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US 2021/0168003 A1Published application
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
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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.
Claims32
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.
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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.
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A receiver comprising:
- an RF input stage configured to receive a multicarrier RF input signal;
- a splitter coupled to the RF input stage and configured to split the multicarrier RF input signal into “n” RF input signals;
- a plurality of analog-to-digital converters coupled to the splitter and configured to sample out sub-bands as carriers corresponding to transmitted sub-bands of the multicarrier RF input signal;
- a plurality of downconverters coupled to the plurality of analog-to-digital converters;
- a plurality of despreading stages, each despreading stage coupled to a respective downconverter;
- and
- a demodulator coupled to the plurality of despreading stages to perform a demodulation and time alignment upstream of the demodulation.
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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;
- generating an RF output signal with an RF output stage coupled to the plurality of digital-to-analog converters by combining multiple RF carriers.
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A method of operating a receiver comprising:
- receiving a multicarrier RF input signal with an RF input stage;
- splitting the multicarrier RF input signal into “n” RF input signals;
- sampling out carrier sub-bands corresponding to transmitted sub-bands of the multicarrier RF input signal with a plurality of analog-to-digital converters coupled to the splitter;
- downconverting the input with a plurality of downconverters coupled to the plurality of analog-to-digital converters;
- despreading the input signal with despreading stages, each despreading stage coupled to a respective downconverter;
- and
- demodulating the input signal with a demodulator coupled to the plurality of despreading stages by performing a demodulation and time alignment upstream of the demodulation.
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Dependencies are inferred from the claim text.