Cooperative spectrum sensing decision fusion method based on multi-user cooperation
A technology of cooperative spectrum sensing and decision fusion, applied in the field of cooperative spectrum sensing in cognitive radio, which can solve the problems of insufficient consideration, reduced detection accuracy, and reduced detection performance of the sensing system.
Inactive Publication Date: 2016-01-20
XIDIAN UNIV
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However, these detection algorithms only consider how to improve the performance of the information reporting stage, and do not fully consider the impact of local perception on the entire perception system, resulting in a decrease in the accuracy of detection at the fusion center, and the detection performance of the perception system under low SNR decline
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[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0035] refer to figure 1 , the implementation steps of the present invention are as follows:
[0036] Step 1: The baseband discrete signal s(n) sent by the authorized user is transmitted through the sensing channel and arrives at Q user sensing nodes participating in cooperative sensing, then the time domain signal received by the kth sensing user is y k(n), where k ∈ {1,2,...,Q}, n indicates the sampling location.
[0037] Step 2: According to the time domain signal received by the sensing user, use energy detection to calculate the detection amount T of each sensing user k :
[0038] T k = 1 N Σ n = 0 N - 1 | ...
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The invention discloses a cooperative spectrum sensing decision fusion method based on multi-user cooperation. The cooperative spectrum sensing decision fusion method mainly solves the problems that according to the existing sensing technology, the false alarm probability is high, and the local detection performance is poor. The method comprises the steps that (1) energy detection is conducted on a signal received by a receiving terminal, and then the detection capacity is obtained; (2) the detection capacity is compared with a local sensing judgment threshold, and then a local judgment result is obtained; (3) OOK modulation is conducted on the judgment result, and then a modulated signal is obtained; (4) the signal obtained after users exchange modulation with one another is sensed and sent to a fusion center; (5) the fusion center conducts detection through the likelihood ratio according to the received signal, and then detection data are obtained; (6) the detection data are compared with the judgment threshold of the fusion center, so that whether an authorized user signal exists in a channel to be sensed is judged. By means of the cooperative spectrum sensing decision fusion method based on multi-user cooperation, the reliability of local sensing can be effectively improved, good detection performance is achieved under the condition of a fading channel with a low signal to noise ratio, and the method can be applied to various broadband wireless communication systems.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a cooperative spectrum sensing method in cognitive radio, which can be widely applied to various new-generation wireless communication systems. Background technique [0002] The radio spectrum is a limited physical resource shared by various wireless services. The existing spectrum authorization mechanism provides an effective way to ensure high-quality services and avoid interference, but this mechanism leads to very low utilization of radio spectrum resources. . With the sharp increase in the current demand for wireless communication services, the demand for radio spectrum resources will further increase, and people have to pay attention to the shortage of wireless spectrum resources in the future; on the other hand, the survey report on radio spectrum shows that the current Much of the licensed spectrum is underutilized. In the face of conflicts an...
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IPC IPC(8): H04B17/382
Inventor 王勇樊琴葛建华宫丰奎李靖
Owner XIDIAN UNIV