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* [[Carrier-to-receiver noise density]] ''C/''N''<sub>0</sub> |
* [[Carrier-to-receiver noise density]] ''C/''N''<sub>0</sub> |
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* [[Co-channel interference]] (CCI) |
* [[Co-channel interference]] (CCI) |
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* [[Crosstalk |
* [[Crosstalk]] |
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* [[Signal-to-noise ratio]] (SNR or ''S''/''N'') |
* [[Signal-to-noise ratio]] (SNR or ''S''/''N'') |
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* [[SINAD]] (ratio of signal-plus-noise-plus-distortion to noise-plus-distortion) |
* [[SINAD]] (ratio of signal-plus-noise-plus-distortion to noise-plus-distortion) |
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Find sources: "Signal-to-interference ratio" – news · newspapers · books · scholar · JSTOR (June 2007) (Learn how and when to remove this message) |
The signal-to-interference ratio (SIRorS/I), also known as the carrier-to-interference ratio (CIRorC/I), is the quotient between the average received modulated carrier power SorC and the average received co-channel interference power I, i.e. crosstalk, from other transmitters than the useful signal.
The CIR resembles the carrier-to-noise ratio (CNR or C/N), which is the signal-to-noise ratio (SNR or S/N) of a modulated signal before demodulation. A distinction is that interfering radio transmitters contributing to I may be controlled by radio resource management, while N involves noise power from other sources, typically additive white gaussian noise (AWGN).
The CIR ratio is studied in interference limited systems, i.e. where I dominates over N, typically in cellular radio systems and broadcasting systems where frequency channels are reused in view to achieve high level of area coverage. The C/N is studied in noise limited systems. If both situations can occur, the carrier-to-noise-and-interference ratio (CNIRorC/(N+I)) may be studied.
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