Title:
キャリア周波数検出方法
Document Type and Number:
Japanese Patent JP4277090
Kind Code:
B2
Abstract:
Carrier frequency detection for an N-ary modulated signal is achieved by digitizing the N-ary modulated signal, frequency shifting the digitized N-ary modulated signal to prevent aliasing, raising the frequency-shifted signal to the Nth power, transforming the raised signal to frequency domain data and determining an initial maximum frequency peak, iteratively fine shifting the frequency of the N-ary modulated signal around the initial maximum frequency peak and repeating the raising, transforming and determining steps to obtain a plurality of maximum frequency peaks, and calculating the carrier frequency from the maximum frequency peaks and the total related frequency shift.
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Inventors:
Koichi Yoshihara
Application Number:
JP2004014996A
Publication Date:
June 10, 2009
Filing Date:
January 22, 2004
Export Citation:
Assignee:
Tektronix International Sales GmbH
International Classes:
H04L27/227; H04B1/18; H04L7/00; H04L27/14; H04L27/16
Domestic Patent References:
| JP5037576A | ||||
| JP2002290485A | ||||
| JP3117057A | ||||
| JP5041719A | ||||
| JP2003069659A |
Attorney, Agent or Firm:
Nippon Tektronix Co., Ltd.