Method for cognizing asynchronous synergic frequency spectrum perception in radio
A technology of collaborative spectrum sensing and cognitive radio, applied in the field of spectrum sensing technology, can solve the problems of receiver interference, unavoidable hidden terminal problem of single-node spectrum detection, etc., and achieve the effect of reducing detection time, saving detection time, and simple calculation
Inactive Publication Date: 2012-07-04
SOUTHEAST UNIV
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[0051] 1) The central node transmits a synchronization signal on the control channel, so that the cognitive radio network is in a synchronized state;
[0052] 2) After receiving the synchronization signal, the cognitive node calculates the maximum time-bandwidth product required for energy detection according to the estimated SNR;
[0053] 3) After starting the energy detection, node i (i=1, 2, ..., N) receives the signal y in the monitoring channel through the antenna i (t); y i (t) After being processed by the energy detector, the instantaneous energy detection value Y is obtained i , according to the sequential detection method to obtain the local decision result;
[0054] 4) After obtaining the local judgment result, the cognitive node will report it to the central node;
[0055] 5) The central node also adopts the sequential detection method. Let the central node make a large number decision at time t, first set t=t min . Express the local detection results of cogni...
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The invention discloses a method for cognizing asynchronous synergic frequency spectrum perception in radio, which comprises the following steps that: a cognitive node adopts energy detection in a sequential mode, namely when the likelihood ratio obtained by the cognitive node according to an energy detection value reaches the requirements, the cognitive node makes a local decision according to the likelihood ratio and sends local detection information to a central node; otherwise, the cognitive node continues to perform energy detection until the likelihood ratio reaches the requirements, orthe detection time slot stated by a system, or the final decision related with the local detection of the central node is received. The method puts forward the reliability of each cognitive node according to the local decision, and sends the result of the local decision to the central node in an asynchronous transmission mode. In that way, the cognitive node with high received signal noise-signalratio is bound to send the decision result by taking the lead. The method has less detection time while ensuring the detection performance, reduces the interference time to authorized users, and improves the access utilization rate of frequency spectrum positive holes.
Description
technical field [0001] The invention relates to a cooperative spectrum detection problem in a cognitive radio network, which belongs to the spectrum sensing technology in wireless communication based on cognitive radio. Background technique [0002] With the rapid development of radio technology, the shortage of wireless spectrum resources has gradually become the bottleneck of new radio technology applications. As a precious non-renewable resource, the radio frequency spectrum is mainly authorized by the relevant government departments at present. Generally, a frequency band is only allocated to one radio system. However, the survey found that the utilization of the currently allocated frequency bands is generally low. In order to describe the utilization of the radio spectrum, the concept of spectrum hole is proposed. Spectrum holes are frequency bands that have been licensed for radio systems but are not being used at a specific time or at a specific location. So how t...
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IPC IPC(8): H04W24/10H04L1/00
Inventor 潘志文郭文婷尤肖虎
Owner SOUTHEAST UNIV