Mobility

Fast and Reliable Sensing Using a Background Process for Noise Estimation

Date Added: Jun 2011
Format: PDF

This paper presents an efficient way to ensure a good detection performance by implementing algorithms running in background a reliable noise estimation process. The proposed solution operates at two different time scales: a slow time scale to determine in adjacent sub-bands the supposed slowly varying noise level, and a faster time scale to determine in the band of interest the presence of signal, using a reliable energy detection solution. In order to identify the free bands where the noise variance can be estimated, the paper describes several blind and semi-blind strategies based on the statistical properties of the received signal.