METHODS, DEVICES AND SYSTEMS FOR RECEIVING AND DECODING A SIGNAL IN THE PRESENCE OF NOISE USING SLICES AND WARPING

• US 20150131764A1
• Filed: 09/19/2014
• Published: 05/14/2015
• Est. Priority Date: 09/20/2013
• Status: Active Grant

• Current Assignee: Proteus Digital Health, Inc. (Otsuka Holdings Company Limited)
• Original Assignee: Proteus Digital Health, Inc. (Otsuka Holdings Company Limited)
• Inventors: ZDEBLICK, MARK, KUSHNER, CHERIE, FLEMING, ROBERT, McALLISTER, WILLIAM H.
• Granted Patent: US 9,270,503 B2
• Time in Patent Office: Days
• US Class Current: 375/343
• CPC Class Codes: H04B 1/001 Channel filtering, i.e. selecting a frequency channel within the SDR system multiplexing of multicarrier modulation signals being represented by different frequencies H04L5/06; multiplexing of multicarrier modulation signals H04L5/023
• CPC Class Codes: H04L 25/08 Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
• CPC Class Codes: H04L 27/0014 Carrier regulation of chaotic carriers H04L27/001; for multicarrier receivers H04L27/2657
• CPC Class Codes: H04L 27/144 with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
• CPC Class Codes: H04L 27/148 using filters, including PLL-type filters
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04L 7/042 Detectors therefor, e.g. correlators, state machines digital correlators in general G06F17/15

Abstract

A method may comprise receiving and sampling a signal. The signal may encode a data packet. A slice may be generated and stored comprising a pair of values for each of a selected number of samples of the signal representing a correlation of the signal to reference functions in the receiver. The presence of the data packet may then be detected and the detected packet decoded from the stored slices. The generating and storing slices may be carried out as the received signal is sampled. The sampled values of the signal may be discarded as the slices are generated and stored. The slice representation of the signal can be manipulated to generate filters with flexible bandwidth and center frequency.

Claims

1. A method, comprising:

receiving a signal, the signal encoding a data packet;

sampling the received signal;

generating and storing a plurality of slices comprising pairs of values for each of a selected number of samples of the signal; and

detecting a presence of and decoding the data packet from the stored slices.

2. The method of claim 1, wherein generating and storing are carried out as the received signal is sampled.

3. The method of claim 1, further comprising discarding the sampled signal as the slice is generated therefrom and stored.

4. The method of claim 1, wherein generating and storing are carried out with constituent values of each of the slices being generated using a first reference function and a second reference function that is in quadrature with the first reference function.

5. The method of claim 1, wherein generating each of the plurality of slices comprises:

correlating samples of the signal with a first reference template;

generating a first value of the pair of values;

correlating the selected number of samples of the signal with a second reference template; and

generating a second value of the pair of values.

6. The method of claim 5, wherein the first reference template comprises a cosine function at a reference frequency and the second reference template comprises a sine function at the reference frequency.

7. The method of claim 6, wherein the first value of the pair of values of the slice comprises a dot product of the sampled signal and the cosine function at the reference frequency and the second value of the pair of values of the slice comprises a dot products of the sampled signal and the sine function at the reference frequency.

8. The method of claim 1, further comprising forming a filter by combining a number of the plurality of slices.

9. The method of claim 8, wherein a bandwidth of the filter is related to the number of combined slices.

10. The method of claim 9, wherein when a first number of slices are combined, the filter has a first bandwidth and wherein when a second number, greater than the first number, of slices are combined, the filter has a second bandwidth that is narrower than the first bandwidth.

11. The method of claim 1, wherein detecting the presence of the packet comprises detecting a carrier frequency within a pass-band of a filter formed by the plurality of slices.

12. The method of claim 1, wherein detecting the presence of the packet comprises detecting a carrier frequency within a pass-band of a filter formed by combining slices.

13. The method of claim 12, wherein detecting further comprises re-tuning a center frequency of the filter from a first center frequency to a second center frequency that is different from the first center frequency using the stored slices.

14. The method of claim 13, wherein re-tuning the center frequency of the filter comprises warping the slices from which the filter was formed by rotating the respective pairs of values thereof by a quantity.

15. The method of claim 14, wherein the quantity comprises a rotation angle, a scaling factor and indices associated with the slices from which the filter was formed.

16. The method of claim 14, wherein the quantity comprises a sum of a phase angle from a reference frequency and a product of a rotation angle and a slice index.

18. The signal receiver of claim 16, wherein the controller is configured to generate and store the slices as the ADC samples the received signal.

17. A signal receiver, comprising:

an analog-to-digital converter (ADC) configured to sample a received signal;

a memory;

a controller coupled to the memory and configured to;

generate and store, in the memory, a slice comprising a pair of values for each of a selected number of samples of the signal; and

detect a presence of and decode the data packet from the stored slices.

19. The signal receiver of claim 17, wherein the controller is further configured to discard the sampled signal as the slices are generated therefrom and stored.

20. The signal receiver of claim 17, wherein the controller is further configured to generate each of the slices such that constituent values thereof are generated using a first reference function and a second reference function that is in quadrature with the first reference function.

21. The signal receiver of claim 17 wherein the memory is configured to store at least a first reference template and a second reference template and wherein the controller is further configured to correlate the selected number of cycles of the sampled signal with the first reference template to generate a first value of the pair of values and to correlate the selected number of samples of the signal with the second reference template to generate a second value of the pair of values.

22. The signal receiver of claim 21, wherein the first reference template comprises a first reference function at a reference frequency and the second reference template comprises a second reference function at the reference frequency.

23. The signal receiver of claim 22, wherein the first reference function is in quadrature with the second reference function.

24. The signal receiver of claim 23, wherein the first reference function comprises a cosine function and the second reference function comprises a sine function.

25. The signal receiver of claim 24, wherein the first value of the pair of values of the slice comprises a dot product of the sampled signal and the cosine function at the reference frequency and the second value of the pair of values of the slice comprises a dot product of the sampled signal and the sine function at the reference frequency.

26. The signal receiver of claim 17, wherein the controller is further configured to combine a number of slices to form a filter.

27. The signal receiver of claim 26, wherein a bandwidth of the filter is related to the number of combined slices.

28. The signal receiver of claim 27, wherein when a first number of slices are combined, the filter has a first bandwidth and wherein when a second number, greater than the first number, of slices are combined, the filter has a second bandwidth that is narrower than the first bandwidth.

29. The signal receiver of claim 17, wherein the controller is further configured to detect the presence of the packet by detecting a carrier frequency within a pass-band of a filter formed by combining the slices.

30. The signal receiver of claim 29, wherein the controller is further configured to re-tune, using the stored slices, a center frequency of the filter from a first center frequency to a second center frequency that is different from the first center frequency.

31. The signal receiver of claim 17, wherein the controller is further configured to re-tune the center frequency of the filter by warping the slices from which the filter was formed by rotating the respective pairs of values thereof by a quantity.

32. The signal receiver of claim 31, wherein the quantity comprises a rotation angle, a scaling a factor and respective slice indices associated with the slices from which the filter was formed.

33. The signal receiver of claim 32, wherein the scaling factor is an integer.

34. The signal receiver of claim 32, wherein the scaling factor comprises an algebraic expression.

35-79. -79. (canceled)