Power Allocation Method for Robust Cognitive Communication System Based on Cooperative Relay

Abstract

The invention discloses a method for allocating power in a robust cognitive communication system based on cooperative relay, which includes a communication model establishment step for establishing a cooperative relay communication model by using a cognitive user as a relay node of an authorized user, and based on the The cooperative relay communication model establishes an optimization model with constraints with the objective function of minimizing the bit error rate of the communication system; in the power allocation step, when the channel state information is known, the Lagrangian dual algorithm and the KKT condition are used Obtain the optimal transmission power of the cognitive user, and calculate the transmission capacity of the cognitive communication system; when the transmission power of the authorized user transmission end is constant, adjust the transmission power of the relay node to meet the requirements of the bit error rate of the communication system. The power allocation method of the communication system effectively improves the overall communication performance and the bit error rate of the authorized user communication in the model, and introduces a time-varying interference threshold protection factor to ensure that the entire communication system has better robustness.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a power allocation method for a robust cognitive communication system based on cooperative relay. Background technique [0002] In the context of the "Internet of Things +" era, with the rapid popularization of Internet technology, smart terminal equipment, big data, and cloud computing technology and the explosive growth of communication traffic, the idle spectrum resources available in wireless communication have become particularly important. nervous. In the existing wireless communication spectrum management mechanism, only authorized users have the right to use spectrum resources for communication transmission, but unlicensed communication users cannot use them. This kind of spectrum management rule is not reasonable at present with the rapid development of wireless communication technology. Part of the licensed spectrum is idle most of the time a...

AI Technical Summary

Problems solved by technology

In the green cooperative communication system combined with cognitive radio, a problem worthy of research is how to allocate power to unlicensed users (ie, cognitive users). The code rate is the target, and it is not fully considered that in the actual communication network, there are disturbances in parameters such as channel gain, which has uncertainty problems

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