Differential game-based cognitive radio (CR) system power control method

Abstract

The invention relates to the field of cognitive radio (CR) and cellular mobile communication, in particular to a differential game-based CR system power control method. The control method comprises the following steps of: 1) constructing a CR system model; 2) designing a power extraction cost function and a power radiation hazard cost function; 3) constructing a power control differential game model; and 4) resolving feedback Nash equilibrium. In the method, the dynamic property of time continuity of an actual CR system is described well, a non-cooperative differential game model for controlling CR system power is established, a differential game-based distributed non-cooperative power control method is provided, and a feedback Nash equilibrium analytic solution is acquired. Through power control in a distributed non-cooperative power cognitive differential game (DNPCDG) algorithm, interference among cognitive users is effectively suppressed, so that total throughput is increased, and system performance is improved.

Description

technical field [0001] The invention relates to the field of cognitive radio and cellular mobile communication, in particular to a differential game-based cognitive radio system power control method. Background technique [0002] With the rapid development of wireless communication technology, the demand for wireless spectrum resources in communication systems is also increasing, and the scarce spectrum resources can no longer meet the growing demand. It can be seen from some research results in recent years that the lack of spectrum resources is more caused by the existing spectrum management and allocation strategies. Most of the existing spectrum management and allocation strategies are based on static control models, that is, the management organization divides the available spectrum resources into fixed, non-overlapping spectrum blocks, and these spectrum blocks are fixed in size and divided by guard bands. Assigned to different services and technologies in an exclusiv...

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Problems solved by technology

Spectrum management is very simple in this statically controlled allocation method, but a large number of measurement data show that its spectrum utilization rate is quite low. Taking the United States as an example, below 3GHz, the utilization rate of the allocated spectrum varies with time and geographical location from 15% to 85%, resulting in time and space spectrum hole (spectrum hole)

In addition, the Industrial Scientific and Medical (ISM) frequency band has also begun to implement an open spectrum utilization strategy, which has brought a variety of important emerging technologies and technological innovations. However, due to the interference between various heterogeneous networks , so that the spectral efficiency of the ISM band is not too high

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