CDMA radio communication apparatus

{
  "publication_number": "US6370134B1",
  "country": "US",
  "kind": "B1",
  "title": "CDMA radio communication apparatus",
  "abstract": "A transmission side transmits a frame in which a masked symbol spread with a common short code to all base stations is prepared at equal intervals and a symbol spread with a long code group identification is multiplexed in the masked symbol according to the predetermined pattern. A reception side detects a pattern of the multiplexed symbol in pattern detecting section 113 as detecting a long code identification short code to acquire a long code phase. Based on the long code phase, a long code included in a long code group is searched.",
  "claims": [
    "1. A CDMA radio communication apparatus, comprising: a first detector that detects a timing of a masked symbol used in a cell search using long code masking; a first identifier that identifies a long code group at a detected timing; a second detector that detects a long phase using pattern data concerning a masked symbol; and a second identifier that identifies a long code using said identified long code group.",
    "2. The CDMA radio communication apparatus of claim 1, wherein said pattern data comprises correlation pattern data.",
    "3. The CDMA radio communication apparatus of claim 1, wherein said pattern data comprises pattern data of long code phase information spread in said masked symbol.",
    "4. The CDMA radio communication apparatus of claim 1, wherein said masked symbol comprises a multiplexed symbol of a symbol spread with a different short code.",
    "5. A CDMA radio communication apparatus, comprising: a detecting device that detects a timing of a masked symbol used in a cell search using long code masking; and an identifying device that identifies a long code by detecting a long code phase using pattern data concerning said masked symbol.",
    "6. The CDMA radio communication apparatus of claim 5, wherein said data pattern comprises pattern data of a position in a slot where a symbol spread with a different short code is present.",
    "7. A CDMA radio communication apparatus, comprising: a detector that detects a timing of a masked symbol used in a cell search using long code masking; and a detector that detects a long code phase and a sort of a long code, while identifying a long code group using pattern data concerning said masked symbol.",
    "8. A CDMA radio communication apparatus, comprising: means for detecting a timing of a masked symbol used in a cell search using long code masking; means for identifying a long code group at said detected timing; means for detecting a long code phase in said identified long code group; and means for identifying a long code using said identified long code group, wherein said means for identifying a long code group includes a memory that stores masked symbol data.",
    "9. A CDMA radio communication apparatus, comprising: means for detecting a long code phase using a positional relationship of masked symbols used in a cell search using long code masking; and means for identifying a long code using an identified long code group, wherein each of a plurality of masked symbols are each spread with a different short code present at a different position in a slot.",
    "10. A CDMA radio communication system, comprising: a transmitting device that prepares a first masked symbol spread in a long code with only a short code common to all base stations at an equal interval in a slot, and multiplexing a second masked symbol in a long code spread with only a long code group identifying a short code in said first masked symbol, according to a predetermined pattern to transmit; a first acquiring device that acquires a first correlation by detecting a correlation of a received signal and said common short code to all base stations; a detector that detects a timing of said first masked symbol by detecting a maximum value of said first correlation; a second acquiring device that acquires a second correlation by detecting a correlation of said second masked symbol and each of candidates of long code group identification short codes sequentially; a third acquiring device that acquires a long code group by identifying a candidate with a maximum value of said second correlation as a long code group identification short code, while acquiring a long code phase by detecting a head position of a long code using a correlation pattern of said second masked symbol and said long code group identification short code; a fourth acquiring device that acquires a third correlation by detecting a correlation of a received signal and a long code included in said long code group using said long code phase; and an identifying device that identifies a long code corresponding to said third correlation exceeding a threshold value calculated from said maximum value of said first correlation as a long code for a base station transmitting said received signal.",
    "11. A CDMA radio communication system, comprising: a transmitter that prepares a first masked symbol in a long code spread with a common short code to all base stations at an equal interval in a slot, and prepares a second masked symbol in a long code spread with a long code group identification short code at a position of a prescribed number of symbols after said first masked symbol according to a predetermined pattern to transmit; a first acquiring device that acquires a first correlation by detecting a correlation of a received signal and said common short code to all base stations; a detector that detects a timing of said first masked symbol by detecting a maximum value of said first correlation; a second acquiring device that acquires a second correlation by sequentially detecting a correlation of said second masked symbol and each candidate of long code group identification short codes; a third acquiring device that acquires a long code group by identifying a candidate with a maximum second correlation as a long code group identification short code, while detecting a long code phase by detecting a head position of a long code using a correlation pattern of said second masked symbol and said long code group identification short code; a fourth acquiring device that acquires a third correlation by detecting said correlation of said received signal and a long code included in said long code group using said long code phase; and an identifying device that identifies a long code corresponding to said third correlation exceeding a threshold value calculated from said maximum value of said first correlation as a long code for a base station transmitting said received signal.",
