Variable dwell-time code acquisition for FFH/MFSK spread spectrum systems under band multitone jamming and white Gaussian noise

Variable dwell-time code acquisition based on multiple-dwell and novel sequential tests is investigated for fast frequency hopped MFSK systems under the effects of white Gaussian noise and band multitone jamming. 1- and 2-dwell tests are of particularly interest for the multiple-dwell tests for practical consideration. Numerical results show that (i) diversity with fast frequency hopping can significantly improve the acquisition performance for 1- and 2-dwell tests, especially in a heavily jammed environment, and (ii) the proposed novel sequential tests significantly outperform 1- and 2-dwell tests and are quite robust to the effects of non-ideal jammer state information. Our analytical results are verified by computer simulations