Frequency expansion code testing method for byatt channel testing circuit, and ciruit thereof

Application Number: 00124755
Application Date: 2000.09.13
Publication Number: 1288308
Publication Date: 2001.03.21
Priority Information: 1999/9/14 JP 259705/1999
International: H04J13/00;H04Q7/34
Applicant(s) Name: NEC Corp.
Inventor(s) Name: Komeyama Tsune
Patent Agency Code: 11219
Patent Agent: mu dejun
Abstract To eliminate the need for timing control between base stations by means of a wide band CDMA system and to detect spreading codes, even if plural base stations overlap at detected spread timing. A spread timing detection part 11 detects spread timing from a perch channel and a correlation power value calculation part 12 calculates a correlation power value with respective to plural spreading code group candidates on the spread timing. A retrieval object judgment part 14 compares it with a threshold, which is previously ser in a threshold holding part. The plural spreading code group candidates whose correlation power values are larger than the threshold are judged and recoded. A spreading code/frame timing detection part 15 sequentially retrieves the codes by the plural spreading code candidates contained in a recorded spreading code group, detects the respective spreading codes, decides application and detects frame timing by the spreading code.