Calibration frequency Offset transmitter and receiver with USRP® material

Hello everyone, I read the scripts provided by The Mathworks on the frequency of calibration offset transmitter and receiver with USRP.

The USRP® transmitter sends a sinusoidal signal at 100 Hz with the MATLAB, sdruFrequencyCalibrationTransmitter.mscript, the USRP® receiver. The USRP® receiver monitors the signals, calculates the transceiver frequency shift and displays in the command window MATLAB for calibration with the MATLAB script, sdruFrequencyCalibrationReceiver.m.  At the level of the receiver, frequency offset will be calculated and displayed in the command window. The program uses a Spectrum Analyzer to show the spectrum of the received signal. In the program, the corresponding sentense is '% display frequency spectrum. step (hSpectrumAnalyzer, rxSig); "Based on that, I thought that the spectrum analyzer would show the spectrum of the received signal. However, the Web site corresponding site shows "to compensate for a shift in frequency of transmitter/receiver, add frequency offset on the Central frequency of the receiver object SDRu system. Be sure to use the sign of the offset of your addition. Once you have done this, the spectrum displayed by the Analyzer of spectrum of the receiver system object must have its maximum amplitude at about 0 Hz." What I'm confused is, why the Spectrum Analyzer should have its maximum amplitude at about 0 Hz, not other values? Is it because of the characteristics of the USRP itself or the Analyzer of spectrum shows is the value of the difference between the Tx and the Rx after calibration?  I use neither-USRP 2920. Your response will be much appreciated! Thank you!

The matlab mfile is found in the following links:

http://UK.MathWorks.com/help/supportpkg/usrpradio/examples/frequency-offset-calibration-receiver-wit...

http://UK.MathWorks.com/help/supportpkg/usrpradio/examples/frequency-offset-calibration-transmitter-...

Yes if two devices are not locked to a reference clock, 10 MHz for the USRPs you will see a shift in frequency.

Specifications in ppm, ppb can give you how it can be:
http://digital.NI.com/public.nsf/allkb/2A0B9D3F365DEDEF86256BDB007354ED

Bye!

Tags: NI Products

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