Transmission device with channel equalization and control and methods for use therewith

• US 9,680,670 B2
• Filed: 11/20/2014
• Issued: 06/13/2017
• Est. Priority Date: 11/20/2014
• 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: Barzegar, Farhad, Henry, Paul Shala, Bennett, Robert, Gerszberg, Irwin, Barnickel, Donald J, Willis, III, Thomas M.
• Primary Examiner(s): PANWALKAR, VINEETA S
• Application Number:
  US14/548,429
• Publication Number:
  US 20160149731A1
• Time in Patent Office: 936 Days
• CPC Class Codes: H04B 2203/5441 Wireless systems or telephone
• CPC Class Codes: H04B 3/54 Systems for transmission via power distribution lines
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04L 25/03006 Arrangements for removing intersymbol interference
• CPC Class Codes: H04L 25/03891 Spatial equalizers MIMO diversity systems H04B7/0413
• CPC Class Codes: H04W 16/18 Network planning tools
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

Aspects of the subject disclosure may include, for example, a transmission device that includes at least one transceiver configured to modulate data to generate a plurality of first electromagnetic waves in accordance with channel control parameters. A plurality of couplers are configured to couple at least a portion of the plurality of first electromagnetic waves to a transmission medium, wherein the plurality of couplers generate a plurality of second electromagnetic waves that propagate along the outer surface of the transmission medium. A training controller is configured to generate the channel control parameters based on channel state information received from at least one remote transmission device. Other embodiments are disclosed.

Claims

1. A transmission device comprising:

at least one transceiver that facilitates modulation of data to generate a plurality of first electromagnetic waves in accordance with surface wave channel dispersion equalization parameters;

a plurality of couplers configured to couple at least a portion of the plurality of first electromagnetic waves to an outer surface of a transmission medium, wherein the plurality of couplers generates a plurality of second electromagnetic waves that propagate longitudinally along the outer surface of the transmission medium to at least one other transmission device that is remote from the transmission device, wherein the plurality of second electromagnetic waves includes a first wave having a first electromagnetic field pattern that includes a first lobe at a first azimuthal orientation to a longitudinal axis of the transmission medium and a second wave having a second electromagnetic field pattern that includes a second lobe at a second azimuthal orientation to the longitudinal axis of the transmission medium, and wherein the first azimuthal orientation differs from the second azimuthal orientation, and wherein the at least one other transmission device is configured to receive the plurality of the second electromagnetic waves from the outer surface of the transmission medium; and

a training controller that facilitates generation of the surface wave channel dispersion equalization parameters based on channel state information received from the at least one other transmission device to mitigate a channel dispersion of the plurality of second electromagnetic waves that propagate longitudinally along the outer surface of the transmission medium.

2. The transmission device of claim 1 wherein the plurality of second electromagnetic waves include at least one training field and wherein the at least one other transmission device updates the channel state information based on an analysis of the at least one training field.

3. The transmission device of claim 1 wherein the channel state information includes a channel estimate.

4. The transmission device of claim 1 wherein the channel state information includes a selection of at least one of:

a modulation type and a bit rate.

5. The transmission device of claim 1 wherein the surface wave channel dispersion equalization parameters include a plurality of phase offsets and wherein the at least one transceiver generates the plurality of first electromagnetic waves based on the plurality of phase offsets to further reduce inter-symbol interference.

6. The transmission device of claim 1 wherein the at least one transceiver operates in a selected one of a plurality of multi-input multi-output (MIMO) modes.

7. The transmission device of claim 1 wherein the at least one transceiver modulates the data to generate the plurality of first electromagnetic waves in accordance with orthogonal frequency division multiplexing.

