A Bidirectional Cooperation Spectrum Access Method Based on Time and Bandwidth Allocation

In order to eliminate the interference between primary user (PU) and secondary user (SU) and improve the transmission performance of SU, this paper proposes a two-way cooperation spectrum access method based on time and bandwidth allocation. Specifically, SU uses part of the time and bandwidth to help forward PU’s signal and uses the remaining time and bandwidth to send its own signal, which maximizes SU’s transmission rate while guaranteeing the PU to achieve its target rate. Since PU and SU works on different authorized bandwidth, respectively, they will not interfere with each other. Both the analyses and numerical simulation results illustrate the performance of the proposed spectrum access method, not only the interference between PU and SU can be eliminated, but also SU gains maximum transmission rate. Besides, primary system obtains a better performance.