m consistent sp
|
Tags: Mobile edit Mobile web edit
|
||
Line 5: | Line 5: | ||
==Carrier-to-noise-and-interference ratio (CNIR)== |
==Carrier-to-noise-and-interference ratio (CNIR)== |
||
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. |
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.?? |
||
==See also== |
==See also== |
This article does not cite any sources. Please help improve this articlebyadding citations to reliable sources. Unsourced material may be challenged and removed.
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.??