CA2558849A1 - A system and method for excluding narrow band noise from a communication channel - Google Patents

A system and method for excluding narrow band noise from a communication channel Download PDF

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Publication number
CA2558849A1
CA2558849A1 CA002558849A CA2558849A CA2558849A1 CA 2558849 A1 CA2558849 A1 CA 2558849A1 CA 002558849 A CA002558849 A CA 002558849A CA 2558849 A CA2558849 A CA 2558849A CA 2558849 A1 CA2558849 A1 CA 2558849A1
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CA
Canada
Prior art keywords
signal
filtering
digital
filtering system
controller
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.)
Abandoned
Application number
CA002558849A
Other languages
French (fr)
Inventor
Abraham Hasarchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Axell Wireless Ltd
Original Assignee
Dekolink Wireless Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dekolink Wireless Ltd filed Critical Dekolink Wireless Ltd
Publication of CA2558849A1 publication Critical patent/CA2558849A1/en
Abandoned legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/71—Interference-related aspects the interference being narrowband interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
    • H04B7/15542—Selecting at relay station its transmit and receive resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15564—Relay station antennae loop interference reduction
    • H04B7/15578—Relay station antennae loop interference reduction by gain adjustment

Abstract

A signal filtering system and method that may be used in conjunction with a repeater or an input stage of a base-station. The system may include an analog to digital converter adapted to sample a received signal and to produce a data stream corresponding to the received signal in the time domain, a filtering block having one or more digital fitter elements, wherein each of said one or more filter elements is adapted to filter one or more sets of frequency bands associated with one or more communication channel, and a controller adapted to configure said one or more digital filter elements based on parameters stored on a database and/or based on parameters received via a modem.

Claims (35)

