Diversity reception for aeronautical packet data communications systems

• US 6,477,359 B2
• Filed: 05/04/2001
• Issued: 11/05/2002
• Est. Priority Date: 05/05/2000
• Status: Expired due to Fees

• Current Assignee: Heppe, Stephen B., Nair K. Prasad, Steven Friedman
• Original Assignee: Heppe, Stephen B., Nair K. Prasad, Steven Friedman
• Inventors: Friedman, Steven, Heppe, Stephen B., Nair, K. Prasad
• Primary Examiner(s): Kizou, Hassan
• Assistant Examiner(s): HOANG, THAI D
• Application Number:
  US09/848,619
• Publication Number:
  US 20020003790A1
• Time in Patent Office: 550 Days
• Field of Search: 370/389, 370/390-393, 370/427, 370/328, 370/332, 370/334, 370/312, 455/101, 455/133-135, 455/277.1, 375/347
• US Class Current: 455/135
• CPC Class Codes: H04B 7/0802 using antenna selection H04B7/0868 takes precedence; antenna beam directivity switching H01Q3/24
• CPC Class Codes: H04B 7/18506 Communications with or from aircraft, i.e. aeronautical mobile service
• CPC Class Codes: H04W 84/06 Airborne or Satellite Networks space-based or airborne stations H04B7/185

Abstract

This invention is an application of antenna diversity and two or more multi-channel radios, with a novel cooperative sharing strategy among the multi-channel radios, to aeronautical packet data communications and other communications. It offers the following benefits: enhanced data communications performance in a fading environment; enhanced data communications performance at long range; enhanced data communications performance in the presence of cochannel interference; extendable to an arbitrary number of cooperating peer radios; no single point of failure; no increase in pilot workload or change in operational procedures.

Claims

1. A system for packet data communications for data-oriented applications, the system comprising:

a plurality of radios, each of the plurality of radios supporting at least one packet-oriented data protocol common to all of the plurality of radios, and each of the plurality of radios comprising a receiver;

a plurality of antennas in one-to-one communication with the plurality of radios for the packet data communications; and

interwiring means for interconnecting the plurality of radios, wherein;

each of the plurality of radios further comprises a data arbitrator, in communication with the data arbitrators of the others of the plurality of radios through the interwiring means, for requesting shadow reception service for said data-oriented applications from the other radios, controlling the radio associated with that data arbitrator to provide the shadow reception service in response to requests received from the other radios if the radio can provide the shadow reception service with the resources available, and arbitrating among possible multiple copies of a received packet data message associated with one of the data-oriented applications, said possible multiple copies received by the radio'"'"'s receiver or by the interwiring means from the other radios, so that only a first copy of said possible multiple copies is further processed and subsequent copies of said possible multiple copies are not further processed.

2. The system of claim 1, wherein the plurality of radios implement a common priority scheme for the requests for shadow reception service, thereby allowing each of the radios to determine a most preferred set of shadow reception service requests.

3. The system of claim 1, wherein each of the radios further comprises a transmitter, and wherein the data arbitrators delegate transmit responsibility among the plurality of radios.

4. The system of claim 1, wherein, when a first one of the radios transmits a self-addressed message, and when a second one of the radios receives the self-addressed message, the second one of the radios transmits the self-addressed message over the interwiring means to the first one of the radios, providing shadow reception service to enable over-the-air loop-back testing.

5. The system of claim 1, wherein each of the plurality of radios comprises a radio LRU for aeronautical packet data communications.

6. The system of claim 5, wherein the plurality of radio LRUs implement a common priority scheme for the requests for shadow reception service, thereby allowing each of the radio LRUs to determine a most preferred set of shadow reception service requests.

7. The system of claim 5, wherein each of the radio LRUs further comprises a transmitter, and wherein the data arbitrators delegate transmit responsibility among the plurality of radio LRUs.

8. The system of claim 5, wherein, when a first one of the radio LRUs transmits a self-addressed message, and when a second one of the radio LRUs receives the self-addressed message, the second one of the radio LRUs transmits the self-addressed message over the interwiring means to the first one of the radio LRUs, providing shadow reception service to enable over-the-air loop-back testing.

9. The system of claim 1, wherein each of the plurality of radios comprises a radio LRU for packet data communications as well as other communications.

10. The system of claim 9, wherein the plurality of radio LRUs implement a common priority scheme for the requests for shadow reception service, thereby allowing each of the radio LRUs to determine a most preferred set of shadow reception service requests.

11. The system of claim 9, wherein each of the radio LRUs further comprises a transmitter, and wherein the data arbitrators delegate transmit responsibility among the plurality of radio LRUs.

12. The system of claim 9, wherein, when a first one of the radio LRUs transmits a self-addressed message, and when a second one of the radio LRUs receives the self-addressed message, the second one of the radio LRUs transmits the self-addressed message over the interwiring means to the first one of the radio LRUs, providing shadow reception service to enable over-the-air loop-back testing.

13. A system for aeronautical communications, the system comprising:

a plurality of radio LRUs;

a plurality of antennas in one-to-one communication with the plurality of radio LRUs; and

interwiring means for interconnecting the plurality of radio LRUs, wherein;

the plurality of radio LRUs are individually configured to request shadow reception service from other ones of the radio LRUs and to provide the shadow reception service in response to requests received from the other ones of the radio LRUs if said shadow reception service can be provided with resources available, said shadow reception service comprising RF, downcoverted RF or a soft-decision demodulator output signal stream.

14. The system of claim 13, wherein the plurality of radio LRUs implement a common priority scheme for the requests for shadow reception service, thereby allowing each of the radio LRUs to determine a most preferred set of shadow reception service requests.

15. The system of claim 13, wherein each of the radio LRUs further comprises a transmitter, and wherein the data arbitrators delegate transmit responsibility among the plurality of radio LRUs.

16. The system of claim 13, wherein, when a first one of the radio LRUs transmits a self-addressed message, and when a second one of the radio LRUs receives the self-addressed message, the second one of the radio LRUs transmits the self-addressed message over the interwiring means to the first one of the radio LRUs, providing shadow reception service to enable over-the-air loop-back testing.