Efficient implementation of multicarrier frequency hopping receiver via polyphase channelizer

摘要

The authors present an efficient signal processing algorithm for implementing a full digital multicarrier frequency hopping (MCFH) receiver. FH radios were, at the beginning, developed for military applications because of their characteristic of being highly jamming resistant. The proposed receiver architecture is based on non-maximally decimated filter bank (NMDFB) also known as polyphase channelizer which enables the functionality of simultaneously de-hopping multiple frequency-hopped spread spectrum (FHSS) signals at reduced sample rate. This feature greatly reduces the implementation cost as well as power consumption of a traditional analog based de-hopping circuit. Furthermore, the NMDFB based de-hopping circuit supports fast acquisition by means of conducting parallel search, which gives a much shortened synchronization time. After de-hopping, second tier NMDFBs are used as a bank of band pass filters (BPFs) to perform non coherent demodulation of the underlying M-ary frequency shift keying (MFSK) signal.