Power distribution method of channel sharing for large-scale users in uncertainty condition of channel

Abstract

The invention provides a power distribution method of channel sharing for large-scale users in an uncertainty condition of a channel. The method includes: calculating the link loss between secondary users; calculating the mutual interference between the secondary users and the sum of the throughputs of all the secondary users; calculating the optimal emission power in each secondary user link in accordance with the secondary user peak value power constraint and the interference constraint between the secondary users; and substituting the optimal emission power into a primary user constraint condition for verification, determining the fact that the optimal emission power is the most reasonable emission power if the interference constraint condition of a primary user is satisfied, otherwise, reducing the optimal emission power for one step, and re-substituting the optimal emission power into the primary user constraint condition for verification until the most reasonable emission power is found. According to the method, in the uncertainty condition of the channel, the power distribution method for maximizing the total throughput of the secondary users can be searched.

Description

technical field [0001] The invention relates to the cognitive radio field of wireless communication technology, in particular to a method for power allocation of a large-scale user shared channel under the condition of channel uncertainty. Background technique [0002] With the increasing demand for free communication between people, wireless personal communication is more and more widely used to exchange personal information, which makes a sharp contradiction between the increasing demand for high-speed wireless data and the increasing shortage of wireless spectrum resources. A basic contradiction prompts the rapid development of wireless communication technology. As a key technology to solve this contradiction, cognitive radio has broad prospects. Cognitive radio is to make full use of the licensed frequency band by allowing unlicensed users to opportunistically use the spectrum resources of licensed users without affecting the normal communication of licensed users. Usi...

AI Technical Summary

Problems solved by technology

[0005] However, there are some challenges in the practical application of this power allocation method for large-scale user-shared channels under the condition of channel uncertainty: (1) In cognitive radio networks, the primary user will be interfered by the signal transmitted by the secondary user, while The channel state information between the receiver of the primary user and the transmitter of the secondary user is unknown; (2) When large-scale secondary users access the spectrum resources of the primary user for communication, there will be interference between each other, and this interference is inevitable; ( 3) To ensure the service quality of the primary user, it is necessary to ensure that the interference received by the primary user is within a certain threshold range

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