Title:
入力チャネルのＳ／Ｎ比評価方法及び試験測定装置
Document Type and Number:
Japanese Patent JP6389355
Kind Code:
B2
Abstract:
Described are systems and methods of estimating a Signal-to-Noise (S/N) ratio of an input channel carrying a QAM signal. A Modulation Error Ratio (MER) is calculated for the input QAM signal, but uses only the centermost error values of a constellation of the input QAM signal in generating this modified MER. The modified MER accurately represents the S/N ratio of the input channel carrying the QAM signal. In this way the S/N ratio may be accurately determined using only the received I and Q components of the modulated QAM input signal itself.
Inventors:
Daniel G. Baker
Lakshmanan Gopishanker
George W Tussing
Lakshmanan Gopishanker
George W Tussing
Application Number:
JP2013174836A
Publication Date:
September 12, 2018
Filing Date:
August 26, 2013
Export Citation:
Assignee:
TEKTRONIX,INC.
International Classes:
H04L27/38; H04B17/336; H04L27/00
Domestic Patent References:
| JP2008177852A | ||||
| JP2004304437A | ||||
| JP9275427A | ||||
| JP2011101177A |
Attorney, Agent or Firm:
Yamaguchi International Patent Office