WO1997031425B1 - Method and system for determining the integrity of a received signal - Google Patents
Method and system for determining the integrity of a received signalInfo
- Publication number
- WO1997031425B1 WO1997031425B1 PCT/US1997/002807 US9702807W WO9731425B1 WO 1997031425 B1 WO1997031425 B1 WO 1997031425B1 US 9702807 W US9702807 W US 9702807W WO 9731425 B1 WO9731425 B1 WO 9731425B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- statistic
- strength
- frequency
- predetermined value
- Prior art date
Links
- 230000002452 interceptive Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
Abstract
A method for determining the integrity of a received signal in a frequency tracking environment so that a determination can be made whether Automatic Frequency Control (AFC) can be utilized. Several samples of the frequency are taken (205). At least one statistic based on these frequency samples is calculated for use in determining whether the received signal may be used for AFC operation. These statistics may include, for example, the mean, the mean deviation, the standard deviation, and the variance of the measured frequency. A strong signal limit and a weak signal limit are used to determine whether AFC operation should be disabled. If the calculated statistic is less than the strong signal limit (210) then AFC operation is enabled. If the calculated statistic is also greater than the weak signal limit (220) then AFC operation is disabled (225). This allows the receiver to continue AFC operation until the signal level is so weak as to cause erroneous frequency measurements. If the calculated statistic is between the strong signal limit (210) and the weak signal limit (220) then the signal strength is tested (230). If the signal strength is below a minimum value then AFC operation is enabled but if the signal strength is above this minimum value then AFC operation is disabled because a strong interfering signal may be present.
Claims
1. A method for determining whether the quality of a signal is acceptable, comprising the steps of: measuring the frequency of said signal N times; computing a statistic concerning said frequency of said signal; if said statistic is less than a first predetermined value then declaring said quality to be acceptable; if said statistic is greater than said first predetermined value then determining whether said statistic is greater than a second predetermined value; and if said statistic is greater than said second predetermined value then declaring said signal to be unacceptable.
2. The method of Claim 1 and further comprising the steps of: if said statistic is less than said second predetermined value then measuring the strength of said signal and determining whether said strength is less than a predetermined signal strength value; if said strength is less than said predetermined signal strength value then declaring said received signal to be acceptable.
3. The method of Claim 2 and further comprising the step of declaring said signal to be unacceptable if said signal strength is greater than said predetermined signal strength value.
4. The method of Claim 1 wherein said step of computing a statistic comprises determining a mean deviation for said signal.
5. The method of Claim 1 wherein said step of computing a statistic comprises determining a standard deviation for said signal.
6. The method of Claim 1 wherein said step of computing a statistic comprises determining a variance for said signal.
7. A method for determining whether to enable automatic frequency control (AFC) operation based upon the quality of a signal, comprising the steps of: measuring the frequency of said signal N times; computing a statistic concerning said frequency of said signal; if said statistic is less than a first predetermined value then enabling said AFC operation; if said statistic is greater than said first predetermined value then determining whether said statistic is greater than a second predetermined value; and if said statistic is greater than said second predetermined value then disabling said AFC operation.
8. The method of Claim 7 and further comprising the steps of: if said statistic is less than said second predetermined value then measuring the strength of said signal and determining whether said strength is less than a predetermined signal strength value; if said strength is less than said predetermined signal strength value then enabling said AFC operation.
9. The method of Claim 8 and further comprising the step of disabling said AFC operation if said signal strength is greater than said predetermined signal strength value.
10. The method of Claim 7 wherein said step of computing a statistic comprises determining a mean deviation for said signal.
11. The method of Claim 7 wherein said step of computing a statistic comprises determining a standard deviation for said signal.
12. The method of Claim 7 wherein said step of computing a statistic comprises determining a variance for said signal. - 26 -
13. A receiver, comprising: a mixer for mixing a first signal and a second signal to provide a third signal; an oscillator for providing said second signal; a frequency control circuit responsive to said third signal for controlling the frequency of said oscillator; a circuit for measuring the frequency of said third signal; and a controller comprising means for determining a statistic on said frequency of said third signal and enabling said frequency control circuit if said statistic is less than a first predetermined value, means for determining whether said statistic is greater than a second predetermined value if said statistic is greater than said first predetermined value, and means for disabling said frequency control circuit if said statistic is greater than said second predetermined value.
14. The receiver of Claim 13 wherein said controller further comprises: means for measuring the strength of said signal and determining whether said strength is less than a predetermined signal strength value if said statistic is less than said second predetermined value; and means for enabling said frequency control circuit if said strength is less than said predetermined signal strength value.
15. The receiver of Claim 14 wherein said controller further comprises means for disabling said frequency control circuit if said signal strength is greater than said predetermined signal strength value.
16. The receiver of Claim 13 wherein said controller further comprises means for computing a mean deviation for said signal.
