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US 6,856,797 B2Granted
Programmable radio receiver bandpass filter for cordless/wireless systems
AssigneeSiemens Communications, Inc.
InventorJuergen Kockmann
Life of this patent
Estimating the term…
Abstract
A programmable band-pass filter in a radio-frequency receiver. The band-pass filter has a bandwidth substantially covering a channel bandwidth. Once the appropriate channel in use is determined, the frequency band of the band-width filter is set to correspond to it.
Claims16
A telecommunications device, comprising:
- a receiver adapted to receive signals at a plurality of channels within one or more frequency bands;
- and
- a programmable filter adapted to bandpass filter said signals at individual ones of said channels, said receiver being a frequency hopping receiver and said programmable filter receiving a frequency select signal, said programmable filter adapted to select a channel for filtering responsive to said frequency select signal, said bandpass filter having a bandwidth sized to correspond to a channel bandwidth;
- wherein said frequency bands are divided into a plurality of subsets, each subset having a plurality of channels, and said frequency select signal indicates which channel in a particular subset is selected;
- and
- wherein a total number of frequencies are chosen to allow for avoiding interfering frequencies.
3 more elements
A telecommunications device, comprising:
- a receiver adapted to select one of a plurality of frequency channels;
- and
- a bandpass filter having a variable band corresponding to said one of said plurality of frequency channels, said receiver being a frequency hopping receiver and said bandpass filter receiving a frequency select signal, said bandpass filter adapted to select a channel for filtering responsive to said frequency select signal, said bandpass filter having a bandwidth sized to correspond to a channel bandwidth;
- wherein said frequency channels are selected from a plurality of frequency bands divided into a plurality of subsets, each subset having a plurality of channels, and said frequency select signal indicates which channel in a particular subset is selected wherein a total number of frequencies are chosen to allow for avoiding interfering frequencies.
1 more element
A telecommunications system, comprising:
- a base station;
- and
- a plurality of handsets;
- wherein each of said base station and handsets has a radio-frequency receiver adapted to receive signals at a plurality of channels within frequency bands and a programmable filter adapted to bandpass filter said signals at individual ones of said channels, said filter having a bandwidth sized to correspond to a channel bandwidth;
- wherein said frequency bands are divided into a plurality of subsets, each subset having a plurality of channels, and said frequency select signal indicates which channel in a particular subset is selected wherein a total number of frequencies are chosen to allow for avoiding interfering frequencies.
2 more elements
A telecommunications method, comprising:
- receiving a channel of a plurality of channels within a frequency band;
- and
- band-pass filtering said channel at an input to a radio-frequency receiver, said bandpass filtering comprising filtering with a bandwidth sized to correspond to a channel bandwidth;
- wherein said frequency channels are selected from a plurality of frequency bands divided into a plurality of subsets, each subset having a plurality of channels, and said frequency select signal indicates which channel in a particular subset is selected wherein a total number of frequencies are chosen to allow for avoiding interfering frequencies.
1 more element
A telecommunications method, comprising:
- providing a receiver adapted to select one of a plurality of frequency channels within a frequency band;
- and
- providing a bandpass filter having a variable band corresponding to said one of said plurality of frequency channels, said bandpass filter having a bandwidth sized to correspond to a channel bandwidth;
- wherein said frequency channels are selected from a plurality of frequency bands divided into a plurality of subsets, each subset having a plurality of channels, and said frequency select signal indicates which channel in a particular subset is selected wherein a total number of frequencies are chosen to allow for avoiding interfering frequencies.
1 more element
A telecommunications method comprising:
- a base station establishing a frequency hopping scheme;
- said base station providing information indicative of said scheme to a band pass filter;
- and
- said band pass filter filtering channels at frequencies of said frequency hopping scheme responsive to said information, wherein a bandwidth of said band pass filter is sized to correspond to a channel bandwidth;
- wherein said frequency channels are selected from a plurality of frequency bands divided into a plurality of subsets, each subset having a plurality of channels, and said frequency select signal indicates which channel in a particular subset is selected wherein a total number of frequencies are chosen to allow for avoiding interfering frequencies.
2 more elements
A telecommunications system, comprising:
- a base station adapted to establish a frequency hopping scheme and provide information indicative of said scheme to a band pass filter;
- wherein said band pass filter is adapted to filter channels at frequencies of said frequency hopping scheme responsive to said information, wherein a bandwidth of said band pass filter is sized to correspond to a channel bandwidth;
- wherein said frequency channels are selected from a plurality of frequency bands divided into a plurality of subsets, each subset having a plurality of channels, and said frequency select signal indicates which channel in a particular subset is selected wherein a total number of frequencies are chosen to allow for avoiding interfering frequencies.
Dependencies are inferred from the claim text.