Channel selective repeater
First Claim
1. A repeater for improving the transmitting and receiving performance in radio communication between a subscriber terminal and a base station in parts of a cell in a cellular telecommunication system, said repeater comprising, in a first of two fundamentally alike branches, whereof one is intended for communication from the base station to the subscriber terminal and one for communication in the other direction,a radiator means for incoming and outgoing signals connected toa duplex means, which also has a connection for said outgoing signals and a connection for said incoming signals, the connection for said incoming signals being connected toa multicoupler, which is connected, via at least one of its outputs, to an input of a channel selecting means, which includeson the input, a first mixer connected toa filter for channel selection connected toa second mixer connected to the output of the channel selecting means, anda combiner connected via one of its inputs to the output of the channel selecting means,the output of said combiner being connected in turn to the connection of the duplex means for outgoing signals in the second branch, wherein power amplifying means are arranged for amplifying said outgoing signals in each branch, characterized inthat, in the first and the second branch, a power amplifier is arranged between said channel selecting means and the associated input of the combiner, whereas no amplifying means is provided between the combiner and the associated radiator means;
- that said first and second mixers are connected to a common mixing frequency generator, wherein said power amplifier is arranged to amplify and transfer the carrier frequency of the incoming signals, which have been transposed a certain frequency range by the first mixer, transferred by the filter, and transposed back the same frequency range by the second mixer, so that corresponding incoming signals and outgoing signals have the same frequency; and
that filter means are arranged between the power amplifier and the combiner in order to suppress intermodulation products unwanted in the radio communication and/or unwanted interaction between RF signals transferred by the different channel selecting means,whereby it is achieved in the repeater a high efficiency, simple design and low internal generation of disturbing intermodulation products for the radio communication between the subscriber terminal and the base station.
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Accused Products
Abstract
An improved repeater for receiving and re-transmitting radio signals for a cell in a cellular telecommunication system. The repeater raises the levels and is capable of converting the frequencies of the radio signals used in the telecommunication system. Due to the power amplifiers being provided between the channel selecting means and combiner, the power amplifier needs only to amplify one frequency band. In this way the repeater gets a simpler design, demands less maintenance, and gets a higher degree of efficiency in combination of high power capacity and generation of low levels only of intermodulation products.
62 Citations
14 Claims
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1. A repeater for improving the transmitting and receiving performance in radio communication between a subscriber terminal and a base station in parts of a cell in a cellular telecommunication system, said repeater comprising, in a first of two fundamentally alike branches, whereof one is intended for communication from the base station to the subscriber terminal and one for communication in the other direction,
a radiator means for incoming and outgoing signals connected to a duplex means, which also has a connection for said outgoing signals and a connection for said incoming signals, the connection for said incoming signals being connected to a multicoupler, which is connected, via at least one of its outputs, to an input of a channel selecting means, which includes on the input, a first mixer connected to a filter for channel selection connected to a second mixer connected to the output of the channel selecting means, and a combiner connected via one of its inputs to the output of the channel selecting means, the output of said combiner being connected in turn to the connection of the duplex means for outgoing signals in the second branch, wherein power amplifying means are arranged for amplifying said outgoing signals in each branch, characterized in that, in the first and the second branch, a power amplifier is arranged between said channel selecting means and the associated input of the combiner, whereas no amplifying means is provided between the combiner and the associated radiator means; -
that said first and second mixers are connected to a common mixing frequency generator, wherein said power amplifier is arranged to amplify and transfer the carrier frequency of the incoming signals, which have been transposed a certain frequency range by the first mixer, transferred by the filter, and transposed back the same frequency range by the second mixer, so that corresponding incoming signals and outgoing signals have the same frequency; and that filter means are arranged between the power amplifier and the combiner in order to suppress intermodulation products unwanted in the radio communication and/or unwanted interaction between RF signals transferred by the different channel selecting means, whereby it is achieved in the repeater a high efficiency, simple design and low internal generation of disturbing intermodulation products for the radio communication between the subscriber terminal and the base station. - View Dependent Claims (2, 3)
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4. A repeater for improving the transmitting and receiving performance in radio communication between a subscriber terminal and a base station in parts of a cell in a cellular telecommunication system, said repeater comprising, in a first of two fundamentally alike branches, whereof one is intended for communication from the base station to the subscriber terminal and one for communication in the other direction,
