Communications system having multiple spread carriers and associated methods
AssigneeHarris Global Communications, Inc.
InventorsJames A. Norris, Christopher D. Mackey, Richard J. Buckley, Myung K. Lee, Shane B. Eisenman
Life of this patent
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Abstract
A communications system may include a transmitter having spreading stages configured to spread a common modulated baseband input data stream based upon respective coefficient sequences; a plurality of upconverters, each having a different frequency; and an RF output stage that generates an RF output signal. A receiver may include an RF input stage that receives an RF input signal, a plurality of downconverters, a plurality of despreading stages, and a demodulator coupled to the despreading stages.
Claims17
A communications system comprising:
- a transmitter comprising
- a modulator configured to receive input data and copy the input data into a plurality of common modulated baseband input data streams, each having the same input data,
- a plurality of spreading stages configured to spread the common modulated baseband input data streams based upon respective coefficient sequences,
- a plurality of upconverters, each upconverter coupled to a respective spreading stage, and each upconverter having a different frequency, and
- an RF output stage coupled to the plurality of upconverters to generate an RF output signal, wherein the RF output stage comprises a plurality of digital-to-analog converters (DACs) coupled to the plurality of upconverters, a combiner coupled to the plurality of DACs, and another upconverter coupled to the combiner;
- and
- a receiver comprising
- an RF input stage configured to receive an RF input signal,
- a plurality of downconverters coupled to the RF input stage,
- a plurality of despreading stages, each despreading stage coupled to a respective downconverter, and
- a demodulator coupled to the plurality of despreading stages.
A transmitter comprising:
- a modulator configured to receive input data and copy the input data and output a plurality of common modulated baseband input data streams, each having the same input data;
- a plurality of spreading stages configured to spread the common modulated baseband input data streams based upon respective coefficient sequences;
- a plurality of upconverters, each upconverter coupled to a respective spreading stage, and each upconverter having a different frequency;
- and
- an RF output stage coupled to the plurality of upconverters to generate an RF output signal, wherein the RF output stage comprises a plurality of digital-to-analog converters (DACs) coupled to the plurality of upconverters, a combiner coupled to the plurality of DACs, and another upconverter coupled to the combiner.
A method of operating a transmitter comprising:
- copying within a modulator input data into a plurality of common modulated baseband input data streams each having the same input data;
- spreading with a plurality of spreading stages the common modulated baseband input data streams based upon respective coefficient sequences;
- upconverting the baseband input data streams with a plurality of upconverters, each upconverter coupled to a respective spreading stage, and each upconverter having a different frequency;
- converting the upconverted baseband input data streams by a plurality of digital-to-analog converters;
- and
- generating an RF output signal with an RF output stage coupled to the plurality of digital-to-analog converters by combining multiple RF carriers within a combiner coupled to the plurality of digital-to-analog converters and upconverting the combined multiple RF carriers within an upconverter coupled to the combiner.
Dependencies are inferred from the claim text.