ADInstruments S7200 Operation Manual page 155

AD INSTRUMENTS S7200 TV Signal Analyzer Operation Manual
However, when the interference signal is broadband in nature, which means the
interference signal bandwidth is close to or wider than the QAM signal bandwidth
(6MHz or 8MHz), like an LTE signal for example, the EVS time domain function is
recommended to make use of the LTE signal time domain characteristics. In recent
years, the most disrupting and increasingly used broadband signals are cellular
LTE signals and have been found to creep their way into an HFC network and
interfere with the QAM signals being transmitted over Cable at the same
frequencies. Frequently used LTE bandwidths are 5MHz, 10MHz and 20MHz.
These types of bandwidth are all close or wider than DVB-C signal bandwidth.
Both LTE signals and DVB-C signals are digital signals, all of them are similar with
noise. The S7200 uses the EVS time domain function to measure the LTE
interference results, shown as the below Figure 6-25.
Figure 6-25 Error Vector Spectrum – Time Domain
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