a radiator means for incoming and outgoing signals connected to a duplex means, which also has a connection for said outgoing signals and a connection for said incoming signals, the connection for said incoming signals being connected to a multicoupler, which is connected partly, via at least one of its outputs, to the input of a channel selecting means, which includes at the input a first mixer connected to a filter for channel selection connected to a second mixer connected to the output of the channel selecting means, partly, via at least a second one of its outputs, to the input of a band selecting means, which includes at the input a third mixer connected to a filter for band selection connected to a fourth mixer connected to the output of the band selecting means, and a combiner connected, via a first and a second of its inputs, respectively, to the channel selecting means, and to the output of the band selecting means, respectively, the output of said combiner in turn is connected to a connection of the duplex means for outgoing signals in the second branch, wherein power amplifying means are arranged for amplifying said outgoing signals in each branch, characterized in that, in the first and the second branch, a first power amplifier is provided between said channel selecting means and the first input of the combiner, and a linear, second power amplifier is provided between the band selecting means and the second input of the combiner, whereas no amplifying means is provided between the combiner and the associated radiator means; -
that the said first and second mixers are connected to a common first mixing frequency generator, wherein said first power amplifier is arranged to amplify and transfer the carrier frequency of the incoming signals, which have been transposed a certain frequency range by the first mixer, transferred by the filter, and transposed back the same frequency range by the second mixer, and that the said third and fourth mixers are connected to a common second mixing frequency generator, wherein said second power amplifier is arranged to amplify and transfer the carrier frequency of the incoming signals, which have been transposed a certain frequency range by the third mixer, transferred by the filter, and transposed back the same frequency range by the fourth mixer, so that corresponding incoming signals and outgoing signals have the same frequency; and that filter means are arranged between the first power amplifier and the first input of the combiner, and between the second power amplifier and the second input of the combiner, in order to suppress intermodulation products unwanted in the radio communication and/or unwanted interaction between RF signals transferred by the different channel selecting means, whereby it is achieved in the repeater a high efficiency, simple design and low internal generation of disturbing intermodulation products for the radio communication between the subscriber terminal and the base station. - View Dependent Claims (5, 6)
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7. A repeater for improving the transmitting and receiving performance in radio communication between a subscriber terminal and a base station in parts of a cell in a cellular telecommunication system, said repeater comprising, in a first of two fundamentally alike branches, whereof one is intended for communication from the base station to the subscriber terminal and one for communication in the other direction,
a radiator means for incoming and outgoing signals connected to a duplex means, which also has a connection for said outgoing signals and a connection for said incoming signals, the connection for said incoming signals being connected to a multicoupler, which is connected, via at least one of its outputs, to an input of a channel selecting means, which includes on the input, a first mixer connected to a filter for channel selection connected to a second mixer connected to the output of the channel selecting means, and a combiner connected via one of its inputs to the output of the channel selecting means, the output of said combiner being connected in turn to the connection of the duplex means for outgoing signals in the second branch, wherein power amplifying means are arranged for amplifying said outgoing signals in each branch, characterized in that, in the first and the second branch, a power amplifier is arranged between said channel selecting means and the associated input of the combiner, whereas no amplifying means is provided between the combiner and the associated radiator means; -
that said first and second mixers are connected to a common mixing frequency generator, wherein said power amplifier is arranged to amplify and transfer the carrier frequency of the incoming signals, which have been transposed a certain frequency range by the first mixer, transferred by the filter, and transposed back the same frequency range by the second mixer, so that corresponding incoming signals and outgoing signals have the same frequency; and that circulator means are provided between the power amplifier and the combiner for suppressing intermodulation products unwanted to the radio communication and/or unwanted interaction between RF signals transferred by the channel selecting means, whereby it is achieved in the repeater a high efficiency, simple design and low internal generation of disturbing intermodulation products for the radio communication between the subscriber terminal and the base station. - View Dependent Claims (8, 9)
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10. A repeater for improving the transmitting and receiving performance in radio communication between a subscriber terminal and a base station in parts of a cell in a cellular telecommunication system, said repeater comprising, in a first of two fundamentally alike branches, whereof one is intended for communication from the base station to the subscriber terminal and one for communication in the other direction,
a radiator means for incoming and outgoing signals connected to a duplex means, which also has a connection for said outgoing signals and a connection for said incoming signals, the connection for said incoming signals being connected to a multicoupler, which is connected partly, via at least one of its outputs, to the input of a channel selecting means, which includes at the input a first mixer connected to a filter for channel selection connected to a second mixer connected to the output of the channel selecting means, partly, via at least a second one of its outputs, to the input of a band selecting means, which includes at the input a third mixer connected to a filter for band selection connected to a fourth mixer connected to the output of the band selecting means, and a combiner connected, via a first and a second of its inputs, respectively, to the channel selecting means, and to the output of the band selecting means, respectively, the output of said combiner in turn is connected to a connection of the duplex means for outgoing signals in the second branch, wherein power amplifying means are arranged for amplifying said outgoing signals in each branch, characterized in that, in the first and the second branch, a first power amplifier is provided between said channel selecting means and the first input of the combiner, and a linear, second power amplifier is provided between the band selecting means and the second input of the combiner, whereas no amplifying means is provided between the combiner and the associated radiator means; -
