Cooperation spectrum sensing method based on network encoding
A collaborative spectrum sensing and network coding technology, applied in transmission monitoring, digital transmission systems, electrical components, etc., can solve problems such as inability to achieve error-free transmission
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[0079] In this example, if figure 1As shown, there is an authorized user, multiple cognitive users and a base station in the cooperative spectrum sensing system, and only some cognitive users upload sensing information through the report channel. Assuming that the optimal relay node has been selected, taking the uploading of two cognitive users CR1 and CR2 as an example, it is discussed how to use the interaction information between cognitive users to improve the reliability of perceptual information transmission.
[0080] The flow of this embodiment is as follows image 3 shown, including the following steps:
[0081] Collaborative Network Coding Design Method
[0082] (a). Cognitive users use the energy perception method for local perception, that is, the energy value is accumulated over a period of time Where y(i) is the signal received by the cognitive user, u is the time-bandwidth product; the cognitive user makes a local decision, that is, compares θ with the set thr...
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