One Joint Demodulation and Despreading Algorithm for MOD5
نویسندگان
چکیده
IFF determines the response properties of the target to identify friend or foe through question and answer mechanism, and nowadays it plays an important role in the modern information warfare. This paper introduces the transponder digital processing system in the new type of IFF, specially including the processing method of receiving and transmitting in MOD5 and the theory of basic MSK modulation, maximum likelihood Viterbi demodulation and Walsh spreading and despreading, discussing the shortage of maximum likelihood Viterbi demodulation, then proposing the weighted MSK demodulation and despreading algorithm and joint demodulation and despreading algorithm based on the improved maximum likelihood Viterbi demodulation algorithm. The joint demodulation algorithm is more outstanding than the maximum likelihood Viterbi demodulation algorithm according to simulation.
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