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Apparatus for establishing communication between a first radio transmitter and receiver and a second radio transmitter and receiver

  • US 4,001,693 A
  • Filed: 05/12/1975
  • Issued: 01/04/1977
  • Est. Priority Date: 05/12/1975
  • Status: Expired due to Term
First Claim
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1. For use in a radio communication system having at least a base station transmitter and receiver at one location and a mobile station transmitter and receiver at a second location, function control apparatus for establishing communication between said stations comprising:

  • a. means for for producing outbound messages having a sequence of binary bits at a first rate, each outbound message comprising a first synchronizing word of S bits, where S is an integer greater than two, a first address word, a second synchronizing word of S bits that is the binary inversion of said first synchronizing word, a second address word, a third synchronizing word of S bits that is the binary inversion of said first synchronizing word, and a command word;

    b. means connected to said outbound message producing means and for connection to said base station transmitter for supplying said outbound messages thereto;

    c. means for connection to said mobile station receiver for deriving said outbound messages transmitted by said base station transmitter and received by said mobile station receiver;

    d. synchronizing means connected to said deriving means of said mobile station receiver for producing an in-synchronization signal in response to said first synchronizing word and said second synchronizing word of said received outbound messages each having a respective predetermined sequence of binary values and for producing an out-of-synchronization signal in response to a predetermined plurality of sequential synchronizing words of said received outbound messages each having a sequence of binary values that is different from its respective predetermined sequence of binary values;

    e. means connected to said synchronizing means of said mobile station and connected to said deriving means of said mobile station for producing an inbound message in response to said in-synchronization signal and in response to said first and second address words of an outbound message having a predetermined sequence of binary values, said inbound message having a sequence of binary bits at a second rate that is greater than said first rate of said binary bits of said outbound messages, each inbound message comprising a synchronizing preamble, said first synchronizing word of S bits, said first address word, said second synchronizing word of S bits, said second address word, said third synchronizing word of S bits, and a response word;

    f. means connected to said inbound message producing means and for connection to said mobile station transmitter for applying said inbound message thereto;

    g. means for connection to said base station receiver for deriving an inbound message transmitted by said mobile station transmitter and received by said base station receiver;

    h. synchronizing means connected to said deriving means of said base station for determining the binary values of each group of N equally spaced bits in said synchronizing words of said inbound message, where N is an integer greater than two, and S/N is an integer greater than one;

    producing a bit representing the majority binary value of said N bits of each of said groups; and

    producing an in-synchronization signal in response to said representative bits having a predetermined sequence of binary values;

    i. and utilizing means connected to said synchronizing means of said base station for utilizing said derived inbound message in response to said in-synchronization signal produced by said synchronizing means of said base station.

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