Method for adaptively and rapidly sensing cyclic spectrum in cognitive radio system
A cognitive radio and cyclic spectrum technology, which is applied in the field of adaptive and fast sensing of cyclic spectrum in cognitive radio systems, can solve problems such as prolonging the sensing time, and achieve the effect of shortening the sensing delay.
Active Publication Date: 2012-09-26
HARBIN INST OF TECH
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Problems solved by technology
[0004] The present invention aims to solve the problem of prolonging the sensing time of cyclic spectrum sensing in a cognitive radio system, thereby providing an adaptive fast sensing method for cyclic spectrum in a cognitive radio system
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specific Embodiment approach 1
[0034] Embodiment 1. An adaptive fast sensing method for cyclic spectrum in a cognitive radio system, which is implemented by the following steps:
[0035] Step 1. The receiver receives a section of cognitive radio signal, and samples the cognitive radio signal at a sampling rate f s Sampling and quantization, after quantization, intercept a length of N 1 The received signal sequence x(n);
[0036] The receiver continues to receive a cognitive radio signal, samples and quantifies the received cognitive radio signal, and stores it in the No. 1 register;
[0037] Step 2, recording the overlapping portion data of length P behind in the received signal sequence x(n) in recording step 1, storing the overlapping portion data of P in the No. 2 register with said length;
[0038] Step 3, performing fast Fourier transform on the received signal sequence x(n) in step 1 to obtain the transformed sequence X(k);
[0039] Step 4. Divide the transformed sequence X(k) obtained in step 3 in...
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The invention discloses a method for adaptively and rapidly sensing a cyclic spectrum in a cognitive radio system, relates to a method for adaptively and rapidly sensing the cyclic spectrum, and aims to solve the problem of long sensing time delay for sensing the cyclic spectrum in the cognitive radio system. According to the method, the sensing time delay is shortened under the condition of ensuring the sensing accuracy of the cyclic spectrum by data overlapping and an adaptive data length control method; a data overlapping way is adopted to estimate the cyclic spectrum, so that the requirement on data size is reduced, and the variance of estimation is reduced; meanwhile, adaptive data length selection is adopted, and an appropriate data length is selected by estimating a signal to noise ratio; when a channel condition is good, the signal to noise ratio is high, and a cyclic spectrogram can be accurately estimated by selecting short data to calculate; and when the channel condition is not good, long data is selected to estimate the cyclic spectrogram, and calculation amount of the data is reduced. The method is applied to the adaptive and rapid sensing of the cyclic spectrum in the cognitive radio system.
Description
technical field [0001] The invention relates to an adaptive fast sensing method of cyclic spectrum. Background technique [0002] In cognitive radio systems, spectrum sensing usually uses energy detection, matching detection, interference temperature detection, and cyclic spectrum detection methods. Among them, although the energy detection method has a fast perception speed, the perception accuracy is not high, and the perception threshold is difficult to choose; the matched filter detection method is usually not used in cognitive perception due to the lack of prior information; interference temperature detection Because of the need to accurately locate authorized users, otherwise it is easy to cause interference to authorized users. Cyclic spectrum detection technology has high detection accuracy and can effectively avoid noise interference, but it has a large amount of calculation and long detection time. [0003] In a communication system, since the signal is encoded, ...
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IPC IPC(8): H04B17/00H04B17/309
Inventor 谭学治李夏马琳李秀华杨小龙盛飞
Owner HARBIN INST OF TECH