Terrestrial-Satellite Secure Communication with Non-confidential User Assistance and Hybrid-Power

In this paper, we propose a novel secure communication method for terrestrial-satellite system called hybrid-power communication. Hybrid-power communication, which belongs to physical layer security technology, not only eliminates the need for spread spectrum technology, but also is compatible with spread spectrum technology. Compared with artificial noise, hybrid-power communication method ensures the security of confidential user more efficiently, utilizing non-confidential users whose communication has no need to be encrypted. By allocating different power to the signals in accordance with hybrid-power factors, secure communication is achieved. Hybrid-power communication is able to improve the security of confidential user at a very low cost without affecting the communication performance of non-confidential user. In the last place, the simulation verifies our conclusion that compared with other available technologies, with the communication performance guaranteed, hybrid-power technology can effectively improve the security of the physical layer with the assistance of non-confidential user, while only costs tolerable resource loss and hardware requirements.