Self-adaptive noise floor estimation method and broadband carrier detection method thereof

Abstract

The invention discloses a self-adaptive noise floor estimation method and a broadband carrier detection method thereof. The self-adaptive noise floor estimation method comprises the steps of: estimating a noise floor of a whole received signal broadband frequency spectrum based on the self-adaptive noise floor estimation method; subtracting the noise floor from the broadband frequency spectrum to complete correction of the broadband frequency spectrum; carrying out constant false alarm processing on the corrected broadband frequency spectrum and estimating a detection threshold; carrying out spectrum detection on the corrected broadband spectrum according to the obtained detection threshold, in the spectrum detection process, searching for a frequency spectral line larger than the threshold in the broadband power spectrum, and acquiring a sparse vector composed of spectral lines with the amplitude larger than the detection threshold; and combining the adjacent spectral lines, and combining the spectral lines belonging to the same signal in the sparse vector to obtain a broadband carrier detection result. According to the self-adaptive noise floor estimation method and the broadband carrier detection method thereof, broadband noise can be effectively removed, a self-adaptive noise base is formed, the detection efficiency is improved, and the omission detection ratio is reduced.

Description

technical field [0001] The invention belongs to the technical field of electronic communication, in particular to an adaptive noise floor estimation method and a broadband carrier detection method thereof. Background technique [0002] Wideband carrier detection is the basis of the analysis and processing flow of the entire communication system, and its detection efficiency directly affects the subsequent signal processing flow. Signal detection first needs to detect multiple signals in a very wide frequency band. Since the signal and noise are independent of each other, the received broadband signal power spectrum is the superposition of the signal power spectrum and the noise power spectrum. Due to the wide bandwidth of the received signal, the distribution of noise energy in the frequency domain will also change, and the noise floor is often not flat. [0003] In the current mainstream broadband carrier detection technology, the dynamic threshold judgment method is main...

AI Technical Summary

Problems solved by technology

This method is very mature, and the implementation is relatively simple, but there are prominent shortcomings: when the noise floor of the received signal is not flat, the missed detection of the signal is easy to occur, especially when the dynamic range of the received signal is relatively large, the detection efficiency and Accuracy will drop sharply

Images