Multiplex communications – Wide area network – Packet switching
Patent
1977-11-07
1980-04-22
Claffy, Kathleen H.
Multiplex communications
Wide area network
Packet switching
370 23, H04J 100
Patent
active
041996607
ABSTRACT:
A FDM/TDM transmultiplexer uses sampling rate multiplication to increase the sampling rate for time division multiplexed (TDM) to frequency division multiplexed (FDM) conversion and decrease the sampling rate for FDM to TDM conversion. The rate multiplication filters are realized digitally in order to exploit the computational advantage of Fast Fourier Transform (FFT) algorithm, and channel filtering is implemented by a single time-shared sixth-order elliptic digital recursive filter. A novel FFT processor and recursive filter are disclosed which may be used in the system.
REFERENCES:
patent: 4013842 (1977-03-01), Kao et al.
patent: 4075429 (1978-02-01), Takahata
IEEE Conference on Communications, Freeny et al., "An Exploratory Terminal for Translating Between Analog Frequency Division and Digital Time Division Signals", Jun. 1971, pp. 22-31 to 22-36.
R. L. Greenspan et al., "Channel Demultiplexing by Fourier Transform Processing", Eascon 1974 Record, pp. 369-372.
P. M. Terrell et al., "A Digital Block-Processor for SSB-FDM Modulation and Demodulation", IEEE Transactions on Communications, Feb. 1975, pp. 282-286.
S. L. Freeny et al., "Systems Analysis of a TDM-FDM Translator/Digital A-Type Channel Bank", IEEE Transactions on Communications Technology, vol. Com-19, Dec. 1971, pp. 1050-1059.
T. M. Claasen et al., "A Generalized Scheme for an All Digital Time Division Multiplex to Frequency Division Multiplex Translator", IEEE National Telecommunications Conference, Dec. 1977.
Ali Mian Z.
Burwell Clyde E.
Dill George D.
Fillion James R.
Jones Richard W.
Claffy Kathleen H.
Communications Satellite Corporation
Popek Joseph A.
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