The power control algorithm of mobile cognitive users in cognitive radio

Abstract:

The traditional power control problems of cognitive radio are based on the situation that the position of cognitive user is unchanged. This paper has done a lot of work on the power control problems of mobile CR users. First of all, we analyze various communication situation and sort with normalization, establish general communication model which highly simplifies the interference estimation and power control algorithm; Secondly, according to the mobility of the CR users, the function expression of the interference of PR user, moving distance and the vector direction of CR user which realized the real-time prediction of interference from CR to PR users is deduced. Finally the power control of the cognitive users is realized according to the prediction result by minimum transmission power norm. The simulation result shows that the algorithm can control the transmitting power of CR users timely and efficiently which can save 20% for the power consumption compared with the fixed step power control algorithm.