Title :
Frequency-hopped multi-user chirp modulation (FH/M-CM) for multipath fading channels
Author :
El-Khamy, Said E. ; Shaaban, Shawki E. ; Thabet, Essam A.
Author_Institution :
Dept. of Electr. Eng., Alexandria Univ., Egypt
Abstract :
The multi-user chirp modulation (M-CM) technique was introduced previously by the author as an efficient multiple-access technique using chirp modulation spread-spectrum signals. To further improve the performance of M-CM in multipath dispersive channels we suggest the application of frequency hopping (FH) to M-CM. The band of M-CM multiplexed signals is frequency-hopped within the allowed channel bandwidth. The application of FH is shown to highly improve the performance of M-CM signals in multipath fading dispersive channels. The considered channel model is a generalized channel model that allows dispersion and flat fading due to multipath propagation. Closed form expressions for the upper bound on the error probability for FH/M-CM is derived and investigated for different cases of channel dispersion and multiple-access parameters
Keywords :
chirp modulation; dispersive channels; error statistics; fading channels; frequency hop communication; multi-access systems; multipath channels; multiuser channels; spread spectrum communication; FH/M-CM; M-CM multiplexed signals; channel bandwidth; closed form expressions; error probability; flat fading; frequency-hopped multi-user chirp modulation; generalized channel model; multipath fading dispersive channels; multipath propagation; multiple-access parameters; multiple-access technique; performance; spread-spectrum signals; upper bound; AWGN; Bandwidth; Chirp modulation; Dispersion; Error probability; Fading; Frequency; Interference; Spread spectrum communication; Upper bound;
Conference_Titel :
Radio Science Conference, 1999. NRSC '99. Proceedings of the Sixteenth National
Conference_Location :
Cairo
Print_ISBN :
977-5031-62-1
DOI :
10.1109/NRSC.1999.760890
