Title:
SYNCHRONOUS DETECTING CIRCUIT FOR MULTICARRIER MODULATION SYSTEM
Document Type and Number:
Japanese Patent JP3454220
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a simple multicarrier synchronous detecting device which can estimate a channel with high precision even when the influence of thermal noise and multipath fading is large and is small in circuit scale.
SOLUTION: This circuit is provided with a channel estimating means 208 which estimates a transfer function of radio wave propagation of each subcarrier, a dividing means 213 which equalizes the transfer function of a radio wave propagation channel, a feature quantity detecting means A which calculates feature quantities by subcarriers from estimated channel transfer functions of the respective subcarriers, and an adaptive filter means B which smooths the estimated channel transfer functions of the respective subcarriers among the subcarriers. According to the feature quantities by the subcarriers, characteristics of the adaptive filter means B are adaptively controlled. An example of the feature quantity is an amplitude quantity of each subcarrier, a phase rotation quantity between subcarriers, a difference vector between subcarriers, a modulation system of each subcarrier, or their combination.
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Inventors:
Takeshi Onizawa
Masato Mizoguchi
Tomoaki Kumagai
Toru Sakata
Masahiro Morikura
Masato Mizoguchi
Tomoaki Kumagai
Toru Sakata
Masahiro Morikura
Application Number:
JP2000039889A
Publication Date:
October 06, 2003
Filing Date:
February 17, 2000
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
H04J11/00; H04B7/208; H04B14/08; H04J1/00; H04L5/06; H04L25/02; H04L27/26; (IPC1-7): H04J11/00
Domestic Patent References:
| JP2000286821A | ||||
| JP11163822A | ||||
| JP11239115A | ||||
| JP10257013A | ||||
| JP1117642A |
Attorney, Agent or Firm:
Keiichi Yamamoto