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Channel selective repeater

  • US 5,809,398 A
  • Filed: 05/14/1996
  • Issued: 09/15/1998
  • Est. Priority Date: 05/11/1994
  • Status: Expired due to Term
First Claim
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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 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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