Title:
遅延ロックループにおける早期-遅延間隔の変化
Document Type and Number:
Japanese Patent JP4446097
Kind Code:
B2
Abstract:
A rake receiver tracks a component of a multipath information signal transmitted over a communication network. The rake receiver aligns and synchronized the component with a locally generated replica of the code sequence that was originally used to spread the information signal at the transmitter side. The rake receiver derives an early de-spread signal using an early shifted version of the replica of the code sequence. The replica is early shifted by a variable delay. The rake receiver also derives a late shifted de-spread signal using a late shifted version of the replica of the code sequence. The replica is late shifted by the same variable delay. The variable delay may be chosen arbitrarily or among a selection of predetermined values. The predetermined values may be selected so that the tracking process is optimized.
Inventors:
Thunder, Rahman
Application Number:
JP2003501085A
Publication Date:
April 07, 2010
Filing Date:
May 28, 2002
Export Citation:
Assignee:
Estee-Ericsson, Society, Anonymous
International Classes:
H04B1/7085; H04B1/7115; H04B1/7117
Domestic Patent References:
| JP10209918A | ||||
| JP2165749A | ||||
| JP2001345739A | ||||
| JP10013307A | ||||
| JP2000101480A | ||||
| JP9023206A | ||||
| JP3094852Y2 |
Foreign References:
| WO1999060729A1 |
Other References:
Wern-Ho Sheen et al.,Effects of Multipath Fading on Delay-LockedLoops for Spread Spectrum Systems,Communications, IEEE Transactions on,1994年,Vol.42, No.2/3/4,pp.1947-1956
Attorney, Agent or Firm:
Kenji Yoshitake
Hidetoshi Tachibana
Takeshi Sekine
Hidetoshi Tachibana
Takeshi Sekine