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In cellular mobile systems the on-line assessment of a radio link performance is normally associated with measurements in the received signal power, and is taken before signal demodulation. It determines thresholds for handover policies, transmitting power control, diversity switching schemes, and other operations. However, a large received signal power does not necessarily mean "good quality" when it comes to considering radio links corrupted by cochannel interference, multipath propagation and background noise. In such cases, a better parameter to assess signal quality is the signal-to-interference-plus-noise power ratio (SINR). Although this qualityfactor parameter is well-known in literature, little has been written about how to measure it in a practical context. This work presents a method for the SINR estimation applied to a system using the Digital European Cordless Telecommunications (DECT) specification, but it can also be used by any other system employing constant modulus signals.

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