A new frequency synthesizer for coherent communication in frequency hopping spread spectrum multiple access communication systems

In Spread Spectrum Multiple Access (SSMA) communications systems, the narrow band information spectrum is uniformly spread over the communication bandwidth, and plural communication parties share the same frequency band at the same time. Frequency-Hopping SSMA (FH-SSMA) involves the generation of pseudonoise signals, for spectrum spreading of the information signal, by means of a frequency synthesizer. Conventional frequency synthesizers, howewver, cannot generate pseudonoise signals having the same phase and frequency, in the corresponding time slot at the transmitter and receiver sides, independently. This renders coherent detection impossible. Attention is presently given to the design of a novel frequency synthesizer for coherent FH-SSMA coherent communications.