Title :
Multiuser performance comparisons of fast frequency hopping and multicarrier slow frequency hopping systems: uncoded and coded schemes
Author :
Yazdi, Zolfa Zeinalpour ; Nasiri-kenari, Masoumeh
Author_Institution :
Dept. of Electr. Eng., Sharif Univ. of Technol., Tehran, Iran
Abstract :
We evaluate and compare the multiuser performance of fast frequency-hopping (FFH) and multicarrier slow frequency-hopping (MC-FH) systems employing noncoherent detection for both uncoded and coded schemes in AWGN and slowly frequency-selective Rayleigh fading channels, based on a Gaussian distribution assumption for the decision variable. Our numerical results indicate that with noncoherent detection, both systems show the same performance. However, the MC-FH system can be easily implemented using an FFT algorithm. Furthermore, with a slow hopping rate and high number of carriers, coherent detection for the MC-FH system is feasible. Our results indicate that, for this system (MC-FH), coherent detection substantially outperforms noncoherent detection for both uncoded and coded schemes.
Keywords :
AWGN channels; Gaussian distribution; Rayleigh channels; encoding; fast Fourier transforms; frequency hop communication; frequency shift keying; multiuser detection; AWGN channels; BFSK modulation; FFT algorithm; Gaussian distribution; MUD; Rayleigh fading channels; coded schemes; coherent detection; fast frequency hopping; frequency-selective channels; multicarrier slow frequency hopping systems; multiuser detection; multiuser performance; noncoherent detection; uncoded schemes; AWGN; Binary phase shift keying; Fading; Frequency diversity; Gaussian distribution; Interference; Jamming; Performance analysis; Protection; Spread spectrum communication;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th
Print_ISBN :
0-7803-8521-7
DOI :
10.1109/VETECF.2004.1400367