CA2516767A1 - Coherent am demodulator using a weighted lsb/usb sum for interference mitigation - Google Patents
Coherent am demodulator using a weighted lsb/usb sum for interference mitigation Download PDFInfo
- Publication number
- CA2516767A1 CA2516767A1 CA002516767A CA2516767A CA2516767A1 CA 2516767 A1 CA2516767 A1 CA 2516767A1 CA 002516767 A CA002516767 A CA 002516767A CA 2516767 A CA2516767 A CA 2516767A CA 2516767 A1 CA2516767 A1 CA 2516767A1
- Authority
- CA
- Canada
- Prior art keywords
- demodulated
- signal
- sideband signal
- lower sideband
- upper sideband
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000001427 coherent effect Effects 0.000 title claims 4
- 230000000116 mitigating effect Effects 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract 15
- 238000001914 filtration Methods 0.000 claims 6
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/22—Homodyne or synchrodyne circuits
- H03D1/2245—Homodyne or synchrodyne circuits using two quadrature channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/06—Demodulator circuits; Receiver circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/02—Details
- H03D1/04—Modifications of demodulators to reduce interference by undesired signals
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/22—Homodyne or synchrodyne circuits
- H03D1/24—Homodyne or synchrodyne circuits for demodulation of signals wherein one sideband or the carrier has been wholly or partially suppressed
Abstract
A method of processing an AM radio signal comprises the step of receiving an AM radio signal including an upper sideband portion and a lower sideband portion, demodulating the upper sideband portion and the lower sideband portion to produce a demodulated upper sideband signal and a demodulated lower sideband signal, weighting the demodulated upper sideband signal and the demodulated lower sideband signal in response to noise power to produce a weighted demodulated upper sideband signal and a weighted demodulated lower sideband signal, and combining the weighted demodulated upper sideband signal and the weighted demodulated lower sideband signal to produce an output signal. Demodulators which process AM radio signals in accordance with the method, and receivers incorporating the demodulators, are also included.
Claims (26)
1. A method of processing an AM radio signal comprising the step of:
receiving an AM radio signal including an upper sideband portion and a lower sideband portion;
demodulating the upper sideband portion and the lower sideband portion to produce a demodulated upper sideband signal and a demodulated lower sideband signal;
weighting the demodulated upper sideband signal and the demodulated lower sideband signal in response to noise power to produce a weighted demodulated upper sideband signal and a weighted demodulated lower sideband signal; and combining the weighted demodulated upper sideband signal and the weighted demodulated lower sideband signal to produce an output signal.
receiving an AM radio signal including an upper sideband portion and a lower sideband portion;
demodulating the upper sideband portion and the lower sideband portion to produce a demodulated upper sideband signal and a demodulated lower sideband signal;
weighting the demodulated upper sideband signal and the demodulated lower sideband signal in response to noise power to produce a weighted demodulated upper sideband signal and a weighted demodulated lower sideband signal; and combining the weighted demodulated upper sideband signal and the weighted demodulated lower sideband signal to produce an output signal.
2. The method of claim 1, further comprising the step of:
single sideband filtering the AM radio signal prior to the step of demodulating the upper sideband portion and the lower sideband portion.
single sideband filtering the AM radio signal prior to the step of demodulating the upper sideband portion and the lower sideband portion.
3. The method of claim 1, further comprising the step of:
determining the noise power of the demodulated upper sideband signal and the demodulated lower sideband signal prior to the step of weighting the demodulated upper sideband signal and the demodulated lower sideband signal.
determining the noise power of the demodulated upper sideband signal and the demodulated lower sideband signal prior to the step of weighting the demodulated upper sideband signal and the demodulated lower sideband signal.
4. The method of claim 3, wherein the step of determining the noise power of the demodulated upper sideband signal and the demodulated lower sideband signal comprises the steps of:
cross-correlating a quadrature component of the demodulated upper sideband signal with the demodulated upper sideband signal; and cross-correlating a quadrature component of the demodulated lower sideband signal with the demodulated lower sideband signal.
cross-correlating a quadrature component of the demodulated upper sideband signal with the demodulated upper sideband signal; and cross-correlating a quadrature component of the demodulated lower sideband signal with the demodulated lower sideband signal.
