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{{Short description|Ratio of useful signal versus co-channel interference received}} |
{{Short description|Ratio of useful signal versus co-channel interference received}} |
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| ⚫ | The '''signal-to-interference ratio''' ('''SIR''' or '''''S/I'''''), also known as the '''carrier-to-interference ratio''' ('''CIR''' or '''''C/I'''''), is the quotient between the average received modulated carrier power ''S'' or ''C'' and the average received [[co-channel interference]] power ''I'', i.e. [[crosstalk]], from other transmitters than the useful signal.<ref>{{Cite book |last=Schwartz |first=Mischa |url=https://books.google.com/books?id=rAiyyKM9ppoC&newbks=0&hl=en |title=Mobile Wireless Communications |date=2005 |publisher=Cambridge University Press |isbn=978-0-521-84347-8 |pages=63-64 |language=en}}</ref><ref>{{Cite web |title=Signal to Interference Ratio - an overview {{!}} ScienceDirect Topics |url=https://www.sciencedirect.com/topics/computer-science/signal-to-interference-ratio |access-date=2023-01-11 |website=www.sciencedirect.com}}</ref> |
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{{Unreferenced|date=June 2007}} |
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| ⚫ | The '''signal-to-interference ratio''' ('''SIR''' or '''''S/I'''''), also known as the '''carrier-to-interference ratio''' ('''CIR''' or '''''C/I'''''), is the quotient between the average received modulated carrier power ''S'' or ''C'' and the average received [[co-channel interference]] power ''I'', i.e. [[crosstalk]], from other transmitters than the useful signal. |
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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 |
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). |
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==Carrier-to-noise-and-interference ratio (CNIR)== |
==Carrier-to-noise-and-interference ratio (CNIR)== |
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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 |
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 (CNIR or ''C/(N+I)'') may be studied. |
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==See also== |
==See also== |
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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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== References == |
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[[Category:Engineering ratios]] |
[[Category:Engineering ratios]] |
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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.[1][2]
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 (CNIR or C/(N+I)) may be studied.
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