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PN sequence identifying device in CDMA communication system

  • US 6,603,735 B1
  • Filed: 08/30/1999
  • Issued: 08/05/2003
  • Est. Priority Date: 08/29/1998
  • Status: Expired due to Term
First Claim
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1. In an asynchronous CDMA communication system, which transmits and receives first orthogonal Gold codes (OGCs) on a primary sync channel and second OGCs on a secondary sync channel synchronized with the primary sync channel symbol by symbol, comprising:

  • a transmitter, comprising;

    a PN sequence generating device for generating a PN sequence having one of the OGCs replaced with a null sign; and

    a receiver, comprising;

    a first OGC detector for detecting the first OGCs and obtaining a first symbol energy;

    a first synchronizer for receiving the first symbol energy, synchronizing chips, symbols, and slots, and outputting a first sync signal;

    a second OGC detector, upon reception of the first sync signal, detects the second OGCs each time the first sync signal is received, and obtaining second symbol energies in base station identifying group units;

    a hopping pattern generator for comparing the first symbol energy with the second symbol energies, determining whether null signs are in the second OGCs, determining the order of the null signs if the null signs are present, and generating a hopping pattern of the second OGCs;

    a second synchronizer for synchronizing frames based on the hopping pattern and outputting a second sync signal; and

    a PN sequence generator for receiving the first and second signals and the hopping pattern and generating a PN sequence.

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