Quadrature modulation without carrier
AssigneeUltrabit Communications LLC
InventorStephan V. Schell
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Abstract
Transmitters, receivers and associated methods are disclosed for providing phase and amplitude modulation in a carrier-less communication system (e.g., an ultra-wide band communication system). An approximate quadrature signal is provided by delaying the in-phase signal by an amount determined by various criteria, such as the bandwidths of the component signals, minimizing the mean square error between an approximate quadrature signal and the true quadrature signal, and minimizing the auto-correlation function of the in-phase signal.
Claims10
A method, comprising:
- obtaining, by a transmitter, an in-phase signal;
- obtaining, by the transmitter, an approximation of a quadrature signal by applying a delay to the in-phase signal, wherein a value of the delay is selected by reducing a magnitude of an auto-correlation function of the in-phase signal;
- and
- summing, by the transmitter, the in-phase signal and the approximation of the quadrature signal.
An apparatus, comprising:
- a first signal path configured to generate an in-phase signal;
- a second signal path configured to generate an approximation of a quadrature signal by application of a delay to the in-phase signal, wherein the second signal path is configured to select a value of the delay that reduces a magnitude of an auto-correlation function of the in-phase signal;
- and
- a summer coupled to the first and second signal paths and configured to sum the in-phase signal and the approximation of the quadrature signal.
An apparatus comprising a transmitter configured to obtain an in-phase signal;
- obtain an approximation of a quadrature signal by applying a delay to the in-phase signal, wherein a value of the delay is selected by reducing a magnitude of an auto-correlation function of the in-phase signal;
- and
- sum the in-phase signal and the approximation of the quadrature signal.
Dependencies are inferred from the claim text.