    "12. The CDMA radio communication system according of claim 10, further comprising: an assigning device that assigns long code phase information to said first masked symbol to spread with said common short code to all base stations; a fifth acquiring device that acquires demodulated data by demodulating said first masked symbol with said common short code to all base stations; and a detecting device that detects a long code phase using a pattern of said demodulated data.",
    "13. The CDMA radio communication system of claim 10, further comprising: an assigning device that assigns long code phase information to said second masked symbol to spread with a long code group identification short code; a fifth acquiring device that acquires demodulated data by demodulating said second masked symbol with said long code group identification short code; and a detecting device that detects a long code phase using a pattern of said demodulated data.",
    "14. The CDMA radio communication system of claim 10, further comprising: an assigning device that assigns long code phase information to said first masked symbol to spread with said common short code to all base stations, and assigns said long code phase information to said second masked symbol to spread with said long code identification short code; a fifth acquiring device that acquires a first demodulated data by demodulating said first masked symbol with said common short code to all base station; a sixth acquiring device that acquires a second demodulated data by demodulating said second masked symbol with said long code identification short code; and a detecting device that detects a long code phase using both of a pattern of said first demodulated data and a pattern of said second demodulated data.",
    "15. The CDMA radio communication system of claim 10, further comprising: a buffer memory that stores data of said second masked symbol; and a detecting device that detects said correlation of said second masked symbol stored in said buffer memory and said long code group identification short code in time division.",
    "16. A CDMA radio communication system, comprising: means for assigning a long code group identification data to a masked symbol in a long code to spread with a common short code to all base stations; means for detecting a timing of said masked symbol using a maximum correlation of a received signal and said common short code to all base stations; means for demodulating said masked symbol with said common short code to all base stations, capturing said long code group identification data from said masked symbol, and determining a long code group and a long code phase using a pattern of said long code group identification data; and means for sequentially detecting a correlation of said received signal and each of said long codes included in said long code group, and identifying a long code in which a correlation exceeds a threshold value calculated from said common short code to all base stations as a long code for a base station transmitting said received signal.",
    "17. A CDMA radio communication system, comprising: means for transmitting a frame, in which a first masked symbol in a long code spread with only a first common short code to all base stations and a second masked symbol in a long code spread with a second common short code to all base stations are prepared at different positions located at an equal interval in said frame; means for detecting a correlation of a received signal and said first common short code to all base stations using one of a matched filter and a sliding correlator, and detecting a timing of said first masked symbol using a maximum correlation; means for detecting said maximum correlation of said received signal and said second common short code to all base stations, and determining a long code group using a relationship of positions corresponding to said maximum correlation of each of said first common short code to all base stations and said second common short code to all base stations; and means for detecting said correlation of said received signal and each of candidates of said long code group by sequentially shifting a phase, and identifying a long code in which said correlation exceeds a threshold value obtained based on said correlation of said common short code to all base stations as a long code for a base station transmitting said received signal.",
    "18. The CDMA radio communication system of claim 17, further comprising: means for assigning long code phase information to said first masked symbol to be spread with only a first common short code to all base stations, and assigning long code phase information to said second masked symbol to be spread with only a second common short code to all base stations; means for detecting a long code phase using the information demodulated from said first masked symbol and the information demodulated from said second masked symbol; and means for detecting a correlation of said received signal and each of candidates of said long code group using said long code phase sequentially, and identifying a long code with said correlation exceeding a threshold value obtained based on a correlation of said common short code to all base stations as a long code for a base station transmitting said received signal.",
    "19. The CDMA radio communication system of claim 17, further comprising: means for assigning long code sort information to said first masked symbol to be spread with only said first common short code to all base stations, and assigning said long code sort information to said second masked symbol to be spread with only said second common short code to all base stations; means for demodulating said first masked symbol and said second masked symbol with said common short codes to all base stations, capturing said long code sort information, and determining a long code phase using a pattern of said long code sort information; and means for deciding a sort of long code using said long code group information and said long code sort information."
  ],
  "cpc": [
    "H04B 1/7093",
    "H04B 1/707",
    "H04B 1/70735",
    "H04B 1/7077",
    "H04B 1/7083",
    "H04B 2201/70701",
    "H04B 2201/70707",
    "H04J 13/00"
  ],
  "assignees": [
    "MATSUSHITA ELECTRIC INDUSTRIAL CO LTD"
  ],
  "filing_date": "1998-07-15",
  "publication_date": "2002-04-09",
  "grant_date": "2002-04-09",
  "priority_date": "1997-07-17",
  "application_number": "US-11550298-A",
  "family_id": "16539235",
  "citations": [
    "US6167037A"
  ]
}