SELECTIVE-SAMPLING RECEIVER

• US 20130023225A1
• Filed: 07/19/2012
• Published: 01/24/2013
• Est. Priority Date: 07/21/2011
• Status: Active Grant

• Current Assignee: Weber Technologies, Inc. (Standex International Corporation)
• Original Assignee: Weber Technologies, Inc. (Standex International Corporation)
• Inventors: Weber, Daniel A.
• Granted Patent: US 8,934,587 B2
• Time in Patent Office: Days
• US Class Current: 455/296
• CPC Class Codes: G01S 7/023 Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques auxiliary means for detecting or identifying radar signals or the like G01S7/021; means for anti-jamming G01S7/36
• CPC Class Codes: G01S 7/2813 Means providing a modification of the radiation pattern for cancelling noise, clutter or interfering signals, e.g. side lobe suppression, side lobe blanking, null-steering arrays specially adapted to secondary radar systems G01S13/762; aerials or aerials systems H01Q21/29, H01Q25/00
• CPC Class Codes: G01S 7/36 Means for anti-jamming , e.g. ECCM, i.e. electronic counter-counter measures

Abstract

A receiver that selectively samples a received signal in order to suppress an interference component of the signal while recovering a desired component. The selective sampling may be accomplished by low cost, low complex analog or digital circuitry. The receiver includes a first input that receives a first signal, including a desired signal component and an interference signal component and a second input that receives a second signal including the interference component only. The first and second signals are then provided to the sampling circuitry. First, the phase of the interference component of the both the first and second signals is aligned. Next, the points in a wave cycle that the second signal is at a power minimum are detected. Finally, first signal is sampled close to the point when the second signal is at the power minimum to recover the desired signal component and suppress the interference component.

Claims

1. A method for removing unwanted components from a signal, the method comprising:

receiving a signal that includes a desired component and an unwanted component;

receiving timing information of the desired component;

selective sampling the signal with the timing information or sampling the signal after the demodulation of the sum and delta channels to recover the unwanted component with a selective sampling receiver or a subtraction stage; and

determining the desired component from the signal using the unwanted component.

2. The method of claim 1, wherein the timing information includes zero crossings of the desired component.

3. The method of claim 2, wherein the timing information is delivered at a different frequency or modulated on a carrier.

4. The method of claim 1, further comprising determining the desired component by subtracting, using the selective sampling receiver or the subtraction stage or both the selective sampling receiver and the subtraction stage, the recovered unwanted component from the signal.

5. The method of claim 1, wherein the unwanted component includes noise or thermal noise.

8. The method of claim 5, wherein the higher frequency signal produces multiple zero crossings for the sum and delta channels or the first signal and/or the second signal, wherein the first signal and/or the second signal are reconstructed from samples taken at the multiple zero crossings.

21. A computer readable medium having computer executable instructions for performing a method of claim 1.

6. A method for raising a sampling ratio of samples in a selective sampling receiver to exceed a Nyquist sampling rate, the method comprising:

receiving first and second signals;

allowing a higher frequency signal having a larger amplitude than the first and second signals to coherently generate mixed first and second signals; and

sampling the mixed first and second signals at zero crossings, wherein an amplitude of a desired signal is offset by an instantaneous amplitude of the desired signal, wherein the desired signal is included in one of the first and second signals.

7. The method of claim 6, further comprising tuning out noise based on at least one of an angle of approach using antenna networks and nulls, frequency matched signals, phase delay, signal polarity and modulation type.

9. A method for using a bandwidth to transmit multiple data streams, the method comprising:

sending multiple data streams over a network;

receiving the multiple data streams with a receiver; and

separating the multiple data streams, wherein the receiver separates each of the multiple streams.

11. The method of claim 9, wherein separating the multiple data stream comprises separating the multiple data streams based an amplitude.

12. The method of claim 9, wherein separating the multiple data streams comprises separating the multiple data streams based on phase or time delays.

13. The method of claim 9, wherein the receiver comprises a selective sampling receiver.

14. The method of claim 12, wherein the receiver includes a sum channel and a delta channel, wherein outputs of the sum channel and the delta channel are provided to the selective sampling receiver in order to separate the multiple data streams.

15. The method of claim 9, further comprising recovering a particular coherent data stream from the multiple data streams using a SSR or a cancellation/subtraction stage, wherein other data streams appear as non-coherent noise with respect to the particular data stream, wherein the receiver separates out the particular data stream by treating the other data streams in the multiple data streams as the non-coherent noise.

16. The method of claim 9, further comprising transmitting each data stream twice, once as an original signal and once as an altered signal.

17. The method of claim 16, wherein the altered signal is a delayed/phased signal and a delay/phase is determined and used to recover a particular data stream by making the desired data stream coherent before the delta channel nulls the desired data stream for use in a selective sampling receiver, digitally sampling based on the delay for the particular data stream before signal processing applied by the selective sampling process.

19. The method of claim 16, wherein the altered signal includes an amplitude change.

20. The method of claim 16, wherein a selective sampling receiver transmits the multiple data streams and wherein another selectice sampling receiver receives the multiple data streams and is configured to separate the multiple data streams.

10. The method of claim 10, further comprising sending the multiple data streams over multiple frequency channels.

18. The method of claim 10, further comprising performing the selective sampling process or the subtraction stage in software.