DEVICE, METHOD, AND PROGRAM FOR MEASURING SIGNAL, AND RECORDING MEDIUM

• US 20090055109A1
• Filed: 02/15/2007
• Published: 02/26/2009
• Est. Priority Date: 02/24/2006
• Status: Active Grant

• Current Assignee: Advantest Corporation
• Original Assignee: Advantest Corporation
• Inventors: Nakada, Juichi
• Granted Patent: US 8,185,328 B2
• Time in Patent Office: Days
• US Class Current: 702/57
• CPC Class Codes: G01R 23/16 Spectrum analysis; Fourier analysis
• CPC Class Codes: H04B 17/10 of transmitters
• CPC Class Codes: H04B 17/327 Received signal code power [RSCP]
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04L 1/24 Testing correct operation
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 27/2689 Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation

Abstract

Differences in outputs from multiple terminals are easily measured. There is provided a signal measuring device for receiving signals to be measured which are generated by modulating frequency-different signals different in frequency from each other, and are respectively output from different output terminals, including a combiner which combines the signals to be measured output from the output terminals, a quadrature demodulation unit which demodulates a result of the combining carried out by the combiner, an FFT unit which represents a result of the demodulation in the frequency domain, and a characteristic measuring unit, where the characteristic measuring unit measures data for respective frequencies of the result of the demodulation, acquires output-terminal-corresponding data, which correspond to the respective output terminals, based on the data, derives characteristics of the respective output terminals based on the output-terminal-corresponding data, and acquires a difference in the characteristics between the output terminals based on the derived result.

Claims

1. A signal measuring device for measuring signals to be measured which are generated by modulating frequency-different signals different in frequency from each other, and are respectively output from different output terminals, comprising:

a combiner that combines the signals to be measured output from the output terminals;

a demodulator that demodulates a result of the combining carried out by the combiner combining means;

a measurer that measures data for respective frequencies of a result of the demodulation carried out by the demodulator;

a corresponding data acquirer that acquires output-terminal-corresponding data, which correspond to the respective output terminals, based on the measured data;

a characteristic deriver that derives characteristics of the respective output terminals based on the output-terminal-corresponding data; and

a difference acquirer that acquires a difference in the characteristics between the output terminals based on the derived result of the characteristic deriver.

2. The signal measuring device according to claim 1, wherein the frequency-different signals comprise a first signal having odd frequencies of frequencies arranged at an equal interval, and a second signal having even frequencies of the frequencies arranged at the equal interval.

3. The signal measuring device according to claim 1, wherein the frequency-different signals have equal electric power with respect to each other, the data is an electric power, the characteristic deriver derives the averages of the output-terminal-corresponding data, and the difference acquirer acquires a ratio between the averages.

4. The signal measuring device according to claim 1, wherein the frequency-different signals have equal phase with respect to each other, the data is a quantity representing the phase, the characteristic deriver derives the averages of the output-terminal-corresponding data, and the difference acquirer acquires a difference between the averages.

5. The signal measuring device according to claim 1, wherein the frequency-different signals have no time lag relative to each other, the data is a quantity representing the phase, the characteristic deriver derives rates of change in the output-terminal-corresponding data in terms of frequency, and the difference acquirer acquires a difference between the rates of change.

9. The signal measuring device according to claim 2, wherein the frequency-different signals have equal electric power with respect to each other, the data is an electric power, the characteristic deriver derives the averages of the output-terminal-corresponding data, and the difference acquirer acquires a ratio between the averages.

10. The signal measuring device according to claim 2, wherein the frequency-different signals have equal phase with respect to each other, the data is a quantity representing the phase, the characteristic deriver derives the averages of the output-terminal-corresponding data, and the difference acquirer acquires a difference between the averages.

11. The signal measuring device according to claim 2, wherein the frequency-different signals have no time lag relative to each other, the data is a quantity representing the phase, the characteristic deriver derives rates of change in the output-terminal-corresponding data in terms of frequency, and the difference acquirer acquires a difference between the rates of change.

6. A signal measuring method for measuring signals to be measured which are generated by modulating frequency-different signals different in frequency from each other, and are respectively output from different output terminals, comprising:

combining the signals to be measured output from the output terminals;

demodulating a result of the combining carried out by the combining step;

measuring data for respective frequencies of a result of the demodulation;

acquiring output-terminal-corresponding data, which correspond to the respective output terminals, based on the measured data;

deriving characteristics of the respective output terminals based on the output-terminal-corresponding data; and

acquiring a difference in the characteristics between the output terminals based on the derived result of the characteristic deriving.

7. A program of instructions for execution by the computer to perform a signal measuring process in a signal measuring device for measuring signals to be measured which are generated by modulating frequency-different signals different in frequency from each other, and are respectively output from different output terminals, having:

a combiner that combines the signals to be measured output from the output terminals; and

a demodulator that demodulates a result of the combining carried out by the combiner, said signal measuring process comprising;

measuring data for respective frequencies of a result of the demodulation carried out by the demodulator;

acquiring output-terminal-corresponding data, which correspond to the respective output terminals, based on the measured data;

deriving characteristics of the respective output terminals based on the output-terminal-corresponding data; and

acquiring a difference in the characteristics between the output terminals based on the derived result of the characteristic deriving.

8. A computer-readable medium having a program of instructions for execution by the computer to perform a signal measuring process in a signal measuring device for measuring signals to be measured which are generated by modulating frequency-different signals different in frequency from each other, and are respectively output from different output terminals, having:

a combiner that combines the signals to be measured output from the output terminals; and

a demodulator that demodulates a result of the combining carried out by the combiner, said signal measuring process comprising;

measuring data for respective frequencies of a result of the demodulation carried out by the demodulator;

acquiring output-terminal-corresponding data, which correspond to the respective output terminals, based on the measured data;

deriving characteristics of the respective output terminals based on the output-terminal-corresponding data; and

acquiring a difference in the characteristics between the output terminals based on the derived result of the characteristic deriving.