signals to said antenna in response to at least one of said output signals and said transmit location information;

wherein said media access controller is configured to;

command said receive processor to spatially process a receive signal to enhance receipt of a channel reservation request from one of said clients and to provide corresponding receive location information to said location-information transformer; and

command said transmit processor to spatially process an output signal carrying a clear channel acknowledgment wherein said process is in accordance with predetermined location information that corresponds to all of said clients.

10. The communication device of claim 9, wherein said media access controller is configured to subsequently command said receive processor to spatially process a data-carrying receive signal in accordance with transmit location information from said location-information transformer.

11. A wireless communication device for communications with clients in a communication network, the device comprising:

at least one antenna;

a receive processor that processes receive signals from said antenna and provides corresponding receive location information;

a media access controller that receives signals from said receive processor and provides output signals for transmission;

a location-information transformer that transforms said receive location information into transmit location information; and

a transmit processor that provides transmit signals to said antenna in response to at least one of said output signals and said transmit location information;

further including a plurality of modems for demodulating said receive signal and modulating said transmit signal and wherein said media access controller is configured to;

command said receive processor to spatially process first and second receive signals to enhance receipt of channel reservation requests from first and second ones of said clients and to provide corresponding receive location information to said location-information transformer; and

command said transmit processor to spatially process first and second output signals carrying clear channel acknowledgments wherein said process is in accordance with said transmit location information.

12. The communication device of claim 11, wherein said media access controller is configured to subsequently command said receive processor to process first and second receive signals to enhance receipt of data from said first and second clients.

13. The communication device of claim 12, wherein said media access controller is configured to measure and store receive and transmit signal propagation delays associated with at least one of said clients.

14. A wireless communication device for communications with clients in a communication network, the device comprising:

at least one antenna;

a receive processor that processes receive signals from said antenna and provides corresponding receive location information;

a media access controller that receives signals from said receive processor and provides output signals for transmission;

a location-information transformer that transforms said receive location information into transmit location information; and

a transmit processor that provides transmit signals to said antenna in response to at least one of said output signals and said transmit location information;

wherein said media access controller is configured to measure and store receive and transmit signal propagation delays associated with at least one of said clients; and

wherein said media access controller compares the age of said receive location information with a predetermined time coherence and is configured to adjust said age to accommodate said propagation delays.

15. The communication device of claim 14, wherein said media access controller is configured to advance said transmit signals to accommodate said propagation delays.

16. The communication device of claim 14, wherein said media access controller is configured to extend reservation times for said receive and transmit signals associated with a respective one of said clients.

17. The communication device of claim 14, wherein said transmit location information is in the form of at least one of a selected antenna, a selected beam generated by said antenna, a phase/amplitude signal, and a set of complex coefficients.

18. The communication device of claim 14, wherein said receive processor, said media access controller, said location-information transformer and said transmit processor are realized with at least one of a gate array and an appropriately-programmed digital processor.

19. A method for communicating with clients in a communication network, the method comprising the steps of:

processing receive signals obtained from at least one antenna to thereby provide input signals and corresponding receive location information;

in response to said input signals, providing output signals for transmission;

transforming said receive location information to transmit location information; and

providing transmit signals to said antenna in response to at least one of said output signals and said transmit location information;

further including the steps of;

comparing the age of said receive location information with a predetermined time coherence;

spatially processing said output signals in accordance with said transmit location information if said age is less than said time coherence; and

spatially processing said output signals in accordance with predetermined location information if said age exceeds said time coherence.

20. The method of claim 19, further including the step of establishing said time coherence from at least one of a predetermined value and a default value updated with observed changes of said receive location information.

21. The method of claim 19, further including the step of storing said receive location information and said age.

22. The method of claim 19, wherein said receive signals are spatially processed and said output signals are spatially processed.

23. The method of claim 19, further including the step of demodulating said input signals and modulating said output signals.

24. A method for communicating with clients in a communication network, the method comprising the steps of:

processing receive signals obtained from at least one antenna to thereby provide input signals and corresponding receive location information;

in response to said input signals, providing output signals for transmission;

transforming said receive location information to transmit location information; and

providing transmit signals to said antenna in response to at least one of said output signals and said transmit location information;

wherein;

said providing step includes the step of spatially processing an output signal carrying a channel reservation request in accordance with predetermined location information that corresponds to all of said clients; and

said processing step includes the steps of spatially processing a receive signal to enhance receipt of a clear channel acknowledgment from one of said clients and providing corresponding receive location information.

25. The method of claim 24, wherein said providing step further includes the step of subsequently spatially processing a data-carrying output signal in accordance with said transmit location information.

26. The method of claim 25, wherein said providing step further includes the steps of:

sending a first data fragment of said data-carrying signal along with said channel reservation request; and

sending remaining data fragments of said data-carrying signal in said spatially processing step.

27. A method for communicating with clients in a communication network, the method comprising the steps of:

processing receive signals obtained from at least one antenna to thereby provide input signals and corresponding receive location information;

in response to said input signals, providing output signals for transmission;

transforming said receive location information to transmit location information; and

providing transmit signals to said antenna in response to at least one of said output signals and said transmit location information;

wherein;

said processing step includes the steps of spatially processing a receive signal to enhance receipt of a channel reservation request from one of said clients and providing corresponding receive location information; and

said providing step includes the step of spatially processing an output signal carrying a clear channel acknowledgment wherein said process is in accordance with predetermined location information that corresponds to all of said clients.

28. The method of claim 27, wherein said processing step further includes the step of spatially processing a data-carrying receive signal in accordance with said transmit location information.

29. A method for communicating with clients in a communication network, the method comprising the steps of:

processing receive signals obtained from at least one antenna to thereby provide input signals and corresponding receive location information;

in response to said input signals, providing output signals for transmission;

transforming said receive location information to transmit location information; and

providing transmit signals to said antenna in response to at least one of said output signals and said transmit location information;

further including the steps of;

independently demodulating a plurality of said input signals;

independently modulating a plurality of said transmit signals;

and wherein;

said processing step includes the steps of spatially processing first and second receive signals to enhance receipt of channel reservation requests from first and second ones of said clients and providing corresponding receive location information; and

said providing step includes the step of spatially processing first and second output signals carrying clear channel acknowledgments wherein said process is in accordance with said transmit location information.

30. The method of claim 29, further including the step of processing first and second receive signals to enhance receipt of data from said first and second clients.

31. The method of claim 30, further including the steps of measuring and storing receive and transmit signal propagation delays associated with at least one of said clients.

32. A method for communicating with clients in a communication network, the method comprising the steps of:

processing receive signals obtained from at least one antenna to thereby provide input signals and corresponding receive location information;

in response to said input signals providing output signals for transmission;

transforming said receive location information to transmit location information; and

providing transmit signals to said antenna in response to at least one of said output signals and said transmit location information;

further including the steps of measuring and storing receive and transmit signal propagation delays associated with at least one of said clients;

and further including the steps of;

comparing the age of said receive location information with a predetermined time coherence; and

adjusting said age to accommodate said propagation delays.

33. The method of claim 32, further including the step of advancing said transmit signals to accommodate said propagation delays.

34. The method of claim 32, further including the step of extending reservation times for said receive and transmit signals associated with a respective one of said clients.

35. The method of claim 32, further including the step of storing said transmit location information in the form of at least one of a selected antenna, a selected beam generated by said antenna, a phase/amplitude signal, and a set of complex coefficients.