Efficient Fine Synchronization for Coherent Fast Frequency Hopping

Improvements in hardware allow coherent fast frequency hopping (CFFH), enabling tight synchronization and reducing combining losses between hops. To achieve coherence, the timing and frequency offsets must be estimated, but existing solutions are either too complex or perform poorly in low SNR. We propose a noise-robust, low-complexity time-frequency estimation method based on rank-1 lattice sampling for CFFH. The hop sequence design and processing results in a fraction of complexity over existing methods. The tradeoff between complexity and performance is discussed.