Non-orthogonal multiple access
AssigneeGenghiscomm Holdings, LLC
InventorSteve Shattil
Life of this patent
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Abstract
Systems, methods, and apparatuses for analyzing and synthesizing wireless communication signals are provided. A receiver might transform a received signal into a basis in which the transformed signal is sparse, which can reduce the complexity of joint detection by facilitating message passing algorithm (MPA) decoding. A transmitter might employ dense codewords in a first basis, which may facilitate certain signal-processing operations and may provide a transmission with a low peak-to-average-power ratio. The codewords can be designed to be sparse when transformed to a second basis. The codewords may be configured for non-orthogonal multiple access.
Claims21
A method of communication by a wireless device configured for communicating in a wireless network, comprising:
- selecting at least one direct-sequence code corresponding to a layer or a data symbol;
- and
- modulating a block of pulse waveforms with the at least one direct-sequence code to produce a discrete-time signal;
- wherein the at least one direct-sequence code provides the discrete-time signal with a frequency-domain sparsity pattern configured for non-orthogonal multiple access (NOMA).
An apparatus for wireless communication, comprising:
- a non-transitory computer-readable memory;
- and at least one processor coupled to the non-transitory computer-readable memory and configured for:
- selecting at least one direct-sequence code corresponding to a layer or a data symbol;
- and
- modulating a block of pulse waveforms with the at least one direct-sequence code to produce a discrete-time signal;
- wherein the at least one direct-sequence code provides the discrete-time signal with a frequency-domain sparsity pattern configured for non-orthogonal multiple access (NOMA).
An apparatus for wireless communication, comprising:
- a direct-sequence controller for selecting at least one direct-sequence code corresponding to a layer or a data symbol;
- a pulse-shaping filter for generating a block of circular-shifted pulse waveforms;
- and
- a modulator for modulating the block with the at least one direct-sequence code to produce a discrete-time signal;
- wherein the at least one direct-sequence code provides the discrete-time signal with a frequency-domain sparsity pattern configured for non-orthogonal multiple access (NOMA).
Dependencies are inferred from the claim text.