Orthogonal code synchronization system and method for spread spectrum CDMA communications

Orthogonal code synchronization system and method for spread spectrum CDMA communications

  • CN 1,878,042 B
  • Filed: 02/26/1998
  • Issued: 06/19/2013
  • Est. Priority Date: 02/28/1997
  • Status: Active Grant
First Claim
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1. one kind is used for the geographically wireless code division multiple address system of localisation of mobile terminals, and described system comprises:

  • A plurality of base stations with fixed position, each base station comprises;

    Transmitter is arranged to emission the first spread-spectrum signal, and described the first spread-spectrum signal has relevant base station pilot reference signal;

    Receiver is arranged to and receives the second spread-spectrum signal, and described the second spread-spectrum signal has the associated remote ends pilot signal;

    Transmitter is arranged to output and shows the lock-on signal that described the first spread-spectrum signal is synchronizeed with described the second spread-spectrum signal;

    Wherein each base station is arranged to and separates and postpone described base station pilot reference signal to produce punctual signal, the anticipating signal of base station pilot reference signal and the delay signal of base station pilot reference signal of base station pilot reference signal, and punctual signal, anticipating signal and the delay signal of this base station pilot reference signal is for punctual signal, anticipating signal and the delay signal of the described far-end pilot signal of being correlated with out respectively;

    Wherein said each base station is arranged to by decide the distance between described mobile terminal and described base station in response to the code phase difference between described lock-on signal described the first spread-spectrum signal of measurement and described the second spread-spectrum signal;

    AndThis transmitter also is arranged to this distance of emission to this mobile terminal;

    AndDescribed mobile terminal comprises;

    Receiver is arranged to from described base station and receives described the first spread-spectrum signal;

    Transmitter, be arranged to described the second spread-spectrum signal of emission, the associated remote ends pilot signal of described the second spread-spectrum signal and the synchronization on sequential of described the first spread-spectrum signal, the associated remote ends pilot signal of wherein said the second spread-spectrum signal is via the relevant base station pilot reference signal that utilizes described the first spread-spectrum signal to the synchronization of described the first spread-spectrum signal;

    Wherein the receiver of this mobile terminal also is arranged to the described distance of at least one base station reception from described base station;

    AndWherein the transmitter of this mobile terminal also is arranged to emission the 3rd spread-spectrum signal, and described the 3rd spread-spectrum signal has this distance of response and the sequential of adjustment, and wherein said the 3rd spread-spectrum signal comprises Deta bearer channel and pilot tone Bearer Channel.

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