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Spread spectrum communication apparatus

  • US 5,737,329 A
  • Filed: 04/12/1996
  • Issued: 04/07/1998
  • Est. Priority Date: 04/14/1995
  • Status: Expired due to Fees
First Claim
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1. A spread spectrum communication apparatus, comprising:

  • a first transmitter-receiver having;

    a receiver block for receiving a transmission signal which is spread spectrum modulated using a first PN code, carrying out a spread spectrum demodulation by synchronizing the received signal with a phase of the first PN code, determining whether the spread spectrum demodulated signal has synchronized with the phase of the first PN code, and then outputting a synchronization detection signal;

    a control signal generator for generating a control signal for shifting the phase of the first PN code for spread spectrum modulation in a second transmitter-receiver so as to establish synchronization of signals received in the receiver block of the first transmitter-receiver based on the synchronization detection signal; and

    a transmitter block for transmitting to the second transmitter-receiver an information signal which is multiplexed with the control signal and spread spectrum modulated using a second PN code;

    the second transmitter-receiver having;

    a receiver block for receiving the transmission signal which is spread spectrum modulated in the first transmitter-receiver with the first PN code, performing a reverse spread spectrum process on the signal received by the receiver block in the second transmitter-receiver by synchronizing the phase of the received signal using the second PN code, demodulating the received signal, separating the control signal from the received signal and outputting control signal;

    a phase controller for generating a phase control signal that shifts the phase of the first PN code for spread spectrum processing to establish a reception synchronization of the first transmitter-receiver, which can not establish the reception synchronization based on the control signal separated from the receiver block;

    a transmitter block for transmitting an information signal for transmission by performing spread spectrum processing using the first PN code which is generated by a clock pulse synchronizing the phase of the first PN code with the spread spectrum demodulator of the receiver block; and

    a phase shifter connected between the receiver block and the transmitter block of the second transmitter-receiver for shifting the phase of the first PN code based on the phase control signal from the phase controller in the second transmitter-receiver so as to establish the reception synchronization of the first transmitter-receiver.

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