Title:
SYSTEM AND DEVICE FOR CDMA MOBILE COMMUNICATION
Document Type and Number:
Japanese Patent JP3158821
Kind Code:
B2
Abstract:
PURPOSE: To prevent the throughput of a traffic channel from being lowered and to eliminate the malfunction of a PLL and characteristic degradation at the reception part of a mobile station by inserting a unique word for frame synchronism to a pilot to be a reference signal for each frame cycle.
CONSTITUTION: The transmission part of a base station inserts the unique word, which is generated by a unique word inserting part 26, to pilot data generated from a data generating part 21 for each frame cycle at a pilot channel. Afterwards, circuits 22 and 23 perform phase modulation and spectrum diffusion. At the reception part of the mobile station, a radio signal transmitted from the base station is carrier-demodulated by a demodulation circuit 31 and inversely diffused later by an inverse spectrum diffusion circuit 32. At a frame synchronizing circuit 34, the unique word is searched while using a pilot ch phase- corrected by a subordinate synchronizing detection demodulating part 33a and a frame head detect signal is outputted to the subordinate synchronizing detection demodulating part 33a so that the received data can be demodulated at suitable timing.
Inventors:
Naoya Kobayashi
Takashi Yano
Nobukazu Doi
Takashi Yano
Nobukazu Doi
Application Number:
JP31301893A
Publication Date:
April 23, 2001
Filing Date:
December 14, 1993
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
H04L27/22; H04B1/7073; H04B7/26; H04J13/00; H04W56/00; (IPC1-7): H04B7/26; H04J13/04; H04L27/22
Domestic Patent References:
| JP3289831A |
Other References:
【文献】米国特許5103459(US,A)
Attorney, Agent or Firm:
Yasuo Sakuta