17. The receiver of Claim 13 wherein said controller further comprises means for computing a standard deviation for said signal.
18. The receiver of Claim 13 wherein said controller further comprises means for computing a variance for said signal.
AMENDED SHEET (ARTICLE 1ft)
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR9707683-0A BR9707683A (en) | 1996-02-23 | 1997-02-21 | Process and system for determining the totality of a received signal |
| AU19700/97A AU709398C (en) | 1996-02-23 | 1997-02-21 | Method and system for determining the integrity of a received signal |
| EP97907793A EP0886916A2 (en) | 1996-02-23 | 1997-02-21 | Method and system for determining the integrity of a received signal |
| JP53035997A JP2001509972A (en) | 1996-02-23 | 1997-02-21 | Method and apparatus for determining the integrity of a received signal |
| SE9802719A SE520243C2 (en) | 1996-02-23 | 1998-08-13 | Methods and systems for determining the completeness of a signal |
| HK99103874A HK1018857A1 (en) | 1996-02-23 | 1999-09-07 | Method and system for determining the integrity of a received signal |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US1219896P | 1996-02-23 | 1996-02-23 | |
| US60/012,198 | 1996-02-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1997031425A1 WO1997031425A1 (en) | 1997-08-28 |
| WO1997031425B1 true WO1997031425B1 (en) | 1997-10-02 |
Family
ID=21753819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1997/002807 WO1997031425A1 (en) | 1996-02-23 | 1997-02-21 | Method and system for determining the integrity of a received signal |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5940748A (en) |
| EP (1) | EP0886916A2 (en) |
| JP (1) | JP2001509972A (en) |
| CN (1) | CN1107378C (en) |
| BR (1) | BR9707683A (en) |
| CA (1) | CA2247241A1 (en) |
| HK (1) | HK1018857A1 (en) |
| SE (1) | SE520243C2 (en) |
| WO (1) | WO1997031425A1 (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0949758B1 (en) * | 1998-04-01 | 2004-06-09 | Motorola Semiconducteurs S.A. | Communications system, mobile device and method |
| US6229991B1 (en) * | 1998-10-13 | 2001-05-08 | Motorola, Inc. | Method of and apparatus for automatic frequency control range extension |
| US6324228B1 (en) * | 1998-12-30 | 2001-11-27 | International Business Machines Corporation | Method and apparatus for robust frequency tracking in strong channel interference using carrier signal relative strength and frequency error |
| US6124764A (en) * | 1999-01-22 | 2000-09-26 | Telefonaktiebolaget Lm Ericsson | Stable low-power oscillator |
| US6480555B1 (en) * | 1999-09-02 | 2002-11-12 | Motorola, Inc. | Method and apparatus for extended range frequency correction burst detection |
| JP3988392B2 (en) * | 2001-01-24 | 2007-10-10 | 日本電気株式会社 | Portable wireless terminal, AFC control method, and AFC control program |
| US7190937B1 (en) * | 2001-05-21 | 2007-03-13 | Counter Technologies, Llc | Method for determining the frequency of a radio signal and monitoring communications with a radio receiver |
| US7046964B1 (en) * | 2001-05-21 | 2006-05-16 | Counter Technologies, Llc | Method and apparatus for determining the frequency of a radio signal during periods of stability and monitoring communications with a radio receiver |
| EP1337068A1 (en) * | 2002-02-19 | 2003-08-20 | TELEFONAKTIEBOLAGET LM ERICSSON (publ) | Interference measurement |
| EP1497922A4 (en) * | 2002-04-25 | 2005-05-04 | Thomson Licensing Sa | A synchronization signal processor |
| WO2003092178A1 (en) * | 2002-04-26 | 2003-11-06 | Qualcomm, Incorporated | Dynamic noise floors in a wireless device |
| US7809087B2 (en) * | 2002-04-26 | 2010-10-05 | Qualcomm, Incorporated | Power detection techniques and discrete gain state selection for wireless networking |
| EP1514348B1 (en) * | 2002-06-07 | 2008-02-06 | Nxp B.V. | Method and apparatus for auto-tuning of a radio fm-receiver |
| JP2004080223A (en) * | 2002-08-14 | 2004-03-11 | Nec Corp | Afc apparatus, its operation control method and mobile communication apparatus using the same |
| US6925291B2 (en) * | 2002-09-27 | 2005-08-02 | Thomson Licensing S.A. | Electronic alignment system for a television signal tuner |
| US6867728B1 (en) * | 2003-11-06 | 2005-03-15 | Lockheed Martin Corporation | Methods and systems for identifying signals-of-interest |
| MY138841A (en) * | 2004-07-08 | 2009-07-31 | Sony Emcs Malaysia Sdn Bhd | Electronic switch for tv signal booster |
