Variable-bandwidth frequency division multiplex communication sy

Details Variable-bandwidth frequency division multiplex communication sy Variable-bandwidth frequency division multiplex communication sy

1997-04-15

2000-01-11

Hsu, Alpus H.

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

370484, 370497, 375261, H04J 104, H04J 118

Patent

active

060143665

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.

REFERENCES:
patent: 3706929 (1972-12-01), Robinson et al.
patent: 4103110 (1978-07-01), Picquendar et al.
patent: 5058107 (1991-10-01), Stone et al.
patent: 5251218 (1993-10-01), Stone et al.
patent: 5657313 (1997-08-01), Takahashi et al.
patent: 5732068 (1998-03-01), Takahashi et al.
patent: 5822323 (1998-10-01), Kaneko et al.

Affiliated with

Also associated with

Rating

Variable-bandwidth frequency division multiplex communication sy does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Variable-bandwidth frequency division multiplex communication sy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable-bandwidth frequency division multiplex communication sy will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1467541