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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 |
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 |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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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 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 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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