1. A signal filtering system comprising:
an analog to digital converter adapted to sample a received signal and to produce a data stream corresponding to the received signal in the time domain;
a digital signal processing unit to implement spectral analysis of said received signal;
a filtering sub-system to filter said data stream based on results of said spectral analysis, the filtering sub-system having one or more digital filter elements, each filtering element adapted to filter one or more sets of frequency bands associated with one or more, respective, communication channels; and a controller to configure said one or more digital filter elements based on one or more selected parameters
2 The signal filtering system according to claim 1, further comprising a down converter to down convert the received signal to an intermediate frequency prior to sampling by said analog to digital converter
3 The signal filtering system according to claim 1, further comprising a down converter to down convert the received signal to a desired radio frequency prior to sampling by said analog to digital converter.
4 The signal filtering system according to claim 1, further comprising a digital to analog converter to convert an output of said filtering block to an analog signal.
5 The signal filtering system according to claim 1, further comprising an up converter adapted to up convert an output from said digital to analog converter into an output radio frequency filter
6 The signal filtering system according to claim 1, wherein one or more of said filter elements include a programmable digital filter.
7. The signal filtering system according to claim 1, wherein one or more of said filter elements comprise a time domain to frequency domain conversion engine, a frame shaping unit, and a frequency domain to time domain conversion engine.
8. The signal filtering system according to claim 7, wherein said frequency domain conversion engine is a Fast Fourier Transform engine
9 The signal filtering system according to claim 7, wherein said frequency domain to time domain conversion engine is an inverse Fast Fourier Transform engine.
10 The signal filtering system according to claim 1, further comprising a performance monitoring unit to monitor signal flow characteristics through the system and to indicate the signal flow characteristics to said controller, wherein said controller is adapted to reconfigure said one or more filtering elements if the signal flow characteristics are not within predefined ranges
11 The signal filtering system according to claim 10, wherein the monitored signal flow characteristics include at least one parameter selected from the group consisting of signal gain, signal delay, and signal phase shift.
12 The signal filtering system according to claim 10, wherein said controller is able to transmit said signal flow characteristics to a remote location via said modem.
13. The signal filtering system according to claim 1, comprising a gain control unit adapted to remotely reconfigure said one or more filtering elements if the signal flow characteristics are not within predefined ranges
14 The signal filtering system according to claim 10, wherein said controller is adapted to automatically reconfigure said one or more filtering elements if the signal flow characteristics are not within predefined ranges.
15 The signal filtering system according to claim 10, wherein said controller is adapted to implement automatic gain control.
16 The signal filtering system according to claim 10, wherein said controller is adapted to automatically implement gain balancing.
17 The signal filtering system according to claim 10, wherein said controller is adapted to implement oscillation protection
18 The signal filtering system according to claim 10, wherein said controller is adapted to analyze a traffic load.
19 The signal filtering system according to claim 1, wherein one or more of said filter elements are configured to pass one or more selected frequency bands
20. The signal filtering system according to claim 1, wherein one or more of said filter elements are configured to block one or more selected frequency bands.
21 The signal filtering system according to claim 1, wherein one of more of said falter elements are configured to notch, at or around one or more selected frequency bands of an interference signal
22 A method of signal filtering comprising:
sampling a received signal and producing a data stream corresponding to the received signal in the time domain;
filtering said stream in accordance with one or more sets of frequency bands associated with one of more, respective, communication channels; and configuring said one or more communication channels based on one or more selected parameters
23 The method according to claim 30, further comprising down converting the received signal to an intermediate frequency prior to sampling by said analog to digital converter.
24 The method according to claim 30, further comprising converting an output of said filtering block into an analog signal
25 The method according to claim 32, further comprising up converting an output from said digital to analog converter into an output radio frequency filter
26 The method according to claim 30, wherein filtering comprises:
converting said data stream from said time domain to a frequency domain;
shaping a frame of said data stream; and converting the data stream back from said frequency domain to said time domain
27 The method according to claim 30, further comprising:
monitoring signal flow characteristics;
indicating the signal flow characteristics to said controller; and reconfiguring said one or more filtering elements if the signal flow characteristics are not within predefined ranges.
28. The method according to claim 35, wherein monitoring signal flow characteristics comprises:
gaming a signal;
delaying the signal; and shifting a phase of the signal
29 The method according to claim 35, where monitoring comprises transmitting the signal flow characteristics to a remote location via said modem
30 The method according to claim 22, further comprising implementing automatic gain setting.
31 The method according to claim 22, further comprising implementing automatic gain balancing.
32 The method according to claim 22, further comprising implementing oscillation control
33 The method according to claim 22, further comprising automatically analyzing a traffic load
34 A base station of a cellular communications system, said base station comprising:
an analog to digital converter adapted to sample a received signal and to produce a data stream corresponding to the received signal in the time domain;
a digital signal processing unit to implement spectral analysis of said received signal;
a filtering sub-system to filter said data stream, the filtering sub-system having one or more digital filter elements, each filtering element adapted to filter one or more sets of frequency hands associated with one or more, respective, communication channels; and a controller to configure said one or more digital filter elements based on one or more selected parameters
35 A repeater for a cellular communications system, said repeater comprising:
an analog to digital converter adapted to sample a received signal and to produce a data stream corresponding to the received signal in the time domain;

a digital signal processing unit to implement spectral analysis of said received signal;
a filtering sub-system to filter said data stream, the filtering sub-system having one or more digital filter elements, each filtering element adapted to filter one or more sets of frequency bands associated with one or more, respective, communication channels; and a controller to configure said one or more digital fitter elements based on one or more selected parameters
CA002558849A 2005-09-06 2006-09-06 A system and method for excluding narrow band noise from a communication channel Abandoned CA2558849A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/220,870 2005-09-06
US11/220,870 US7460831B2 (en) 2002-06-20 2005-09-06 System and method for excluding narrow band noise from a communication channel

Publications (1)

Publication Number Publication Date
CA2558849A1 true CA2558849A1 (en) 2007-03-06

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CA002558849A Abandoned CA2558849A1 (en) 2005-09-06 2006-09-06 A system and method for excluding narrow band noise from a communication channel

Country Status (6)

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US (1) US7460831B2 (en)
EP (1) EP1760902A3 (en)
KR (1) KR101336351B1 (en)
CN (1) CN1972153A (en)
CA (1) CA2558849A1 (en)
IL (1) IL177926A (en)

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EP1760902A3 (en) 2011-06-22
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