Radio base station receiver having digital filtering and reduced sampling frequency
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Accused Products
Abstract
A station for processing a first signal which can be generated by a mobile terminal and belongs to a plurality of signals for mobile radio communications networks. The stations include an input able to receive from an antenna the first signal associated with a first band and at least one adjacent signal of said plurality associated with a second band adjacent to that of the first signal; a processing stage for generating from the first digital signal at a first sampling frequency, this first digital signal including a useful spectral content of the first signal and an interfering spectral content associated with the adjacent signal; a digital filter for processing the first digital signal, attenuating the interfering spectral content, and for providing a filtered digital signal including at least part of the useful special content sampled at a second sampling frequency less than the first sampling frequency and an electro-optical converter for generating from the filtered digital signal electromagnetic radiation to be transmitted on a waveguide.
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Citations
48 Claims
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1-24. -24. (canceled)
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25. A station for processing a first signal which can be generated by a mobile terminal and belongs to a plurality of signals for mobile radio communications networks, comprising:
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an input able to receive from an antenna the first signal associated with a first band and at least one adjacent signal of said plurality associated with a second band adjacent to that of the first signal;
a processing stage for generating from the first signal and from the at least one adjacent signal a first digital signal at a first sampling frequency, this first digital signal including a useful spectral content of the first signal and an interfering spectral content associated with said adjacent signal;
a digital filter for processing the first digital signal, attenuating the interfering spectral content, and for providing a filtered digital signal including at least part of said useful spectral content; and
a converter for generating from said filtered digital signal electromagnetic radiation to be transmitted on a waveguide. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method for processing a first signal which can be generated by a mobile terminal and belongs to a plurality of signals for mobile radio communications networks comprising the steps of:
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receiving the first signal and second signals of said plurality including at least one signal adjacent to the first signal and interfering with the latter;
performing analog filtering of a first electrical signal corresponding to said first signal and to said second signals in order to eliminate the signals of said plurality which are non-adjacent to the first signal and transmit a second electrical signal having a useful spectral content associated with the first signal and an interfering spectral content associated with the adjacent signal;
converting from analog to digital the filtered first electrical signal so as to generate a digital signal, said conversion occurring at a first sampling frequency and defining a first transmission rate of said first digital signal;
performing digital filtering of the first digital signal in order to eliminate substantially the interfering spectral content and provide a first filtered digital signal including said useful spectral content; and
reducing the sampling frequency of said first filtered digital signal so as to obtain a second filtered digital signal to be sent on a first output bus and having a second transmission rate less than the first transmission rate. - View Dependent Claims (36, 37, 38)
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39. A mobile radio communications network comprising:
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a main control center of the network for managing a plurality of signals;
a station for processing said signals controlled by said main control center, the processing station being provided with a port for receiving/transmitting electromagnetic radiation;
a waveguide having a first end connected to said output port; and
at least one antenna station for processing a first signal which can be generated by a mobile terminal and belongs to the plurality of signals, said station being connected to a second end of the waveguide and comprising;
an input able to receive from an antenna the first signal associated with a first band and at least one adjacent signal of said plurality associated with a second band adjacent to that of the first signal;
a processing state for generating from the first signal and from at least one adjacent signal a first digital signal at a first sampling frequency, this first digital signal including a useful spectral content of the first signal and an interfering spectral content associated with said adjacent signal;
a digital filter for processing the first digital signal, attenuating the interfering spectral content, and for providing a filtered digital signal including at least part of said useful spectral content; and
a converter for generating from said filtered digital signal electromagnetic radiation to be transmitted to the processing station by means of the waveguide. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48)
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Specification