Differential Frequency Hopping Systems Using Soft Decision Viterbi Decoding Algorithm

Differential frequency-hopping (DFH) technique has been widely studied and applied in the military communications due to its many desirable features, such as reliable high data rate transmission characteristics, anti-jamming abilities and information security. In order to improve the information security of the conventional DFH systems, a novel DFH system with the G-function controlled by the well-known maximal length sequences, is proposed in this paper. In addition, both BCH code and soft decision Viterbi algorithm are also used in the proposed scheme to further improve the system performance. Our results show that the proposed scheme not only provides the higher information security but also improves the system performance indeed, compared to the conventional schemes.