Device, method, and program for measuring signal, and recording medium

• US 8,185,328 B2
• Filed: 02/15/2007
• Issued: 05/22/2012
• Est. Priority Date: 02/24/2006
• Status: Expired due to Fees

• Current Assignee: Advantest Corporation
• Original Assignee: Advantest Corporation
• Inventors: Nakada, Juichi
• Primary Examiner(s): Suglo, Janet
• Application Number:
  US12/279,433
• Publication Number:
  US 20090055109A1
• Time in Patent Office: 1,923 Days
• Field of Search: 702/57, 702/66, 702/60, 702/71, 324/76.77, 324/76.78, 324/88, 375/316
• 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 which are generated by modulating frequency-different signals that are different in frequency from each other, and are respectively output from different output terminals, comprising:

a combiner that combines the signals that are respectively output from the different output terminals;

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

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

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

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

a difference acquirer that acquires a difference in the characteristics between the different output terminals based on the characteristics derived by 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 2, wherein the frequency-different signals have equal electric power with respect to each other, the measured data is the electric power, the characteristic deriver derives 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 2, wherein the frequency-different signals have equal phase with respect to each other, the measured data is a quantity representing the phase, the characteristic deriver derives 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 2, wherein the frequency-different signals have no time lag relative to each other, the measured data is a quantity representing a 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. The signal measuring device according to claim 1, wherein the frequency-different signals have equal electric power with respect to each other, the measured data is the electric power, the characteristic deriver derives averages of the output-terminal-corresponding data, and the difference acquirer acquires a ratio between the averages.

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

8. The signal measuring device according to claim 1, wherein the frequency-different signals have no time lag relative to each other, the measured data is a quantity representing a 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. A signal measuring method for measuring, with a computer, signals which are generated by modulating frequency-different signals that are different in frequency from each other, and are respectively output from different output terminals, comprising:

combining the signals that are respectively output from the different output terminals;

demodulating a result of the combining;

measuring, via a processor of the computer, measured data for respective frequencies of a result of the demodulating;

acquiring, via the processor of the computer, output-terminal-corresponding data, which corresponds to the different output terminals, based on the measured data;

deriving, via the processor of the computer, characteristics of the different output terminals based on the output-terminal-corresponding data; and

acquiring, via the processor of the computer, a difference in the characteristics between the different output terminals based on the characteristics derived by the deriving.

10. A program of instructions tangibly embodied on a non-transitory computer-readable medium for execution by a computer to perform a signal measuring process in a signal measuring device for measuring signals which are generated by modulating frequency-different signals that are different in frequency from each other, and are respectively output from different output terminals, the computer having:

a combiner that combines the signals that are respectively output from the different output terminals; and

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

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

acquiring output-terminal-corresponding data, which corresponds to the different output terminals, based on the measured data;

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

acquiring a difference in the characteristics between the different output terminals based on the characteristics derived by the deriving.

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

a combiner that combines the signals that are respectively output from the different output terminals; and

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

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

acquiring output-terminal-corresponding data, which corresponds to the different output terminals, based on the measured data;

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

acquiring a difference in the characteristics between the different output terminals based on the characteristics derived by the deriving.