Isolation-based uplink power control for TD-LTE in TV White Space

In order to utilize TV White Space (TVWS) by deploying the cognitive radio technology and eliminate interference to digital television (DTV) system, some researches set extra isolation which may reduce spectrum efficiency. In this study, power control is used. However, the existing TD-LTE power control algorithms are not proper for the coexistence of TD-L TE and DTV systems because the interference is not considered. A novel power control algorithm, Isolation-based Power Control Algorithm (IPCA), is proposed. Different from conventional Open-Loop Power Control (OLPC), IPCA sets target signal-to-interference-and-noise (SINR) for each user based on its isolation from DTV receiver because isolation between these two systems plays an important role in interference. Then the optimization problem of the parameter in IPCA is solved by Lagrangian multiplier method. The simulation result shows that IPCA can not only reduce the interference from TD-LTE to DTV, but also improve spectrum efficiency.