Title:
CDMA通信システムにおいてパイロット信号を取得および追跡する方法及び装置
Document Type and Number:
Japanese Patent JP4263596
Kind Code:
B2
Abstract:
Techniques to acquire and track pilots in a CDMA system. In an aspect, frequency acquisition of a number of signal instances (i.e., multipaths) in a received signal may be achieved concurrently based on a frequency control loop (RAFC) maintained for each finger processor of a rake receiver. Upon successful acquisition, frequency tracking of acquired multipaths may be achieved based on a combination of a frequency control loop (VAFC) maintained for an oscillator used for downconverting the received signal and the RAFCs for the finger processors. In a tracking mode, the VAFC tracks the average frequency of the acquired multipaths by adjusting the frequency of the oscillator. The RAFC of each finger processor tracks the residual frequency error (e.g., due to Doppler frequency shift) of the individual acquired multipath by adjusting the frequency of a complex sinusoidal signal used in a rotator within the finger processor.
Inventors:
Challa, Ragu
Sea, Gilbert Christopher
Sea, Gilbert Christopher
Application Number:
JP2003514773A
Publication Date:
May 13, 2009
Filing Date:
July 16, 2002
Export Citation:
Assignee:
QUALCOMM INCORPORATED
International Classes:
H04L27/00
Domestic Patent References:
| JP2001016120A | ||||
| JP7115387A | ||||
| JP10126401A | ||||
| JP6338784A | ||||
| JP2003523125A | ||||
| JP2000106535A | ||||
| JP7087145A | ||||
| JP7123024A |
Foreign References:
| WO2000038343A1 | ||||
| US5640431 |
Attorney, Agent or Firm:
Takehiko Suzue
Kurata Masatoshi
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Kocho Chojiro
Naoki Kono
Katsu Sunagawa
Tetsuya Kazama
Katsumura Hiro
Shoji Kawai
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Takenori Masanori
Takuzo Ichihara
Yamashita Gen
Kurata Masatoshi
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Kocho Chojiro
Naoki Kono
Katsu Sunagawa
Tetsuya Kazama
Katsumura Hiro
Shoji Kawai
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Takenori Masanori
Takuzo Ichihara
Yamashita Gen