Optimal power distribution scheme in multi-channel cognitive wireless network based on convex optimization

Abstract

The invention discloses an optimal power distribution scheme in a multi-channel cognitive wireless network based on convex optimization. A multi-channel cognitive radio network model based on a frequency spectrum sharing mechanism is established. An optimization problem of maximizing the total communication rate of the secondary user under the constraint of the total transmitting power in a peak form and the interference power of each channel is established; the convexity of the optimization problem is verified by using a convex optimization theory, the optimization problem is decomposed intosub-problems in a specific channel state, the KKT condition satisfied by the optimal solution is given by using a Lagrange dual method, the expression of the optimal solution about dual variables is given, and finally, the optimal power allocation scheme is solved by using a dichotomy and a sub-gradient method. According to the method, multiple channels are jointly considered for frequency spectrum sharing, instantaneous peak interference power constraints are adopted to strictly ensure that the primary user is not interfered, and meanwhile, multiple channels are utilized to enable the secondary user to transmit with higher transmitting power, so that the comprehensive utilization rate of frequency spectrum resources is further improved.

Description

technical field [0001] The invention relates to the technical field of power allocation of wireless networks, in particular to an optimal power allocation scheme 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...

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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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