HYBRID DS/FH TWO-LEVEL CODE ACQUISITION OF FREQUENCY HOPPING RADIO IN RAYLEIGH FADING CHANNEL

摘要

A method for very long pseudonoise (PN) code acquisition of frequencyhopping (FH) radio is presented and analyzed. This method is realized through twolevels: (1) acquisition of preamble, which consists of several short PN codes (syncprefixes) modulated by using direct sequence (DS) technique, and (2) long PN codesynchronization of FH signal checking out. This scheme at the receiving side uses a set ofpassive correlators and a bank of active correlators. Some numerical results ofacquisition performance measures in Rayleigh fading channel are presented.