Common Tracking Error (LTE)
(CTE) is the RMS average of the symbol-by-symbol deviation from the channel-compensated (equalized) signal expressed in %rms. An ideal signal would not have be tracked (no magnitude scaling or phase adjustment) and the tracking adjustment value would be (mag 1, phase 0) for every symbol-time.
For each symbol-time in the Common Tracking Error trace, the ideal signal's CTE magnitude is subtracted from the measured signal's CTE magnitude and the differences are RMS averaged. Since the ideal signal's CTE magnitude is 1, the calculation can be simplified to the equation shown below.
where CTEm(t) is the measured common tracking error at symbol-time t, and N is the number of symbols in the Measurement Interval.
See Also