5. The method of claim 4, wherein:
the step of cross-correlating a quadrature component of the demodulated upper sideband signal with the demodulated upper sideband signal comprises the steps of shifting the quadrature component of the demodulated upper sideband signal by 90° and multiplying the shifted quadrature component of the demodulated upper sideband signal by the demodulated upper sideband signal; and the step of cross-correlating a quadrature component of the demodulated lower sideband signal with the demodulated lower sideband signal comprises the steps of shifting the quadrature component of the demodulated lower sideband signal by 90 ° and multiplying the shifted quadrature component of the demodulated lower sideband signal by the demodulated lower sideband signal.
the step of cross-correlating a quadrature component of the demodulated upper sideband signal with the demodulated upper sideband signal comprises the steps of shifting the quadrature component of the demodulated upper sideband signal by 90° and multiplying the shifted quadrature component of the demodulated upper sideband signal by the demodulated upper sideband signal; and the step of cross-correlating a quadrature component of the demodulated lower sideband signal with the demodulated lower sideband signal comprises the steps of shifting the quadrature component of the demodulated lower sideband signal by 90 ° and multiplying the shifted quadrature component of the demodulated lower sideband signal by the demodulated lower sideband signal.
6. The method of claim 1, wherein the step of weighting the demodulated upper sideband signal and the demodulated lower sideband comprises the steps of:
multiplying the demodulated upper sideband signal by a weighting factor;
and multiplying the demodulated lower sideband signal by one minus the weighting factor.
multiplying the demodulated upper sideband signal by a weighting factor;
and multiplying the demodulated lower sideband signal by one minus the weighting factor.
7. The method of claim 1, wherein the weighting factor is a function of the variance of interference plus noise.
8. The method of claim 1, wherein the step of combining the weighted demodulated upper sideband signal and the weighted demodulated lower sideband signal further comprising the step of:
frequency selective combining of the weighted demodulated upper sideband signal and the weighted demodulated lower sideband signal.
frequency selective combining of the weighted demodulated upper sideband signal and the weighted demodulated lower sideband signal.
9. The method of claim 1, further comprising the step filtering the upper sideband portion and the lower sideband portion prior to the step of demodulating the upper sideband portion and the lower sideband portion.
10. The method of claim 9, wherein the step filtering the upper sideband portion and the lower sideband portion comprises the step of passing the upper sideband portion and the lower sideband portion through a plurality of bandpass filters to produce a plurality of filtered signals, and wherein the step of demodulating the upper sideband portion and the lower sideband portion comprises the step of demodulating the plurality of filtered signals to produce a plurality of demodulated signals.
11. A method of processing an AM radio signal including an upper sideband portion and a lower sideband portion, the method comprising the steps of:
multiplying a Hilbert Transform of an imaginary component of the radio signal by a weighted correction signal to obtain a weighted signal; and subtracting the weighted signal from a coherent double sideband signal.
multiplying a Hilbert Transform of an imaginary component of the radio signal by a weighted correction signal to obtain a weighted signal; and subtracting the weighted signal from a coherent double sideband signal.
12. A demodulator for processing an AM radio signal comprising:
means for demodulating the upper sideband portion and the lower sideband portion of an AM radio signal to produce a demodulated upper sideband signal and a demodulated lower sideband signal;
means for weighting the demodulated upper sideband signal and the demodulated lower sideband signal in response to noise power to produce a weighted demodulated upper sideband signal and a weighted demodulated lower sideband signal;
and means for combining the weighted demodulated upper sideband signal and the weighted demodulated lower sideband signal.
means for demodulating the upper sideband portion and the lower sideband portion of an AM radio signal to produce a demodulated upper sideband signal and a demodulated lower sideband signal;
means for weighting the demodulated upper sideband signal and the demodulated lower sideband signal in response to noise power to produce a weighted demodulated upper sideband signal and a weighted demodulated lower sideband signal;
and means for combining the weighted demodulated upper sideband signal and the weighted demodulated lower sideband signal.
13. The demodulator of claim 12, further comprising:
means for determining the noise power of the demodulated upper sideband signal and the demodulated lower sideband signal prior to weighting the demodulated upper sideband signal and the demodulated lower sideband signal.
means for determining the noise power of the demodulated upper sideband signal and the demodulated lower sideband signal prior to weighting the demodulated upper sideband signal and the demodulated lower sideband signal.
