Title :
Matched frequency-hopping (MFH) signals for slowly fading dispersive channels
Author :
El-Khamy, Said E.
Author_Institution :
Dept. of Electr. Eng., Alexandria Univ., Egypt
fDate :
2/1/1998 12:00:00 AM
Abstract :
The design of channel-matched frequency-hopping (MFH) spread-spectrum signals that overcome the performance degradation caused by the channel dispersion is described. In MFH systems, the used frequency slots are selected such as to correspond to maximum transmission through the communication channel. This is affected by adapting the MFH signals so that the probability density function (PDF) of hopped frequencies matches the transfer function of the communication channel. The performance of MFH signals in multipath slowly fading dispersive channels is evaluated, using a generalized bandpass two-path transfer function model. The performance is compared with that of frequency-hopping (FH) signals with uniformly distributed frequencies for different scenarios of channel parameters. The results clearly show the advantages of MFH transmission
Keywords :
digital radio; fading; frequency hop communication; frequency shift keying; multipath channels; probability; spread spectrum communication; transfer functions; FSK; PDF; channel dispersion; channel parameters; channel-matched frequency-hopping; communication channel; digital radio; frequency slots; generalized bandpass two-path transfer function; matched frequency-hopping signals; maximum transmission; multipath channels; performance degradation; probability density function; slowly fading dispersive channels; spread-spectrum signals; uniformly distributed frequencies; Communication channels; Dispersion; Equalizers; Fading; Frequency modulation; Frequency shift keying; Intersymbol interference; Signal design; Spread spectrum communication; Transfer functions;
Journal_Title :
Vehicular Technology, IEEE Transactions on
