Performance comparison between FH-FDMA and FHMA systems under the worst case band multitone jamming

The bit error rate (BER) performance of a fast frequency-hopped (FH) frequency division multiple access (FDMA) system is evaluated under the environment with band multitone jamming (MTJ), with the clipper receiver and the normalized envelope detection (NED) receiver as combining alternatives. As the number of groups increases at the cost of system complexity, eventually becoming a FHMA system, the worst case performance of FH-FDMA with the clipper receiver is gradually improved, while that of the NED receiver is hardly improved when SJR is less than 10 dB. Although the clipper receiver has a practical disadvantage because the clipping level depends on measurements of the signal output energy, the FHMA system with the clipper receiver can be an effective solution among the FH-FDMA systems in the presence of worst case band MTJ if a clipping level can be feasibly set.