Abstract
AbstractIt has been considered impossible to demodulate a fast frequency‐hopping (FFH) spread‐spectrum signal coherently in a frequency selective fading channel as a result of difficulties with making the receiver local oscillator track the phase of a received signal that lacks phase continuity. This paper proposes a coherent demodulator for both FFH‐PSK (phase‐shift keying) and FFH‐FSK (frequency‐shift keying) signal employing a method in which the received signal is noncoherently down‐converted and phase‐adjusted by an adaptive algorithm.Computer‐simulations show that performance is better than in the case of noncoherent demodulators and that the interference‐rejection effect of the adaptive algorithm produces strong protection against interferences from other CDMA users.
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