| EP1940024B1 (en) * | 2006-12-29 | 2011-06-29 | Motorola Mobility, Inc. | Method and apparatus for intermediate frequency selection |
| WO2008089840A1 (en) * | 2007-01-22 | 2008-07-31 | Freescale Semiconductor, Inc. | Very low intermediate frequency (vlif) receiver |
| DE102007037105A1 (en) * | 2007-05-09 | 2008-11-13 | Rohde & Schwarz Gmbh & Co. Kg | Method and device for detecting simultaneous double transmission of AM signals |
| JP4818439B2 (en) * | 2010-01-15 | 2011-11-16 | 株式会社東芝 | Electronic device and reception channel presetting method |
| US9762271B2 (en) | 2014-01-03 | 2017-09-12 | Telefonaktiebolaget Lm Ericsson (Publ) | Method for adjusting lo frequencies in receiver and associated receiver |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1509913A (en) * | 1974-05-21 | 1978-05-04 | Racal Instruments Ltd | Electrical circuit arrangements for converting an input signal of variable frequency to a signal of predetermined mean frequency |
| US4123716A (en) * | 1976-08-12 | 1978-10-31 | The Magnavox Company | Automatic frequency control for digital tuning systems |
| US4099048A (en) * | 1976-11-09 | 1978-07-04 | Westinghouse Electric Corp. | Count logic circuit |
| US4998289A (en) * | 1988-06-02 | 1991-03-05 | Motorola, Inc. | Signal integrity control technique for an RF communication system |
| US5446756A (en) * | 1990-03-19 | 1995-08-29 | Celsat America, Inc. | Integrated cellular communications system |
| SE470036B (en) * | 1992-03-24 | 1993-10-25 | Ericsson Telefon Ab L M | Method of locating a mobile station in a mobile telephone system |
| CA2098660C (en) * | 1992-06-23 | 1999-08-03 | Gen Suganuma | Automatic frequency control circuit |
-
1997
- 1997-02-21 JP JP53035997A patent/JP2001509972A/en not_active Ceased
- 1997-02-21 BR BR9707683-0A patent/BR9707683A/en not_active IP Right Cessation
- 1997-02-21 WO PCT/US1997/002807 patent/WO1997031425A1/en not_active Application Discontinuation
- 1997-02-21 EP EP97907793A patent/EP0886916A2/en not_active Withdrawn
- 1997-02-21 CA CA002247241A patent/CA2247241A1/en not_active Abandoned
- 1997-02-21 CN CN97193811A patent/CN1107378C/en not_active Expired - Fee Related
- 1997-02-21 US US08/804,716 patent/US5940748A/en not_active Expired - Fee Related
-
1998
- 1998-08-13 SE SE9802719A patent/SE520243C2/en not_active IP Right Cessation
-
1999
- 1999-09-07 HK HK99103874A patent/HK1018857A1/en not_active IP Right Cessation
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO1997031425B1 (en) | Method and system for determining the integrity of a received signal | |
| SE9802719D0 (en) | Method and system for determining the integrity of a received signal | |
| CA2323585A1 (en) | Adaptive reacquisition time in a slotted paging environment | |
| US6501735B1 (en) | Self-diagnostic method for detecting faults in a transceiver within a wireless receiving unit of a base transceiver station | |
| KR950009116A (en) | Automatic thawing method of microwave oven | |
| EP0324581A3 (en) | Calibration of vector demodulator using statistical analysis | |
| US4351031A (en) | Nondestructive testing system having automatic set-up means | |
| JPS6483434A (en) | Trouble shooting apparatus for vehicle controlling system | |
| WO1998000944A3 (en) | Test detection apparatus and method | |
| JPS6466578A (en) | Delay analysis system of logical circuit | |
| JP3166669B2 (en) | Received input level detection value correction circuit, correction method, and wireless transmission / reception device | |
| JPS646722A (en) | Detection system for automobile current position | |
| JPS5828218Y2 (en) | Voice noise measurement device | |
| US5359877A (en) | Method of defining an operating and a reset point for a limit value device | |
| JP2638876B2 (en) | Sensor controller and sensing method | |
| JPS62167434A (en) | Data reading method | |
| JPS57168531A (en) | Echo erasing device | |
| JPS5630368A (en) | Automatic control circuit for horizontal oscillation frequency | |
| JPH0330831B2 (en) | ||
| JP2002544490A (en) | A Method for Obtaining Intermediate Frequency Deviation Clearly in Frequency Controlled Radar Equipment | |
| JPS6454941A (en) | Control method for rds receiver | |
| JPH01280811A (en) | Automatic power factor controller | |
| JPS57125363A (en) | Test method of pll circuit | |
| JPH05273084A (en) | Method of inspecting parts having click feeling | |
| JPH0645877A (en) | Automatic tuning receiver |