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EURASIP Journal on Advances in Signal Processing
Figure 1 | EURASIP Journal on Advances in Signal Processing

Figure 1

From: Removing non-stationary noise in spectrum sensing using matrix factorization

Figure 1

UMTS base stations account for AGC noise in the ISM band. The AGC lifts the noise floor due to strong signals in the UMTS downlink band (2110–2170 MHz) and is visible as wide-band artifacts in the spectrogram. The noise floor is lifted for tens of MHz, thereby also causing distortion in the 2.4 GHz ISM band. Note that the mobile monitoring equipment picks up the high signal power when an UMTS base station is in the vicinity.

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