Dynamic channelization method based on short-time Fourier transform
A short-time Fourier and dynamic technology, which is applied in the field of signal transmission, can solve problems such as false detection and missed detection, and achieve the effect of improving performance and solving inaccurate estimation
Pending Publication Date: 2022-04-08
重庆两江卫星移动通信有限公司
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is that in the prior art, the judgment of signals in each sub-channel is affected by random noise, and false detection and missed detection will occur. The purpose is to provide a dynamic channelization method based on short-time Fourier transform , which improves the accuracy of judging the signal transmission in the sub-channel
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[0061] This embodiment discloses a dynamic channelization detection method based on short-time Fourier transform, such as Figure 1 ~ Figure 3 As shown, the method steps include:
[0062] S1: Construct a filter bank that satisfies the approximately complete reconstruction characteristic, and the coefficient of the filter bank is p;
[0063] The sub-steps of step S1 include:
[0064] S11: Construct a filter bank by using a Caesar window function or a least square method;
[0065] In step S11, the constructed filter bank is constructed using the classic filter construction method, the Caesar window function or the least squares method, and a linear phase low-pass filter with a length of N is constructed. The passband of the filter is Bandwidth is Take the filter coefficient as the initial coefficient of the designed prototype filter, and record it as a column vector p;
[0066] S12: Obtain the cutoff frequency bandwidth of the filter bank based on the passband bandwidth of ...
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The invention discloses a dynamic channelization method based on short-time Fourier transform, and the method comprises the steps: constructing a filter bank meeting the approximate complete reconstruction characteristic, and enabling the coefficient of the filter bank to be p; a short-time Fourier transform method is adopted to detect whether signal transmission exists in the frequency band of each sub-channel when a signal passes through the filter bank, and if it is detected that a signal output condition and a non-signal output condition exist in each sub-channel at the same time, dynamic channelization is met when the signal is filtered through the filter bank; the method has the beneficial effects that the dynamic performance of the digital dynamic channel is effectively improved by a dynamic method for avoiding estimating the noise power of each sub-channel; on the basis of simplifying the design of the filter bank, the problem of inaccurate sub-channel noise power estimation is solved.
Description
technical field [0001] The present invention relates to the technical field of signal transmission, in particular, to a dynamic channelization method based on short-time Fourier transform. Background technique [0002] The prototype filter design of the filter bank with complete reconstruction characteristics is complex, and the filter order is too high, which is difficult to be used in practice; the sub-channel signal detection causes missed detection and false detection due to the uncertainty of the channel noise power estimation performance And other issues. [0003] In the existing technology, the filter bank method that can accurately reconstruct the signal is constructed, and the order of the designed prototype filter is as high as 13312. The long time delay characteristic makes this kind of filter difficult to realize in engineering; and when the signal reconstruction satisfies In the case of requirements, the problem of complex design of the prototype filter and too...
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IPC IPC(8): H04L25/02
Inventor 杨朝麟蒋兆坚于亚楠
Owner 重庆两江卫星移动通信有限公司