14. The demodulator of claim 13, wherein the means for determining the noise power of the demodulated upper sideband signal and the demodulated lower sideband signal comprises:
means for cross-correlating a quadrature component of the demodulated upper sideband signal with the demodulated upper sideband signal; and means for cross-correlating a quadrature component of the demodulated lower sideband signal with the demodulated lower sideband signal.
means for cross-correlating a quadrature component of the demodulated upper sideband signal with the demodulated upper sideband signal; and means for cross-correlating a quadrature component of the demodulated lower sideband signal with the demodulated lower sideband signal.
15. The demodulator of claim 14-, wherein:
the means for cross-correlating the quadrature component of the demodulated upper sideband signal with the demodulated upper sideband signal comprises means for shifting the quadrature component of the demodulated upper sideband signal by 90° and for multiplying the shifted quadrature component of the demodulated upper sideband signal by the demodulated upper sideband signal; and the means for cross-correlating the quadrature component of the demodulated lower sideband signal with the demodulated lower sideband signal comprises means for shifting the quadrature component of the demodulated lower sideband signal by 90° and for multiplying the shifted quadrature component of the demodulated lower sideband signal by the demodulated lower sideband signal.
the means for cross-correlating the quadrature component of the demodulated upper sideband signal with the demodulated upper sideband signal comprises means for shifting the quadrature component of the demodulated upper sideband signal by 90° and for multiplying the shifted quadrature component of the demodulated upper sideband signal by the demodulated upper sideband signal; and the means for cross-correlating the quadrature component of the demodulated lower sideband signal with the demodulated lower sideband signal comprises means for shifting the quadrature component of the demodulated lower sideband signal by 90° and for multiplying the shifted quadrature component of the demodulated lower sideband signal by the demodulated lower sideband signal.
16. The demodulator of claim 12, wherein the means for weighting the demodulated upper sideband signal and the demodulated lower sideband signal comprises:
means for multiplying the demodulated upper sideband signal by a weighting factor; and means for multiplying the demodulated lower sideband signal by one minus the weighting factor.
means for multiplying the demodulated upper sideband signal by a weighting factor; and means for multiplying the demodulated lower sideband signal by one minus the weighting factor.
17. The demodulator of claim 12, further comprising:
means for filtering the upper sideband portion and the lower sideband portion.
means for filtering the upper sideband portion and the lower sideband portion.
18. A demodulator for processing an AM radio signal including an upper sideband portion and a lower sideband portion, the demodulator comprising:
means for multiplying a Hilbert Transform of an imaginary component of the radio signal by a weighted correction signal to obtain a weighted signal;
and means for subtracting the weighted signal from a coherent double sideband signal.
means for multiplying a Hilbert Transform of an imaginary component of the radio signal by a weighted correction signal to obtain a weighted signal;
and means for subtracting the weighted signal from a coherent double sideband signal.
19. A receiver for processing an AM radio signal comprising:
means for receiving an AM radio signal including an upper sideband porn~n and a lower sideband portion;
means for demodulating the upper sideband portion and the lower sideband portion to produce a demodulated upper sideband signal and a demodulated lower sideband signal;
means for weighting the demodulated upper sideband signal and the demodulated lower sideband signal in response to noise power to produce a weighted demodulated upper sideband signal and a weighted demodulated lower sideband signal;
and means for combining the weighted demodulated upper sideband signal and the weighted demodulated lower sideband signal to produce an output signal.
means for receiving an AM radio signal including an upper sideband porn~n and a lower sideband portion;
means for demodulating the upper sideband portion and the lower sideband portion to produce a demodulated upper sideband signal and a demodulated lower sideband signal;
means for weighting the demodulated upper sideband signal and the demodulated lower sideband signal in response to noise power to produce a weighted demodulated upper sideband signal and a weighted demodulated lower sideband signal;
and means for combining the weighted demodulated upper sideband signal and the weighted demodulated lower sideband signal to produce an output signal.
