Wideband digital spectrometer

• US 9,906,248 B2
• Filed: 02/17/2017
• Issued: 02/27/2018
• Est. Priority Date: 05/23/2007
• Status: Active Grant

• Current Assignee: Hypres, Inc.
• Original Assignee: Hypres, Inc.
• Inventors: Gupta, Deepnarayan
• Primary Examiner(s): Tran, Khanh C
• Application Number:
  US15/436,332
• Publication Number:
  US 20170163301A1
• Time in Patent Office: 375 Days
• Field of Search: 375316, 375340, 375346, 375350, 375343, 708300, 708303, 708322
• CPC Class Codes: H04B 1/0028 wherein the AD/DA conversion occurs at baseband stage
• CPC Class Codes: H04B 1/109 by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
• CPC Class Codes: H04B 1/123 using adaptive balancing or compensation means adaptive filter circuits and algorithms H03H
• CPC Class Codes: H04B 1/38 Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving

Abstract

A processor, comprising a first data input configured to receive a stream of samples of a first signal having a spectral space, the stream having a data rate of at least 4 GHz; a second data input configured to receive a stream of samples of a second signal; a multitap correlator, configured to receive the first stream of samples and the second stream of samples, and producing at least one correlation output for each respective sequential sample of the first signal received; and a programmable control configured to alter a relationship of the stream of samples of the first signal and the stream of samples of the second signal, to thereby select, under program control, an alterable correlation output.

Claims

1. A radio reception method, comprising:

receiving a signal in a radio frequency band with a receiver, comprising a first signal component representing a radio frequency communication from a first transmitter which is remote with respect to the receiver, and a second signal component associated with a second transmitter which is co-located with respect to the receiver;

digitally controlling at least one delay element, to produce a delayed representation of a representation of a signal transmitted by the second transmitter, having a controllable phase with respect to the second signal component, in dependence on at least one of a digital correlation and a digital frequency transformation produced by a digital processor;

combining at least a portion of the second signal component with the delayed representation of the representation of the signal transmitted by the second transmitter, in an analog combiner element, to produce a modified signal having a suppressed portion of the second signal component;

digitizing the modified signal in an analog to digital converter;

digitally controlling the at least one delay element, in dependence on at least the digitized modified signal; and

digitally processing the digitized modified signal, to demodulate information communicated by the first transmitter in the first signal component, wherein the digitally controlled at least one delay element is effective for increasing a signal to noise ratio of the first signal component in the digitized modified signal.

2. The method to claim 1, wherein the analog to digital converter has a dynamic range insufficient to fully represent the information communicated by the first transmitter in the presence of the second signal component.

3. The method according to claim 2, wherein the analog to digital converter has a dynamic range sufficient to fully represent the information communicated by the first transmitter in the modified signal.

4. The method according to claim 1, wherein said digitally controlling the at least one delay element comprises processing the digitized modified signal with at least one digital correlator implemented within the digital processor.

5. The method according to claim 1, wherein said digitally controlling the at least one delay element comprises processing the digitized modified signal with at least one digital autocorrelator implemented within the digital processor.

6. The method according to claim 1, wherein the at least one delay element comprises a set of delay elements, each having a discrete delay, which are controlled by a set of weights to produce a representation having a selectively digitally controlled delay and amplitude.

7. The method according to claim 1, further comprising a plurality of input ports, each receiving a respective signal from an antenna element of an antenna array, the at least one delay element comprising a plurality of delay elements, respectively receiving a portion of the signal from the plurality of input ports.

8. The method according to claim 1, wherein the signal comprises intermodulation distortion components, and wherein the digitized modified signal has a reduced ratio of intermodulation distortion components to the first signal portion.

9. A radio receiver system, comprising:

an input configured to receive a signal in a radio frequency band;

a receiver, configured to receive the signal comprising a first signal component representing a radio frequency communication from a first transmitter which is remote with respect to the receiver, and a second signal component associated with a second transmitter which is co-located with respect to the receiver;

at least one delay element, configured to be digitally controlled to produce a delayed representation of a representation of a signal transmitted by the second transmitter, having a controllable phase with respect to the second signal component;

an analog combiner element, configured to combine at least a portion of the second signal component with the delayed representation of the representation of the signal transmitted by the second transmitter, to produce a modified signal having a suppressed portion of the second signal component, the analog combined element being effective under at least one state of a digital control signal to the at least one delay element, to increase a signal to noise ratio of the first signal component in the digitized modified signal;

an analog to digital converter configured to digitize the modified signal; and

at least one automated digital processor, configured to digitally control the at least one delay element to increase the signal to noise ratio of the first signal component in the digitized modified signal, in dependence on at least the digitized modified signal and at least one of a digital correlation and a digital frequency transformation, and digitally process the digitized modified signal, to demodulate information communicated by the first transmitter in the first signal component.

10. The system to claim 9, wherein the analog to digital converter has a dynamic range insufficient to fully represent the information communicated by the first transmitter in the presence of the second signal component.

11. The system according to claim 10, wherein the analog to digital converter has a dynamic range sufficient to fully represent the information communicated by the first transmitter in the modified signal.

12. The system according to claim 9, wherein the at least one automated digital processor comprises at least one digital correlator configured to process the digitized modified signal to perform the digital correlation.

13. The system according to claim 9, wherein the at least one automated digital processor comprises at least one digital autocorrelator configured to process the digitized modified signal to perform the digital correlation.

14. The system according to claim 9, wherein the at least one automated digital processor comprises at least one digital crosscorrelator configured to process the digitized modified signal to perform the digital correlation.

15. The system according to claim 9, wherein the at least one delay element comprises a set of delay elements, each having a discrete delay, which are controlled by a set of weights to produce a representation having a selectively digitally controlled delay and amplitude.

16. The system according to claim 9, further comprising a plurality of input ports, each receiving a respective signal from an antenna element of an antenna array, the at least one delay element comprising a plurality of delay elements, respectively receiving a portion of the signal from the plurality of input ports.

17. The system according to claim 9, wherein the signal comprises intermodulation distortion components, and wherein the at least one delay element is controlled to produce the digitized modified signal having a reduced ratio of intermodulation distortion components to the first signal portion.

18. A radio receiver for receiving information from radio frequency communications, comprising:

(a) an input port, configured to receive a first signal comprising the radio frequency communications;

(b) at least one analog delay element, configured to receive the first signal, and apply a delay and a selectively controlled weighting in dependence on an adaptively provided digital control signal, to produce a second signal;

(c) a combiner, configured to combine the first signal with the second signal, to produce a modified signal;

(c) a digitizer, configured to produce a digitized signal based on the modified signal; and

(e) an automated digital processor, configured to;

selectively control the at least one analog delay element, by controlling the delay and the selectively controlled weighting, to produce the second signal having at least a partial cancellation of at least one signal component in the first signal, based on the digitized signal, wherein the at least one signal component in the first signal is interfering with demodulation of an information component in the first signal, the at least partial cancellation of at least one signal component in the first signal being sufficient to permit demodulation of the information component in the first signal;

digitally cancel at least one residual component of the at least one signal component in the first signal which is interfering with demodulation of an information component in the first signal; and

demodulate the information component in the first signal.

19. The radio receiver according to claim 18, wherein the automated digital processor further comprises a digital correlator, configured to determine a delay of the at least one signal component in the first signal.

20. The radio receiver according to claim 18, wherein the at least one analog delay element comprises a plurality of analog delay elements having discrete delays, which are together controlled to produce the second signal.