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Cognitive radio spectrum sensing method

A cognitive radio and spectrum sensing technology, which is applied in the field of cognitive radio spectrum sensing and CUSUM rapid detection technology, can solve the problems such as no offset is given, and achieve the effect of reduced detection delay and fast detection

Inactive Publication Date: 2016-07-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

But document 4 does not give how to select the appropriate offset

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Embodiment Construction

[0048] Below in conjunction with specific embodiment, further illustrate the present invention.

[0049] In this embodiment, the Matlab2013a simulation platform is used for running experiments. The simulation parameters are: the signal modulation method is QPSK, the signal passes through a Gaussian channel, and the background noise power is 1, assuming that the signal appears at the beginning of the simulation.

[0050] Step 1: The cognitive radio user receives the time-domain signal on the frequency band to be perceived;

[0051] Step 2: Sampling and filtering the received time-domain signal described in step 1 to obtain M sampling and filtering signals: x 0 ,x 1 ,...x M-1 ; Then take the modulus values ​​of the M sampled filtered signals respectively, and obtain the modulus l of the M sampled filtered signals 0 , l 1 ,... l M-1 ; Where M is a natural number; where the sampling period T = 1ms;

[0052] Step 3: Initialize;

[0053] 3.1 Estimate the noise modulus mean v...

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Abstract

The invention provides a cognitive radio spectrum sensing method, belongs to the technical field of cognitive radio and relates to a rapid CUSUM detection technology. According to the cognitive radio spectrum sensing method, by further improving and applying a non-parameter CUSUM detection algorithm to spectrum detection, the shortcomings of an existing rapid detection method can be overcome under the conditions that no signal priori knowledge exists and signal appearing moment is random, and signals can be rapidly detected. The cognitive radio spectrum sensing method can dynamically adjust offset according to the detection situations and further shorten detection delay.

Description

technical field [0001] The invention belongs to the technical field of cognitive radio, and relates to a cognitive radio spectrum sensing method (or a cognitive radio idle spectrum detection method), and to a CUSUM fast detection technology. Background technique [0002] Cognitive radio technology refers to a wireless communication technology in which cognitive radio users detect the available idle spectrum in their surrounding environment through spectrum sensing (or idle spectrum detection) method, and use the idle spectrum for data transmission. The fundamental purpose of cognitive radio technology is to improve spectrum utilization. [0003] The basis of cognitive radio is spectrum sensing. The binary hypothesis model of spectrum sensing is: [0004] h 0 :x(t)=n(t) [0005] h 1 :x(t)=s(t)+n(t) [0006] Among them, x(t) represents the received signal of the cognitive radio user, n(t) represents the background noise, s(t) represents the communication signal, and t rep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/382
CPCH04B17/382
Inventor 李晖陈亚丁李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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