System and method for asynchronous multi-stream transmission for NOMA
AssigneeHughes Network Systems, LLC
InventorsMustafa Eroz, Lin-Nan Lee
Life of this patent
Estimating the term…
Abstract
Methods and apparatus for increasing spectral efficiency in non-orthogonal multiple access (NOMA) communication, that implement receiving a signal stream from a user, splitting the signal stream into a plurality of sub-streams, applying a forward error coding (FEC) to each one of the sub-streams, and outputting a corresponding plurality of FEC encoded sub-streams. This can include modulating a corresponding carrier with each of the FEC encoded sub-streams, and combining and transmitting the corresponding plurality of modulated carrier signals. The modulated carrier signals can each carry a respective one of the FEC encoded sub-streams.
Claims20
A system for increasing spectral efficiency comprising:
- a 1:N signal stream splitter, configured to receive a signal stream, and split the signal stream into N sub-streams, N being an integer greater than one;
- N of forward error encoding (FEC)-scramblers configured to receive the N sub-streams and output a corresponding N scrambled FEC encoded sub-streams, wherein each of the N FEC-scramblers includes a corresponding FEC unit and a corresponding one of N scramblers, and wherein, in each of the N FEC-scramblers,
- an FEC encoder is configured to receive a corresponding one of the N sub-streams, apply an FEC process to the sub-stream, and generate a corresponding FEC encoded sub-stream, to form N FEC encoded sub-streams, and
- a scrambler is configured to receive the generated FEC encoded sub-stream and output a corresponding scrambled FEC encoded sub-stream, to form N scrambled FEC encoded sub-streams;
- N modulator devices, each configured to receive a corresponding one of the N scrambled FEC encoded sub-streams and to modulate a carrier signal with the scrambled FEC encoded sub-stream, and generate a corresponding modulated carrier signal, to form N modulated carrier signals, each carrying a corresponding one of the scrambled FEC encoded sub-streams;
- and
- a combiner/transmitter device, configured to combine and transmit the N modulated carrier signals.
A method for increasing spectral efficiency in transmitting a user signal stream from a terminal, the method comprising:
- receiving in the terminal a user signal stream from a user;
- splitting the signal stream into N sub-streams;
- applying a forward error coding (FEC) to each of the N sub-streams, and outputting a corresponding FEC encoded sub-stream, forming N FEC encoded sub-streams;
- applying N scrambling processes, each to a corresponding one of the N FEC encoded sub-streams, and each outputting a corresponding terminal scrambled FEC encoded sub-stream, forming N terminal scrambled FEC encoded sub-streams;
- modulating a carrier signal with each of the N terminal scrambled FEC encoded sub-streams, and outputting a corresponding N modulated carrier signals, each carrying a corresponding one of the N terminal scrambled FEC encoded sub-streams;
- and
- combining and transmitting the corresponding N modulated carrier signals, each of the N transmitted modulated carrier signals carrying a respective one of the N terminal scrambled FEC encoded sub-streams.
A computer readable medium on which are stored computer instructions and data that, when executed by a computer, collectively cause the computer to perform, in a terminal, the method of:
- receiving in the terminal a user signal stream from a user;
- splitting the user signal stream into N sub-streams;
- applying a forward error coding (FEC) to each e-Fie of the N sub-streams, and outputting a corresponding FEC encoded sub-stream, forming N FEC encoded sub-streams;
- applying N scrambling processes, each to a corresponding one of the N FEC encoded sub-streams to output a corresponding terminal scrambled FEC encoded sub-stream, forming N terminal scrambled FEC encoded sub-streams;
- modulating a carrier with each of the N terminal scrambled FEC encoded sub-streams, forming a corresponding N modulated carrier signals, each carrying a corresponding one of the N terminal scrambled FEC encoded sub-streams;
- and
- combining and causing a transmitter to transmit the corresponding N modulated carrier signals, each of the N transmitted modulated carrier signals carrying a respective one of the N terminal scrambled FEC encoded sub-streams.
Dependencies are inferred from the claim text.