Title:
CIRCUIT AND METHOD FOR DETECTING FREQUENCY SHIFT AND PORTABLE COMMUNICATION TERMINAL
Document Type and Number:
Japanese Patent JP3877158
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To secure an excellent receiving characteristic by detecting a Doppler frequency with high accuracy and preventing a transmission diversity effect from deteriorating.
SOLUTION: A reception demodulating unit 34 has a path search and path selection unit 9 for measuring a delay profile of a multipath spread signal, respective finger processing units 35_1 to 35_n for despreading a spread signal of each path, calculating a phase variation component as a channel estimate value for each path and using the channel estimate value to perform coherent detection, a phase difference measuring unit 10 for measuring a phase difference from the phase variation component of each channel estimate value, a path timing difference measuring unit 12 for measuring a periodical path timing difference by the delay profile, a frequency error detecting unit 15 for using the path timing difference and the phase difference to detect a signal frequency error, and a Doppler frequency detecting unit 19 for detecting a Doppler frequency on the basis of the frequency error.
Inventors:
Takashi Nakayama
Application Number:
JP2002316929A
Publication Date:
February 07, 2007
Filing Date:
October 31, 2002
Export Citation:
Assignee:
Sony Ericsson Mobile Communications Inc.
International Classes:
H04B1/707; H04B1/7087; H04B1/7115; H04B7/06; H04B7/08; H04B7/26; H04L7/00; H04L27/00; H04W16/28; H04W88/02; (IPC1-7): H04B1/707; H04B7/06; H04B7/08; H04B7/26; H04L7/00
Domestic Patent References:
| JP2001298395A | ||||
| JP2003508969A | ||||
| JP2002217785A | ||||
| JP2002076987A | ||||
| JP2000188589A | ||||
| JP2002152088A | ||||
| JP2000286752A |
Attorney, Agent or Firm:
Atsuro Sasaki