Claims for Patent: 10,097,388

Summary for Patent: 10,097,388

Title:	Methods, devices and systems for receiving and decoding a signal in the presence of noise using slices and warping
Abstract:	A method may include receiving a signal. The signal may encode a data packet. The method may include further sampling the signal to generate sampled values, and generating a slice record comprising a plurality of slices from the sampled values by correlating the sampled values with first and second reference templates. The first reference template may include a first reference function, and the second reference template may include a second reference function in quadrature with the first reference function. The method may further include cross-correlating the slice record with a stored template to generate cross-correlation terms, and determining when a magnitude of the cross-correlation terms exceeds a predetermined threshold for a width of the stored template.
Inventor(s):	Fleming; Robert (Nicasio, CA), Kushner; Cherie (Nicasio, CA), McAllister; William H. (Saratoga, CA), Zdeblick; Mark (Portola Valley, CA)
Assignee:	PROTEUS DIGITAL HEALTH, INC. (Redwood City, CA)
Application Number:	15/678,349
Patent Claims:	1. A method, comprising: receiving a signal, the signal encoding a data packet; sampling the signal to generate sampled values; generating a slice record comprising a plurality of slices from the sampled values by correlating the sampled values with first and second reference templates, the first reference template comprising a first reference function and the second reference template comprising a second reference function in quadrature with the first reference function; cross-correlating the slice record with a stored template to generate cross-correlation terms; and determining when a magnitude of the cross-correlation terms exceeds a predetermined threshold for a width of the stored template. 2. The method of claim 1, wherein the predetermined threshold is a predetermined noise threshold. 3. The method of claim 1, wherein the stored template comprises a slice record of a preamble of the data packet. 4. The method of claim 1, wherein the first reference function comprises a cosine function and wherein the second reference function comprises a sine function. 5. The method of claim 1, further comprising determining a carrier frequency of the received signal. 6. The method of claim 1, wherein determining comprises: warping at least some of the plurality of slices by a frequency offset, and generating a filter from the warped slices. 7. The method of claim 6, further comprising determining whether the carrier frequency is within a pass-band of the generated filter. 8. The method of claim 6, wherein warping and generating comprise shifting a center frequency of the generated filter without re-acquiring or re-sampling the signal. 9. The method of claim 1, further comprising discarding the sampled values of the received signal after generating the slice record. 10. A method, comprising: receiving a signal; sampling the signal to generate sampled values; correlating the sampled values with predetermined first and second templates of values obtained at a first frequency to generate a plurality of slices at the first frequency; transforming at least some of the generated plurality of slices at the first frequency to slices at a second frequency that is different from the first frequency; generating a first filter from the slices at the second frequency; transforming at least some of the generated plurality of slices at the first frequency to slices at a third frequency that is different from the first and second frequencies, and generating a second filter from the slices at the third frequency. 11. The method of claim 10, wherein transforming and generating are carried out from the generated plurality of slices, without re-acquiring or re-sampling the signal. 12. The method of claim 10, further comprising discarding the generated sampled values of the received signal after generating the plurality of slices at the first frequency. 13. The method of claim 10, further comprising detecting a first carrier frequency within a pass-band of the first filter and detecting a second carrier frequency within a pass-band of the second filter. 14. A method, comprising: receiving a signal, the signal encoding a data packet at a first frequency; quantizing the received signal to generate sampled values that are above or below a predetermined noise threshold; correlating the sampled values with first and second templates of values obtained at a second frequency that is different from the first frequency to generate a plurality of slices at the second frequency, each of the slices comprising a pair of values; transforming at least some of the plurality of slices at the second frequency to slices at the second frequency plus or minus an offset, and generating a filter having a center frequency at the second frequency plus or minus the offset by combining the transformed slices. 15. The method of claim 14, wherein quantizing comprises using a 1-bit analog-to digital converter to generate the sampled values.