20. The receiver of claim 19, further comprising:
means for single sideband filtering the AM radio signal prior to demodulating the upper sideband portion and the lower sideband portion.
means for single sideband filtering the AM radio signal prior to demodulating the upper sideband portion and the lower sideband portion.
21. The receiver of claim 19, further comprising:
means for determining the noise power of the demodulated upper sideband signal and the demodulated lower sideband signal prior to weighting the demodulated upper sideband signal and the demodulated lower sideband signal.
means for determining the noise power of the demodulated upper sideband signal and the demodulated lower sideband signal prior to weighting the demodulated upper sideband signal and the demodulated lower sideband signal.
22. The receiver of claim 21, wherein the means for determining the noise power of the demodulated upper sideband signal and the demodulated lower sideband signal comprises:
means for cross-correlating a quadrature component of the demodulated upper sideband signal with the demodulated upper sideband signal; and means for cross-correlating a quadrature component of the demodulated lower sideband signal with the demodulated lower sideband signal.
means for cross-correlating a quadrature component of the demodulated upper sideband signal with the demodulated upper sideband signal; and means for cross-correlating a quadrature component of the demodulated lower sideband signal with the demodulated lower sideband signal.
23. The receiver of claim 22, wherein:
the means for cross-correlating the quadrature component of the demodulated upper sideband signal with the demodulated upper sideband signal comprises means for shifting the quadrature component of the demodulated upper sideband signal by 90° and for multiplying the shifted quadrature component of the demodulated upper sideband signal by the demodulated upper sideband signal; and the means for cross-correlating the quadrature component of the demodulated lower sideband signal with the demodulated lower sideband signal comprises means for shifting the quadrature component of the demodulated lower sideband signal by 90° and for multiplying the shifted quadrature component of the demodulated lower sideband signal by the demodulated lower sideband signal.
the means for cross-correlating the quadrature component of the demodulated upper sideband signal with the demodulated upper sideband signal comprises means for shifting the quadrature component of the demodulated upper sideband signal by 90° and for multiplying the shifted quadrature component of the demodulated upper sideband signal by the demodulated upper sideband signal; and the means for cross-correlating the quadrature component of the demodulated lower sideband signal with the demodulated lower sideband signal comprises means for shifting the quadrature component of the demodulated lower sideband signal by 90° and for multiplying the shifted quadrature component of the demodulated lower sideband signal by the demodulated lower sideband signal.
24. The receiver of claim 19, wherein the means for weighting the demodulated upper sideband signal and the demodulated lower sideband signal comprises:
means for multiplying the demodulated upper sideband signal by a weighting factor; and means for multiplying the demodulated lower sideband signal by one minus the weighting factor.
means for multiplying the demodulated upper sideband signal by a weighting factor; and means for multiplying the demodulated lower sideband signal by one minus the weighting factor.
25. The receiver of claim 19, further comprising:
means for filtering the upper sideband portion and a lower sideband portion.
means for filtering the upper sideband portion and a lower sideband portion.
26. A receiver for processing an AM radio signal comprising:
means for receiving an AM radio signal including an upper sideband portion and a lower sideband portion; and a demodulator for demodulating the upper sideband portion and the lower sideband portion, the demodulator including means for multiplying a Hilbert Transform of an imaginary component of the radio signal by a weighted correction signal to obtain a weighted signal, and means for subtracting the weighted signal from a coherent double sideband signal.
