Detection of GSM interference in a CDMA wireless communication link
K. C. Ho, S. Tutsanasuwan, Curtis Davis · 2002
Two popular digital cellular standards deployed in North America are IS-95 CDMA and GSM. If these two systems are operating within the same geographic area such as a large metropolitan city, their signals can interfere with each other and cause performance degradation. This paper proposes the use of the least-squares technique in the spectral domain to identify the presence of GSM interference in a CDMA signal and to estimate the interference level if it is present. Simulation results show that the proposed method can detect interference with a signal-to-interference ratio up to 14 dB when the observation time is 20 msec and the signal-to-noise ratio is 10 dB.