# US 2017/0288917 A1 · Transmission device with channel equalization and control and methods for use therewith > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0288917 A1 - Document ID: US20170288917A1 - Status: Published application - Kind: A1 - Application number: 15/623,453 - Filed: 2017-06-15 - Published: 2017-10-05 - Earliest claimed: 2014-11-20 - Assignees: AT&T Intellectual Property I, L.P. - Applicants: At&T Intellectual Property I, L.P. - Inventors: Paul Shala HENRY; Robert BENNETT; Irwin GERSZBERG; Farhad BARZEGAR; Donald J. BARNICKEL; Thomas M. WILLIS, III - Web page: https://patentgrep.com/patent/US20170288917A1 ## CPC - H04L 25/03891: {Spatial equalizers (MIMO diversity systems H04B7/0413)} - H04B 3/54: Systems for transmission via power distribution lines - H04B 7/0413: MIMO systems - H04L 25/03006: {Arrangements for removing intersymbol interference} - H04W 16/18: Network planning tools - H04W 72/20: Control channels or signalling for resource management - H04B 2203/5441: Wireless systems or telephone - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## 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 ### Claim 1 A transmission device comprising: a plurality of couplers configured to receive a plurality of first electromagnetic waves generated in accordance with surface wave channel dispersion equalization parameters and to couple at least a portion of the plurality of first electromagnetic waves to an outer surface of a transmission medium as a plurality of second electromagnetic 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. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 1) The transmission device of claim 1 wherein the channel state information includes a channel estimate. ### Claim 4 (depends on 1) 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. ### Claim 5 (depends on 1) 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. ### Claim 6 (depends on 1) The transmission device of claim 1 wherein at least one transceiver modulates the data to generate the plurality of first electromagnetic waves in accordance with orthogonal frequency division multiplexing. ### Claim 7 (depends on 6) The transmission device of claim 6 wherein the at least one transceiver operates in a selected one of a plurality of multi-input multi-output (MIMO) modes. ### Claim 8 A method, comprising: receiving 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. ### Claim 9 (depends on 8) 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. ### Claim 10 (depends on 8) The method of claim 8 wherein the channel state information includes a channel estimate. ### Claim 11 (depends on 8) 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. ### Claim 12 (depends on 8) 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. ### Claim 13 (depends on 8) The method of claim 8 wherein at least one transceiver modulates the data to generate the plurality of first electromagnetic waves in accordance with orthogonal frequency division multiplexing. ### Claim 14 (depends on 13) The method of claim 13 wherein the at least one transceiver operates in a selected one of a plurality of multi-input multi-output (MIMO) modes. ### Claim 15 A transmission device comprising: at least one transceiver configured 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 as 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. ### Claim 16 (depends on 15) 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. ### Claim 17 (depends on 15) The transmission device of claim 15 wherein the channel state information includes a channel estimate. ### Claim 18 (depends on 15) 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. ### Claim 19 (depends on 15) 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. ### Claim 20 (depends on 15) The transmission device of claim 15 wherein the at least one transceiver modulates data to generate the plurality of first electromagnetic waves in accordance with orthogonal frequency division multiplexing.