that the said first and second mixers are connected to a common first mixing frequency generator, wherein said first power amplifier is arranged to amplify and transfer the carrier frequency of the incoming signals, which have been transposed a certain frequency range by the first mixer, transferred by the filter, and transposed back the same frequency range by the second mixer, and that the said third and fourth mixers are connected to a common second mixing frequency generator, wherein said second power amplifier is arranged to amplify and transfer the carrier frequency of the incoming signals, which have been transposed a certain frequency range by the third mixer, transferred by the filter, and transposed back the same frequency range by the fourth mixer, so that corresponding incoming signals and outgoing signals have the same frequency; and that circulator means are provided between the first power amplifier and the first input of the combiner, and between the second power amplifier and the second input of the combiner, for suppressing intermodulation products unwanted to the radio communication and/or unwanted interaction between RF signals transferred by the channel selecting means, whereby it is achieved in the repeater a high efficiency, simple design and low internal generation of disturbing intermodulation products for the radio communication between the subscriber terminal and the base station. - View Dependent Claims (11, 12)
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13. A repeater for improving the transmitting and receiving performance in radio communication between a subscriber terminal and a base station in parts of a cell in a cellular telecommunication system, said repeater comprising, in a first of two fundamentally alike branches, whereof one is intended for communication from the base station to the subscriber terminal and one for communication in the other direction,
a radiator means for incoming and outgoing signals connected to a duplex means, which also has a connection for said outgoing signals and a connection for said incoming signals, the connection for said incoming signals being connected to a multicoupler, which is connected, via at least one of its outputs, to an input of a channel selecting means, which includes on the input, a first mixer connected to a filter for channel selection connected to a second mixer connected to the output of the channel selecting means, a frequency generator generating a signal to the first and the second mixers, and a combiner connected via one of its inputs to the output of the channel selecting means, the output of said combiner being connected in turn to the connection of the duplex means for outgoing signals in the second branch, wherein power amplifying means are arranged for amplifying said outgoing signals in each branch, characterized in that, in the first and the second branch, a power amplifier is arranged between said channel selecting means and the associated input of the combiner, that filter or circulator means are arranged between the power amplifier and the combiner in order to suppress intermodulation products unwanted in the radio communication and/or unwanted interaction between RF signals transferred by the different channel selecting means, whereby it is achieved in the repeater a high efficiency, simple design and low internal generation of disturbing intermodulation products for the radio communication between the subscriber terminal and the base station.
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14. A repeater for improving the transmitting and receiving performance in radio communication between a subscriber terminal and a base station in parts of a cell in a cellular telecommunication system, said repeater comprising, in a first of two fundamentally alike branches, whereof one is intended for communication from the base station to the subscriber terminal and one for communication in the other direction,
a radiator means for incoming and outgoing signals connected to a duplex means, which also has a connection for said outgoing signals and a connection for said incoming signals, the connection for said incoming signals being connected to a multicoupler, which is connected partly, via at least one of its outputs, to the input of a channel selecting means, which includes at the input a first mixer connected to a filter for channel selection connected to a second mixer connected to the output of the channel selecting means, a first frequency generator generating a signal to the first and the second mixers, partly, via at least a second one of its outputs, to the input of a band selecting means, which includes a combiner connected, via a first and a second of its inputs, respectively, to the channel selecting means, and to the output of the band selecting means, respectively, the output of said combiner in turn is connected to a connection of the duplex means for outgoing signals in the second branch, wherein power amplifying means are arranged for amplifying said outgoing signals in each branch, characterized in that, in the first and the second branch, a first power amplifier is provided between said channel selecting means and the first input of the combiner, and a linear, second power amplifier is provided between the band selecting means and the second input of the combiner, that filter means are arranged between the first power amplifier and the first input of the combiner, and between the second power amplifier and the second input of the combiner, in order to suppress intermodulation products unwanted in the radio communication and/or unwanted interaction between RF signals transferred by the different channel selecting means, whereby it is achieved in the repeater a high efficiency, simple design and low internal generation of disturbing intermodulation products for the radio communication between the subscriber terminal and the base station.
Specification