Protected tactical waveform (PTW) provides cost-efficient, jamming-resistant communications via both government and commercial satellites over multiple frequency bands such as the C-, Ku-, Ka-, and X-band. Frequency hopping (FH) was originally developed for secure communications by exploiting time-frequency diversity over a large spectrum. The anti-jamming feature of the frequency hopping technique helps communication systems improve the reliability of transmission. In this paper, we consider a secure channel group hopping (CGH) scheme in order to satisfy the needs of protected tactical satellite communication system. This scheme is proposed to ensure that each channel group hops to a new hopping spectrum in a pseudo-random manner during each hopping period, and different channel groups always transmit over non-overlapping frequency bands. Our analysis suggests that the proposed CGH scheme achieves collision-free frequency hopping among channel groups, such that a higher spectrum efficiency of the system can be obtained. Simulation results are provided to validate the performance of the proposed CGH scheme for PTW system.
展开▼
