Jun 27, 2017

In-Band Interference Analysis

In-band interference can be caused by a number of sources, but most common would be the presence of an undesired signal source operating on the same channel assigned to an authorized user.

At times, the offending signal can originate from a television station in a distant market assigned to the same channel. Under certain conditions, the signal from the distant market broadcaster can travel farther than planned, overlapping the signal of the broadcaster assigned to the same channel and resulting in co-channel interference (CCI).

Other possible sources of in-band noise include signal modulation and amplification imperfections, adjacent channel interference and energy leakage resulting from poor filtering and violation of emission mask requirements.

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Adjacent channel energy leakage visualized on the ActiveCore

Regardless of where it originates, the offending transmission degrades the quality of the desired signal. Such ghost signals and non-linearity products can cause a low signal-to-noise ratio and a higher bit error rate. Ultimately, such in-band interference can interrupt service or cause outright failure, taking a broadcaster’s channel off air and resulting in advertising make-goods and loss of revenue.

 


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