means for receiving an AM radio signal including an upper sideband portion and a lower sideband portion; and a demodulator for demodulating the upper sideband portion and the lower sideband portion, the demodulator including means for multiplying a Hilbert Transform of an imaginary component of the radio signal by a weighted correction signal to obtain a weighted signal, and means for subtracting the weighted signal from a coherent double sideband signal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/373,484 US7127008B2 (en) | 2003-02-24 | 2003-02-24 | Coherent AM demodulator using a weighted LSB/USB sum for interference mitigation |
| US10/373,484 | 2003-02-24 | ||
| PCT/US2004/002549 WO2004077667A2 (en) | 2003-02-24 | 2004-01-29 | Coherent am demodulator using a weighted lsb/usb sum for interference mitigation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2516767A1 true CA2516767A1 (en) | 2004-09-10 |
| CA2516767C CA2516767C (en) | 2012-05-22 |
Family
ID=32868723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2516767A Expired - Lifetime CA2516767C (en) | 2003-02-24 | 2004-01-29 | Coherent am demodulator using a weighted lsb/usb sum for interference mitigation |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US7127008B2 (en) |
| EP (1) | EP1597820B1 (en) |
| JP (1) | JP4440255B2 (en) |
| KR (1) | KR101016876B1 (en) |
| CN (1) | CN1754308B (en) |
| AR (1) | AR043262A1 (en) |
| AT (1) | ATE368325T1 (en) |
| AU (1) | AU2004214862B2 (en) |
| BR (1) | BRPI0407725B1 (en) |
| CA (1) | CA2516767C (en) |
| CL (1) | CL2004000295A1 (en) |
| DE (1) | DE602004007770T2 (en) |
| MX (1) | MXPA05008260A (en) |
| RU (1) | RU2342772C2 (en) |
| TW (1) | TWI324001B (en) |
| WO (1) | WO2004077667A2 (en) |
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-
2003
- 2003-02-24 US US10/373,484 patent/US7127008B2/en not_active Expired - Lifetime
-
2004
- 2004-01-20 TW TW093101595A patent/TWI324001B/en not_active IP Right Cessation
- 2004-01-29 AT AT04706512T patent/ATE368325T1/en not_active IP Right Cessation
- 2004-01-29 WO PCT/US2004/002549 patent/WO2004077667A2/en active IP Right Grant
- 2004-01-29 CN CN2004800050556A patent/CN1754308B/en not_active Expired - Lifetime
- 2004-01-29 RU RU2005129716/09A patent/RU2342772C2/en not_active IP Right Cessation
- 2004-01-29 JP JP2006503155A patent/JP4440255B2/en not_active Expired - Lifetime
- 2004-01-29 CA CA2516767A patent/CA2516767C/en not_active Expired - Lifetime
- 2004-01-29 EP EP04706512A patent/EP1597820B1/en not_active Expired - Lifetime
- 2004-01-29 DE DE602004007770T patent/DE602004007770T2/en not_active Expired - Lifetime
- 2004-01-29 KR KR1020057015535A patent/KR101016876B1/en active IP Right Grant
- 2004-01-29 BR BRPI0407725A patent/BRPI0407725B1/en active IP Right Grant
- 2004-01-29 AU AU2004214862A patent/AU2004214862B2/en not_active Expired
- 2004-01-29 MX MXPA05008260A patent/MXPA05008260A/en active IP Right Grant
- 2004-02-19 CL CL200400295A patent/CL2004000295A1/en unknown
- 2004-02-23 AR ARP040100560A patent/AR043262A1/en active IP Right Grant
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| BRPI0407725A (en) | 2006-02-14 |
| RU2005129716A (en) | 2006-01-27 |
| EP1597820A4 (en) | 2006-05-31 |
| CN1754308B (en) | 2010-05-12 |
| AU2004214862A1 (en) | 2004-09-10 |
| US7127008B2 (en) | 2006-10-24 |
| EP1597820B1 (en) | 2007-07-25 |
| ATE368325T1 (en) | 2007-08-15 |
| RU2342772C2 (en) | 2008-12-27 |
| WO2004077667A2 (en) | 2004-09-10 |
| JP4440255B2 (en) | 2010-03-24 |
| CL2004000295A1 (en) | 2005-05-20 |
| CA2516767C (en) | 2012-05-22 |
| DE602004007770D1 (en) | 2007-09-06 |
| AU2004214862B2 (en) | 2009-05-07 |
| MXPA05008260A (en) | 2005-09-20 |
| TW200428832A (en) | 2004-12-16 |
| AR043262A1 (en) | 2005-07-20 |
| US20040165680A1 (en) | 2004-08-26 |
| KR101016876B1 (en) | 2011-02-22 |
| TWI324001B (en) | 2010-04-21 |
| DE602004007770T2 (en) | 2008-04-30 |
| EP1597820A2 (en) | 2005-11-23 |
| BRPI0407725B1 (en) | 2017-03-28 |
| JP2006518966A (en) | 2006-08-17 |
| CN1754308A (en) | 2006-03-29 |
| KR20050105234A (en) | 2005-11-03 |
| WO2004077667A3 (en) | 2004-12-29 |
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