A guard band aggregation scheme for cognitive radio using TV white space

Cognitive radio based wireless systems using TV white space have been attracting a lot of attentions. In the cognitive radio systems using TV white space, it is desirable to secure a control channel to exchange the information on the availability of white space and the frequency resource such as the frequency channel and the bandwidth. In addition, it is necessary to secure minimum frequency resource for communications if TV white space is unavailable even though TV white space is used on an opportunistic basis. In order to solve these problems, this paper proposes a guard band aggregation scheme, which aggregates the multiple guard bands between digital TV signals and uses them for a control channel and/or a communication channel. This paper shows the performance evaluation results of the digital TV signals when the guard band is used by the proposed scheme. Furthermore, it discusses the permissible transmitting power and occupied bandwidth to avoid the performance degradation of the digital TV signals.