Bringing New Power and Precision to Gated Spectrum Measurements
Tom Wright, Joe Gorin, & Ben Zarlingo
Making accurate spectrum and power measure-ments—including adja-cent channel power (ACP), CCDF, etc.—on the desired portion of time-varying and com-plex-modulated signals is now a common measure- ment challenge. Many modern communica-tions signals such as WiMAX are RF “bursted” and have spectral content which varies during each burst. These signals are often measured using a spectrum analyzer and one of several types of time-selective spectrum analysis. The most powerful approach for swept analysis is called “gated LO” or simply “gated sweep.” For this type of measurement, the sweeping local oscillator of the analyzer is directed to sweep and measure only during the desired portion of the signal.
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