Variable-bandwidth frequency division multiplex communication system
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United States of America Patent
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Jan 11, 2000
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N/A
app pub date -
Apr 15, 1997
filing date -
Apr 15, 1996
priority date (Note) -
Expired
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Abstract
A variable-bandwidth frequency-division multiplex communication system which needs no interpolation circuits, but uses switch element of simple structure. The system includes a signal combining circuit which has N A/D converters associated respectively with independent information signals to be transmitted, a complex local oscillator for generating complex signals each having a frequency k.DELTA.f (1.ltoreq.k.ltoreq.N-1), .DELTA.f being the channel frequency interval, N complex multipliers for multiplying the outputs of the A/D converters by the respective complex signals, and producing N output signals, a circuit for effecting an inverse Fourier transform of N points, an N.times.N switch circuit connected between the outputs of the complex multipliers and input terminals of the inverse Fourier transform circuit, N digital subfilters connected respectively to the outputs of the inverse Fourier transform circuit, N delay units connected respectively to outputs of the digital subfilters, and an adder for adding output signals from the delay units and outputting a sum signal.
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