Multiplex communications – Wide area network – Packet switching
Patent
1981-07-13
1983-10-25
Brigance, Gerald L.
Multiplex communications
Wide area network
Packet switching
370 50, 370 23, H04J 400
Patent
active
044123256
ABSTRACT:
The equipment disclosed in the present invention provides means for SSB multiplexing and demultiplexing base-band signals, equal in number to a power of two, digital signal processing techniques. The frequency modulation process of the base-band signals is partly performed with a discrete Fourier Transform (D.F.T.), the dimension of which is appreciably reduced with respect to the number of signals to be multiplexed, and partly with modulators (multipliers), some of which are of simple construction and which are fewer in number than the number of signals to be multiplexed. Filtering is effected with a set of filters with different frequency repetition periods and which, when cascade connected, from a pass-band filter equal to the frequency band which characterizes every base-band signal. The frequency repetition period of the entire filter is equal to the sampling frequency of the multiplexed signal.
REFERENCES:
patent: 4013842 (1977-03-01), Kao et al.
patent: 4131764 (1978-12-01), Claasen et al.
patent: 4131766 (1978-12-01), Narasimha
patent: 4199660 (1980-04-01), Dill et al.
patent: 4241443 (1980-12-01), Sakaki et al.
patent: 4300229 (1981-11-01), Hirosaki
patent: 4316282 (1982-02-01), Macina
"An Improved Method for Digital SSB-FDM Modulation and Demodulation", Maruta et al., IEEE Trans. on Comm., vol. COM-26, No. 5, May 1978, pp. 720-725.
Brigance Gerald L.
Telettra Telefonia Elettronica e Radio S.p.A.
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