Multimode antenna system and methods for use therewith

• US 10,431,898 B2
• Filed: 04/03/2019
• Issued: 10/01/2019
• Est. Priority Date: 09/06/2017
• Status: Active Grant

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Henry, Paul Shala, Vannucci, Giovanni, Willis, III, Thomas M.
• Primary Examiner(s): Baltzell, Andrea Lindgren
• Application Number:
  US16/373,816
• Publication Number:
  US 20190229432A1
• Time in Patent Office: 181 Days
• Field of Search: 343776
• CPC Class Codes: H01Q 13/02 Waveguide horns
• CPC Class Codes: H01Q 21/0006 Particular feeding systems
• CPC Class Codes: H01Q 21/205 providing an omnidirectional coverage turnstile aerials H01Q21/26
• CPC Class Codes: H04B 1/38 Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
• CPC Class Codes: H04B 3/52 Systems for transmission between fixed stations via waveguides
• CPC Class Codes: H04B 7/0413 MIMO systems

Abstract

In accordance with one or more embodiments, a communication device includes an antenna having a feed point and an aperture. A feedline is coupled to the feed point of the dielectric antenna. A multi-input multi-output (MIMO) transceiver is coupled to feedline, the MIMO transceiver facilitating a transmission of first electromagnetic waves to the feed point of the antenna, wherein the first electromagnetic waves are guided by the feedline, wherein the first electromagnetic waves propagate along the feedline via a plurality of guided wave modes without requiring an electrical return path, wherein the first electromagnetic waves convey first data in accordance with one or more MIMO techniques and wherein the first electromagnetic waves generate first free-space wireless signals at the aperture of the antenna in accordance with the one or more MIMO techniques.

Claims

1. A communication device, comprising:

a dielectric antenna having a feed point and an aperture;

a feedline coupled to the feed point of the dielectric antenna; and

a multi-input multi-output (MIMO) transceiver, coupled to the feedline, the MIMO transceiver configured to transmit first electromagnetic waves along the feedline to the feed point of the dielectric antenna, wherein the first electromagnetic waves propagate along the feedline via a plurality of guided wave modes at non-optical frequencies without requiring an electrical return path, wherein the first electromagnetic waves convey first data in accordance with one or more MIMO techniques and wherein the first electromagnetic waves generate first free-space wireless signals at the aperture of the dielectric antenna in accordance with the one or more MIMO techniques.

2. The communication device of claim 1, wherein the first electromagnetic waves are received by the dielectric antenna at the feed point, and the first electromagnetic waves propagate through a body of the dielectric antenna to the aperture.

3. The communication device of claim 2, wherein the body of the dielectric antenna supports propagation of the plurality of guided wave modes from the feed point to the aperture.

4. The communication device of claim 1, wherein the MIMO transceiver includes a plurality of couplers configured to launch the first electromagnetic waves on the feedline.

5. The communication device of claim 4, wherein the MIMO transceiver further includes a plurality of radio frequency front ends, coupled to the plurality of couplers, configured to generate first electromagnetic signals to facilitate launching of the first electromagnetic waves on the feedline via the plurality of couplers.

6. The communication device of claim 5, wherein the MIMO transceiver further includes a MIMO processor configured to select the one or more MIMO techniques and controls the plurality of radio frequency front ends to generate the first electromagnetic signals in accordance with the one or more MIMO techniques.

7. The communication device of claim 6, wherein the plurality of couplers is further configured to receive second electromagnetic waves from the feedline, wherein the second electromagnetic waves are launched on the feedline in response to second free space wireless signals received at the aperture of the dielectric antenna, wherein the plurality of radio frequency front ends receives second electromagnetic signals in response to the second electromagnetic waves, wherein the second free space wireless signals convey second data from a remote device that receives the first free-space wireless signals, and wherein the MIMO transceiver extracts the second data based on the second electromagnetic signals and in accordance with the one or more MIMO techniques.

8. The communication device of claim 7, wherein the MIMO processor is configured to generate baseband signals conveying third data based on channel state feedback included in the second data, wherein the baseband signals are generated in accordance with the one or more MIMO techniques, wherein the plurality of radio frequency front ends is configured to generate third electromagnetic signals based on the baseband signals, wherein the plurality of couplers is configured to launch third electromagnetic waves on the feedline based on the third electromagnetic signals and wherein the third electromagnetic waves generate third free-space wireless signals at the aperture of the dielectric antenna in accordance with the one or more MIMO techniques.

9. The communication device of claim 6, wherein the MIMO processor selects the one or more MIMO techniques from a plurality of MIMO techniques.

10. The communication device of claim 9, wherein the plurality MIMO techniques includes:

a precoding, a spatial multiplexing, a mode division multiplexing, or a diversity coding or a combination thereof.

11. The communication device of claim 1, wherein the feedline is a hollow conductive waveguide.

12. The communication device of claim 1, wherein the feedline is a conductorless dielectric cable.

13. A method, comprising:

transmitting first electromagnetic waves along a feedline to a feed point of a dielectric antenna, wherein the first electromagnetic waves propagate at non-optical frequencies along the feedline via a plurality of guided wave modes without requiring an electrical return path, wherein the first electromagnetic waves convey first data in accordance with one or more multi-input multi-output (MIMO) techniques; and

generating first free-space wireless signals at an aperture of the dielectric antenna in response to the first electromagnetic waves.

14. The method of claim 13, further comprising:

launching second electromagnetic waves on the feedline in response to second free space wireless signals received at the aperture of the dielectric antenna, wherein the second free space wireless signals convey second data from a remote device that receives the first free-space wireless signals;

receiving the second electromagnetic waves from the feedline;

generating first electromagnetic signals in response to the second electromagnetic waves; and

extracting the second data based on the second electromagnetic signals and in accordance with the one or more MIMO techniques.

15. The method of claim 14, further comprising:

generating baseband signals conveying third data based on channel state feedback included in the second data, wherein the baseband signals are generated in accordance with the one or more MIMO techniques;

generating second electromagnetic signals based on the baseband signals;

launching third electromagnetic waves on the feedline based on the third electromagnetic signals; and

generating third free-space wireless signals at the aperture of the dielectric antenna based on the third electromagnetic waves.

16. The method of claim 13, further comprising:

selecting the one or more MIMO techniques from a plurality of MIMO techniques.

17. The method of claim 14, wherein the one or more MIMO techniques include:

a precoding, a spatial multiplexing, a mode division multiplexing, or a diversity coding or a combination thereof.

18. The method of claim 13, wherein the feedline is one of:

a hollow conductive waveguide or a conductorless dielectric cable.

19. The method of claim 13, wherein the dielectric antenna supports propagation of the plurality of guided wave modes from the feed point to the aperture.

20. A communication device, comprising:

means for transmitting electromagnetic waves along a feedline to a feed point of a dielectric antenna, wherein the electromagnetic waves are at non-optical frequencies, wherein the electromagnetic waves propagate along the feedline via a corresponding plurality of guided wave modes without requiring an electrical return path, wherein the electromagnetic waves convey data in accordance with one or more multi-input multi-output (MIMO) techniques; and

means for radiating free-space wireless signals in response to the electromagnetic waves.