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

The application of multilevel frequency-shift keying/frequency-hopping spre ad-spectrum multiple access (MFSK/FH-SSMA) to wireless systems has been rec eiving attention recently. Most studies on MFSK/FH-SSMA wireless systems so far assume to support only one type of medium, A flexible support of multi media services in future wireless systems is expected. However, the use of conventional "fixed-length" FH patterns alone cannot serve these multirate multimedia wireless systems. In this paper, a family of double-length fixed -weight generalized prime hopping patterns is reviewed. These FH patterns h ave cross correlations of no greater than one in order to minimize mutual i nterference and are well suited for wireless systems with double-media serv ices. The performances of the prime hopping patterns and conventional rando m hopping patterns in MFSK/FH-SSMA wireless systems over Rayleigh fading an d additive white Gaussian noise (AWGN) channels are analyzed and compared f or one type of medium first and extended to two types of media. Our results show that the proposed scheme performs better than the conventional one wi th random hopping patterns in both nonfading and fading channels.