Optimal Power Allocation Method in Multi-channel Cognitive Wireless Networks Based on Convex Optimization

Abstract

The optimal power allocation method in the multi-channel cognitive wireless network based on convex optimization disclosed by the present invention establishes a multi-channel cognitive wireless network model based on the frequency-common sharing mechanism, and establishes the total transmission power in peak form and each The optimization problem of maximizing the total communication rate of secondary users under the constraint of interference power of multiple channels, the convexity of the optimization problem is verified by using the convex optimization theory, and it is decomposed into sub-problems under specific channel conditions, and the Lagrange The dual method gives the KKT condition that the optimal solution satisfies, and gives the expression of the optimal solution with respect to the dual variable. Finally, the optimal power allocation scheme is solved by using the dichotomy method and the subgradient method. The present invention jointly considers multiple channels for spectrum sharing, adopts instantaneous peak interference power constraints to strictly protect primary users from interference, and uses multiple channels to enable secondary users to use greater transmission power to transmit, thereby further improving the comprehensiveness of spectrum resources utilization rate.

Description

technical field [0001] The invention relates to the technical field of power allocation of wireless networks, in particular to an optimal power allocation method in a multi-channel cognitive wireless network based on convex optimization, aiming at rationally allocating multi-channel resources and improving spectrum resource utilization. Background technique [0002] The ideal working frequency band of the wireless communication system is mainly in the range of 30MHz to 40GHz. With the rapid development of wireless communication technology, more and more wireless systems and services have appeared within the limited available communication frequency band. However, the current communication frequency band The allocation adopts the method of administrative authorization. The management department divides the designated spectrum area and designates a certain wireless system to exclusively occupy the frequency band. This makes the limited spectrum more and more crowded with the in...

AI Technical Summary

Problems solved by technology

[0002] The ideal working frequency band of the wireless communication system is mainly in the range of 30MHz to 40GHz. With the rapid development of wireless communication technology, more and more wireless systems and services have appeared within the limited available communication frequency band. However, the current communication frequency band The allocation adopts the method of administrative authorization. The management department divides the designated spectrum area and designates a certain wireless system to exclusively occupy the frequency band. This makes the limited spectrum more and more crowded with the increase of the system, which makes the spectrum resources very large. in short supply

On the other hand, a large number of actual measurements show that the allocated frequency bands have not been effectively used, and there are a large number of idle spectrums that cannot be used due to administrative authorization.

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