Signal-to-interference ratio

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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.[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).

Carrier-to-noise-and-interference ratio (CNIR)[edit]

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[edit]


  1. ^ Schwartz, Mischa (2005). Mobile Wireless Communications. Cambridge University Press. pp. 63–64. ISBN 978-0-521-84347-8.
  2. ^ "Signal to Interference Ratio - an overview | ScienceDirect Topics". Retrieved 2023-01-11.