Programmable, frequency agile direct conversion digital receiver with high speed oversampling
AssigneeRFDirect Corp.
InventorRonald M. Hickling
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Abstract
The invention described herein is directed to different embodiments of a wireless communications device that can be used in many different applications, such as but not limited to a digital oversampling receiver adapted to select desired signals and to reject undesired signals. In one embodiment, a wireless communications device is disclosed that comprises an architecture for a receiver front end that obviates the need for high order passive circuitry or RC active circuitry to select desired signals and to reject undesired signals.
Claims18
A wireless transmission receiver comprising:
- an N stage ring counter programmed with a count pattern, wherein N is an integer of value greater than one;
- the N stage ring counter for producing an N-cycle digital waveform;
- a combiner for combining said N-cycle digital waveform with a wireless transmission;
- predictive coders for oversampling said combined digital waveform and said wireless transmission to form a high speed serial stream, said high speed serial stream comprised of a signal of interest and a quantization noise signal;
- a suppressor for suppressing said quantization noise signal;
- a converter for converting said high speed data stream into a lower speed;
- a clock coupled to said N stage ring counter;
- an N path switching network;
- at least one predictive coder, wherein a respective one of said at least one predictive coder is coupled to a respective switch of said N path switching network;
- and
- at least two (M) digital filters, each configured to receive an output signals from all of said at least two predictive coders, wherein the outputs of each of the at least two digital filters, each represent one phase state of a phase-shift keyed wireless transmission with M possible phase states.
A method of receiving a wireless transmission comprising the steps of:
- programming a count pattern into an N stage ring counter, wherein N is an integer of value greater than one;
- producing an N-cycle digital waveform;
- combining said N-cycle digital waveform with said wireless transmission;
- oversampling said combined digital waveform and said wireless transmission to form a high speed serial stream, said high speed serial stream comprised of a signal of interest and a quantization noise signal;
- suppressing said quantization noise signal;
- converting said high speed data stream into a lower speed;
- clocking said N stage ring counter with a clock coupled to the counter;
- wherein combining includes using an N path switching network;
- receiving an output from a respective switch of said N path switching network at a respective predictive coder of at least one predictive coder;
- and
- receiving output signals from all of said at least two predictive coders at each of least two (M) digital filters, wherein the outputs of each of the at least two digital filters, each represent one phase state of a phase-shift keyed wireless transmission with M possible phase states.
A wireless transmission receiver comprising:
- an N stage ring counter programmed with a count pattern, wherein N is an integer of value greater than one;
- the N stage ring counter ?? for producing an N-cycle digital waveform;
- a combiner for combining said N-cycle digital waveform with a wireless transmission;
- predictive coders ?? for oversampling said combined digital waveform and said wireless transmission to form a high speed serial stream, said high speed serial stream comprised of a signal of interest and a quantization noise signal;
- a suppressor for suppressing said quantization noise signal;
- and
- a converter/divider for converting said high speed data stream into a lower speed.
Dependencies are inferred from the claim text.