Real-time estimation of the signal to interference ratio in cellular radio systems

The signal to interference atio (SIR) has been highlighted in the literature to be a most efficient criterion for several methods aiming at reducing the effects of cochannel interference. We derive two fast SIR estimation algorithms for narrow-band cellular systems. Simulation results for a GSM like system show that with the use of one of the methods, the SIR can be estimated to within an error of 1 dB after only 4.6 ms (i.e. after one frame), or within an error of 0.3 dB after only 60 ms.