XIN Ji-rong, LU Lu-xi, BAO Xin, et al. Noise Energy Estimator Based on Sparseness of Time-Frequency Domain for Broadband Frequency-Hopping Signal[J]. Acta Electronica Sinica, 2014, 42(10): 1932-1937.
XIN Ji-rong, LU Lu-xi, BAO Xin, et al. Noise Energy Estimator Based on Sparseness of Time-Frequency Domain for Broadband Frequency-Hopping Signal[J]. Acta Electronica Sinica, 2014, 42(10): 1932-1937. DOI: 10.3969/j.issn.0372-2112.2014.10.010.
Noise estimation is the basis of the adaptive blind signal detection.It provides the thresholds of automatic detector based on the CFAR (Constant False Alarm Rate) rule.The traditional noise estimator was complicated and cannot be easily implemented in the on-line blind signal processing system for the satellite broadband frequency-hopping signal.Utilizing the sparseness of the frequency-hopping signal
a new algorithm was proposed to facilitate the noise estimation.The reliability and complexity of the algorithm was analyzed theoretically
and the effectiveness was verified through both simulations and real signal experiments.Compared to the classical algorithm
the proposed algorithm can provide similar noise estimation results
while its computational complexity and buffer consumption was significantly reduced.