A Method for Robust Energy-Efficient Transmission in Cognitive Networks

Abstract

The invention discloses a method for robust energy-efficient transmission in a cognitive network. The channel state information of the relevant channel is measured by the receiving end of the secondary user and fed back to the sending end of the secondary user; the sending end of the secondary user performs multiple measurements Determine the uncertain set of each channel gain; the secondary user models the problem of maximizing the energy efficiency of the secondary user according to the robust optimization method; solves the worst channel gain and converts the primary user service quality requirement constraint into a convex constraint; according to the power allocation The algorithm solves the optimal transmission power, and transmits on each channel according to this power, and solves the robust optimal transmission power when the channel state information is uncertain, which can be used in cognitive network communication. In the present invention, under the condition of uncertain channel information, the maximum energy efficiency of the secondary user is guaranteed; the interference power to the receiving end of the primary user is strictly controlled, the service quality of the primary user is guaranteed, and the impact of information uncertainty is effectively eliminated. Deterioration of cognitive network performance.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method for robust energy-efficient transmission in a cognitive network. Background technique [0002] Cognitive radio networks allow secondary users to use the authorized spectrum of primary users to share spectrum without reducing the quality of service (QoS) of primary users, improving the utilization rate of the entire spectrum. On the other hand, the wireless transmission technology that maximizes energy efficiency has become a hot issue in green communication. In particular, in cognitive radio networks, how secondary users can maximize their own energy efficiency while improving spectrum utilization is a hot topic of current research. [0003] Most existing literature assumes that the channel state information CSI is accurate when maximizing the energy efficiency of secondary users. However, due to the time-varying characteristics of the wirele...

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a method for robust energy-efficient transmission in a cognitive network, aiming to solve the problem of secondary user energy efficiency caused by the existing method of maximizing energy efficiency in a cognitive radio network without considering channel information uncertainty. deterioration, reducing the quality of primary user service

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