An Estimation Method of Signal Center Frequency and Bandwidth

Abstract

The invention discloses a method of estimating a signal center frequency point and a bandwidth. The method comprises steps: a receiver antenna is measured, and a gain curve for the antenna in a receiving frequency band is obtained; the received signals at each time are subjected to Fourier transform to obtain a frequency spectrum, and the frequency spectrum is compensated according to the gain curve; the average value for frequency spectrum absolute values after multiple times of received signal compensation is calculated, a first frequency spectrum is obtained through smoothing processing, a second frequency spectrum is obtained through left-right turning and then smoothing filtering, and by such analogy, an Nth frequency spectrum is obtained, wherein N is an even number; positions and peak values of all peaks in the Nth frequency spectrum are acquired; as for any peak, a first position and a second position when the Nth frequency spectrum falls to a peak setting threshold multiple for the first time to the left and to the right are found out, a peak extending interval length is thereafter calculated, and peaks whose extending intervals are zero are removed; and the bandwidth and the center frequency point of any left peak are calculated. The method of the invention has the following advantage that the signal center frequency point and bandwidth estimation difficulty in a low-signal-to-noise ratio environment can be solved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a method for estimating a signal center frequency point and bandwidth. Background technique [0002] In the field of wireless communication technology, it is possible for a receiver to simultaneously receive several different signals within the bandwidth of the received signal. These signals may adopt different modulation methods and have different carrier frequencies and signal bandwidths. Therefore, before parameter estimation, modulation identification and demodulation of these signals, the center frequency and bandwidth of the signal must be estimated first. [0003] The existing signal bandwidth estimation methods are directly estimated on the signal spectrum or power spectrum. Because the signal spectrum itself fluctuates violently and has many glitches, it is difficult to distinguish the signal from the noise when the signal-to-noise ratio is low. Content...

AI Technical Summary

Problems solved by technology

[0005] For this reason, the object of the present invention is to propose a kind of estimation method of signal center frequency point and bandwidth, by smoothing and filtering signal spectrum to solve the problem that frequency spectrum fluctuates violently, a lot of burr; Bandwidth, thus solving the problem of signal center frequency and bandwidth estimation in low SNR environment

Images