发明授权
- 专利标题: Path searched device and CDMA receiver with the same
- 专利标题(中): 路径搜索设备和CDMA接收机相同
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申请号: US09378265申请日: 1999-08-20
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公开(公告)号: US06487193B1公开(公告)日: 2002-11-26
- 发明人: Hajime Hamada , Yasuyuki Oishi , Kazuo Nagatani , Michiharu Nakamura , Koji Matsuyama
- 申请人: Hajime Hamada , Yasuyuki Oishi , Kazuo Nagatani , Michiharu Nakamura , Koji Matsuyama
- 优先权: JP10-251032 19980904
- 主分类号: H04B7216
- IPC分类号: H04B7216
摘要:
The present invention is directed to a path searching device and a CDMA receiver employing the same, having a reduced circuit scale and operating to carry out a smaller number of operations. For a direct spreading CDMA communication system, a CDMA receiver includes a reception demodulator including an antenna, a high-frequency amplifier a band-pass filter, demodulators, etc. The CDMA receiver also has despreading units, a determination unit, and a path search device. The path search device has a sampling unit for sampling an input signal by low-speed oversampling based on an integer multiple of a chip rate and by high-speed oversampling that is faster than the low-speed oversampling, a first circuit for finding a correlative value between a spreading code and a signal provided by the low-speed oversampling and finding timing corresponding to a maximum correlative value. A second circuit for finding despreading timing according to correlative values between a signal provided by the high-speed oversampling and a spreading code corresponding to the timing provided by the first circuit.
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