On detection of the number of signals in presence of white noise
Journal of Multivariate Analysis
Cochannel interference estimation for M-ary PSK modulated signals
Wireless Personal Communications: An International Journal
Microwave Mobile Communications
Microwave Mobile Communications
A framework for uplink power control in cellular radio systems
IEEE Journal on Selected Areas in Communications
Power control in wireless networks: characteristics and fundamentals
Wireless communications systems and networks
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The Signal-to-Interference Ratio (SIR) has been highlighted in the literature to be a most efficient criterion for several methods aiming at reducing the effects of cochannel interference, e.g., diversity reception, dynamic channel allocation and power control. In this paper we address the problem of how to obtain fast and accurate measurements of this parameter in a practical context. We develop a general SIR estimation technique for narrow-band cellular systems that is based on a signal subspace approach using the sample covariance matrix of the received signal. Simulation results using the frame structure in the GSM system show that the SIR can be estimated to within an error of 0.3 dB after only 200 ms, or within an error of 0.1 dB after only 0.6 seconds.