interference
Any unwanted signal that degrades the quality or availability of a desired satellite communication link, arising from co-channel, adjacent-channel, cross-polarisation, or terrestrial sources.
Full Definition
In satellite communications, interference refers to any extraneous radio-frequency energy that impairs a receiver's ability to correctly demodulate the intended signal. Types include co-channel interference (from another satellite using the same frequency), adjacent satellite interference (from a neighbouring orbital slot), cross-polarisation interference (from the orthogonally polarised frequency reuse partner), and terrestrial interference (from earth-based transmitters). Interference is characterised by its carrier-to-interference ratio (C/I). Editors will encounter interference in regulatory filings, coordination agreements, interference investigation reports, and ITU documentation. The term is distinct from 'noise', which is random and unavoidable, whereas interference is a deterministic, often addressable impairment.
Usage
Usage note: Distinguish from 'noise' (thermal, random) and 'intermodulation' (distortion products generated within the satellite or amplifier chain). In regulatory contexts, 'harmful interference' is an ITU-defined term with specific legal implications and should be quoted precisely from ITU Radio Regulations when used.
In Context
- "The coordination agreement established minimum angular separation requirements to limit adjacent satellite interference." — ITU coordination filing
- "The NOC identified the source of uplink interference as a mispointed VSAT terminal in the affected beam." — Interference investigation report