Modulation-based Collaboration
Truc Thanh Tran, Ngô Văn Sỹ, Gia Nhu Nguyen · 2015
This article proposes a type of cooperative spectrum sharing in which the secondary signal does not cause any degradation in the primary signal. Consequently, the performance of the primary user system when the simultaneous spectrum sharing occurs is the same as when the secondary user system collaborates with the primary user system without accessing the primary user's spectrum for the secondary usage. This simplifies the spectrum management because the interference constraint is not necessary. The investigation is limited to the application of the quadrature amplitude modulation (QAM) alphabet and the decode and forward protocol. The symbol error rates (SERs) are considered as the merit for evaluating the performance of the PU and SU systems. They are theoretically analyzed and its agreement with the practice is examined by simulation.