Title:
【発明の名称】直接シーケンス・スペクトラム拡散通信システムにおける搬送波のオフセットおよび拡散コードのタイミング・オフセットを補正するための方法およびアーキテクチャ
Document Type and Number:
Japanese Patent JP2934235
Kind Code:
B1
Abstract:
A method and an architecture for correcting carrier frequency offset and spreading code timing offset in a direct sequence spread spectrum communication system are disclosed. In the present invention, the carrier frequency offset is divided into an integer part and a fractional part, wherein the integer part is defined as integer multiples of the reciprocal of the period of a spreading code. The integer part of the carrier frequency offset can be obtained by matching received signals with a spreading code whose central frequency is located at integer multiples of the reciprocal of the period of the spreading code and searching the one, of the matched results, with the largest amplitude. Besides, a direction flag can be obtained by comparing the amplitude of the searched one with that of the matched results neighboring the searched one. After correcting the integer part carrier frequency offset, the difference between the phase angles of two successive matched results can be calculated and used to calculate the fractional part of the carrier frequency offset according to the direction sag. After the carrier frequency offset is corrected, the correction of the timing offset of the spreading code can be made by searching for the first path of the channel impulse response which produces the minimum delay spread.
Inventors:
CHIA CHI FUAN
SHIN YUAN WAN
YUU MAIU JON
SHIN YUAN WAN
YUU MAIU JON
Application Number:
JP22388498A
Publication Date:
August 16, 1999
Filing Date:
August 07, 1998
Export Citation:
Assignee:
CHUNGU SHAN INST OBU SAIENSU ANDO TEKUNOROJII
International Classes:
A61F2/06; H04B1/10; H04B1/7075; H04B7/216; H04L7/00; H04L27/30; H04L27/00; H04B; (IPC1-7): H04B1/707; H04B1/10; H04L7/00
Domestic Patent References:
| JP1028076A | ||||
| JP10500555A |
Attorney, Agent or Firm:
Masao Okabe (11 others)