Adjustable dual-band link

A data receiving circuit, comprising:

• a first communication link circuit, including:
• a baseband circuit and at least a passband circuit, the baseband circuit corresponding to a baseband sub-channel and the passband circuit corresponding to a passband sub-channel;
• and
• a circuit that combines a first subset of a data stream having a first symbol rate from the baseband circuit and a second subset of the data stream having a second symbol rate from the passband circuit into the data stream, the first symbol rate and the second symbol rate each being substantially less than a symbol rate of the data stream,
• wherein the baseband sub-channel and the passband sub-channel are separated by an adjacent guardband of frequencies, a passband carrier frequency is adjusted to define the guardband, and the guardband corresponds to a first notch in a channel response of a first communications channel.

A data transmission circuit, comprising:

• a first communications means, including:
• a baseband mechanism and at least a passband mechanism, the baseband mechanism corresponding to a baseband sub-channel and the passband mechanism corresponding to a passband sub-channel;
• and
• a mechanism for distributing a first subset of a data stream having a first symbol rate to the baseband mechanism and a second subset of the data stream having a second symbol rate to the passband mechanism, the first symbol rate and the second symbol rate each being substantially less than a symbol rate of the data stream,
• wherein the baseband sub-channel and the passband sub-channel are separated by a guardband of frequencies, the passband mechanism is adjusted to define the guardband, and the guardband corresponds to a first notch in a channel response of a first communications channel.

A data receiving circuit, comprising:

• a first communications means, including:
• a baseband mechanism and at least a passband mechanism, the baseband mechanism corresponding to a baseband sub-channel and the passband mechanism corresponding to a passband sub-channel;
• and
• a mechanism for combining a first subset of a data stream having a first symbol rate from the baseband mechanism and a second subset of the data stream having a second symbol rate from the passband mechanism into the data stream, the first symbol rate and the second symbol rate each being substantially less than a symbol rate of the data stream,
• wherein the baseband sub-channel and the passband sub-channel are separated by a guardband of frequencies, the passband mechanism is adjusted to define the guardband, and the guardband corresponds to a first notch in a channel response of a first communications channel.

A method of transmitting data, comprising:

• receiving a data stream having a symbol rate;
• distributing a first subset of a data stream to a baseband sub-channel and a second subset of a data stream to a passband sub-channel, and
• adjusting a passband carrier frequency to define a guardband of frequencies separating the baseband sub-channel and the passband sub-channel,
• wherein the first subset of the data stream and the second subset of the data stream each have a respective symbol rate substantially less than the symbol rate of the data stream, and the guardband corresponds to a first notch in a channel response of a first communications channel.

A computer readable medium containing data representing a circuit that includes:

• a data transmission circuit, comprising:
• a first communication link circuit, including:
• a baseband circuit and at least a passband circuit, the baseband circuit corresponding to a baseband sub-channel and the passband circuit corresponding to a passband sub-channel;
• and
• a circuit that distributes a first subset of a data stream having a first symbol rate to the baseband circuit and a second subset of the data stream having a second symbol rate to the passband circuit, the first symbol rate and the second symbol rate each being substantially less than a symbol rate of the data stream,
• wherein the baseband sub-channel and the passband sub-channel are separated by an adjacent guardband of frequencies, a passband carrier frequency is adjusted to define the guardband, and the guardband corresponds to a first notch in a channel response of a first communications channel.

A computer readable medium containing data representing a circuit that includes:

• a data receiving circuit, comprising:
• a first communication link circuit, including:
• a baseband circuit and at least a passband circuit, the baseband circuit corresponding to a baseband sub-channel and the passband circuit corresponding to a passband sub-channel;
• and
• a circuit that combines a first subset of a data stream having a first symbol rate from the baseband circuit and a second subset of the data stream having a second symbol rate from the passband circuit into the data stream, the first symbol rate and the second symbol rate each being substantially less than a symbol rate of the data stream,
• wherein the baseband sub-channel and the passband sub-channel are separated by an adjacent guardband of frequencies, a passband carrier frequency is adjusted to define the guardband, and the guardband corresponds to a first notch in a channel response of a first communications channel.

A method of receiving data, comprising:

• adjusting a passband carrier frequency to define a guardband separating a baseband sub-channel and a passband sub-channel;
• and
• combining a first subset of a data stream having a first symbol rate from the baseband sub-channel and a second subset of a data stream having a second symbol rate from the passband sub-channel into a data stream, the first symbol rate and the second symbol rate each being substantially less than a symbol rate of the data stream,
• wherein the guardband of frequencies corresponds to a first notch in a channel response of a first communications channel.