MFSK/FH-SSMA wireless systems with double-media services overfading channels

摘要

The application of multilevel frequency-shiftnkeying/frequency-hopping spread-spectrum multiple access (MFSK/FH-SSMA)nto wireless systems has been receiving much attention. Most studies onnMFSK/FH-SSMA wireless systems so far assume to support only one type ofnmedium. A flexible support of multimedia services in future wirelessnsystems is expected. However, the use of conventionaln“fixed-length” FH patterns alone cannot serve thesenmultirate multimedia wireless systems. A family of double-lengthnfixed-weight generalized prime hopping patterns is reviewed. These FHnpatterns have cross correlations of no greater than one in order tonminimize mutual interference and are well suited for wireless systemsnwith double-media services. The performances of the prime hoppingnpatterns and conventional random hopping patterns in MFSK/FH-SSMAnwireless systems over Rayleigh fading and additive white Gaussian noisen(AWGN) channels are analyzed and compared for one type of medium firstnand extended to two types of media. Our results show that the proposednscheme performs better than the conventional one with random hoppingnpatterns in both nonfading and fading channels