8. A method, comprising:

generating surface wave channel dispersion equalization parameters based on channel state information;

modulating data, by at least one transceiver, to generate a plurality of first electromagnetic waves in accordance with the surface wave channel dispersion equalization parameters; and

coupling, by a plurality of couplers, at least a portion of each of the plurality of first electromagnetic waves onto an outer surface of a transmission medium to generate a plurality of second electromagnetic waves that longitudinally propagate along the outer surface of the transmission medium to at least one remote transmission device, wherein the at least one remote transmission device is configured to receive the plurality of second electromagnetic waves from the outer surface of the transmission medium, wherein the plurality of second electromagnetic waves includes a first wave having a first electromagnetic field pattern that includes a first lobe at a first azimuthal orientation to a longitudinal axis of the transmission medium and a second wave having a second electromagnetic field pattern that includes a second lobe at a second azimuthal orientation to the longitudinal axis of the transmission medium, and wherein the first azimuthal orientation differs from the second azimuthal orientation, and wherein the surface wave channel dispersion equalization parameters contribute to mitigating a channel dispersion of the plurality of second electromagnetic waves that propagate longitudinally along the outer surface of the transmission medium;

wherein the channel state information is received from the at least one remote transmission device via third electromagnetic waves that propagate longitudinally along the outer surface of the transmission medium from the at least one remote transmission device.

9. The method of claim 8 wherein the plurality of second electromagnetic waves include at least one sequence of training signals and wherein the at least one remote transmission device updates the channel state information based on an analysis of the at least one sequence of training signals.

10. The method of claim 8 wherein the channel state information includes a channel estimate.

11. The method of claim 8 wherein the channel state information includes a selection of at least one of:

a modulation type and a bit rate.

12. The method of claim 8 wherein the surface wave channel dispersion equalization parameters include a plurality of phase offsets and wherein the at least one transceiver generates the plurality of first electromagnetic waves based on the plurality of phase offsets.

13. The method of claim 8 wherein the at least one transceiver operates in a selected one of a plurality of multi-input multi-output (MIMO) modes.

14. The method of claim 8 wherein the at least one transceiver modulates the data to generate the plurality of first electromagnetic waves in accordance with orthogonal frequency division multiplexing.

15. A transmission device comprising:

at least one transceiver configured to modulate data to generate a plurality of first electromagnetic waves in accordance with channel control parameters; and

a plurality of couplers configured to couple at least a portion of the plurality of first electromagnetic waves to a transmission medium, wherein the plurality of couplers generate a plurality of second electromagnetic waves that propagate longitudinally along an outer surface of the transmission medium to communicate the data, wherein the plurality of second electromagnetic waves includes a first wave having a first electromagnetic field pattern that includes a first lobe at a first azimuthal orientation to a longitudinal axis of the transmission medium and a second wave having a second electromagnetic field pattern that includes a second lobe at a second azimuthal orientation to the longitudinal axis of the transmission medium, and wherein the first azimuthal orientation differs from the second azimuthal orientation, and wherein the channel control parameters contribute to mitigating a channel dispersion of the plurality of second electromagnetic waves that propagate longitudinally along the outer surface of the transmission medium; and

a training controller configured to generate the channel control parameters based on channel state information received via a plurality of third electromagnetic waves that propagate longitudinally along the outer surface of the transmission medium from at least one other transmission device that is remote from the transmission device, and wherein the at least one other transmission device is further configured to adapt the at least one transceiver based on the channel state information.

16. The transmission device of claim 15 wherein the second plurality of electromagnetic waves include at least one training field and wherein the at least one other transmission device generates the channel state information based on an analysis of the at least one training field.

17. The transmission device of claim 15 wherein the channel state information includes a channel estimate.

18. The transmission device of claim 15 wherein the channel control parameters include a selection of at least one of:

a modulation type and a bit rate.

19. The transmission device of claim 15 wherein the channel control parameters include a plurality of phase offsets and wherein the at least one transceiver generates the plurality of first electromagnetic waves based on the plurality of phase offsets to mitigate effects of a distortion in the plurality of second electromagnetic waves caused by the transmission medium.

20. The transmission device of claim 15 wherein the at least one transceiver modulates the data to generate the plurality of first electromagnetic waves in accordance with orthogonal frequency division multiplexing.