Simple correlator and integrator for an ultra-wideband (UWB) receiver
AssigneeTexas Instruments Incorporated
InventorsAnuj Batra, Anand G. Dabak, Ranjit Gharpurey
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Abstract
System and method for maximizing a signal strength of a received signal pulse. A preferred embodiment comprises a self-adjusting correlator/integrator (for example, correlator/integrator 325) that uses no historical timing information. The self-adjusting correlator/integrator uses a plurality of simple correlators/integrators (for example, correlator/integrator 805) which are configured to process a received signal at various times surrounding the signal pulse's expected arrival. A comparator (for example, comparator 820) selects an output of the simple correlators/integrators with greatest magnitude.
Claims24
A correlator/integrator comprising:
- a signal input;
- a first signal path coupled to the signal input, wherein the first signal path is controlled by a first switch, the first signal path to conduct a first signal from the signal input;
- a second signal path coupled to the signal input, wherein the second signal path is controlled by a second switch, the second signal path to conduct a second signal from the signal input;
- a capacitor coupled to the first and second signal paths, the capacitor to accumulate a charge when either signal is conducted to the capacitor;
- and
- wherein the first signal and the second signals have opposite polarity.
A method for received signal strength maximization comprising:
- setting a first correlator/integrator to start operation at a first time, wherein the first correlator/integrator produces an output dependent upon a timing match between the first time and a received signal;
- setting a second correlator/integrator to start operation at a second time, wherein the second correlator/integrator produces an output dependent upon a timing match between the second time and the received signal;
- setting a third correlator/integrator to start operation at a third time, wherein the third correlator/integrator produces an output dependent upon a timing match between the third time and the received signal;
- comparing an output from each of the first, second, and third correlators/integrators;
- and
- selecting a largest output.
A self-adjusting pulse detector comprising:
- a signal input to provide a signal;
- a plurality of correlators/integrators coupled to the signal input, each correlator/integrator containing circuitry to correlate a signal from the signal input with a desired signal and to create a value based on the correlation, wherein each correlator/integrator is configured to commence operation at a different time;
- and
- a comparator having a plurality of inputs, with each input coupled to an output from each of the plurality of correlators/integrators, the comparator to select a maximum output from the plurality of inputs.
An ultra-wideband (UWB) receiver comprising:
- a signal input;
- a filter and amplifier unit (FAU) coupled to the signal input, the FAU containing circuitry to eliminate interferers and amplify a signal provided by the signal input to an specified magnitude;
- a self-adjusting pulse detector coupled to the FAU, the self-adjusting correlator/integrator containing circuitry to maximize a signal strength of an output provided by the FAU;
- and
- a baseband processor coupled to the self-adjusting correlator/integrator, the baseband processor containing circuitry to equalize and decode a data stream provided by the self-adjusting correlator/integrator.
Dependencies are inferred from the claim text.