Method for FDMA signal multiplexing and demultiplexing

Details Method for FDMA signal multiplexing and demultiplexing Method for FDMA signal multiplexing and demultiplexing

1993-03-01

1994-03-08

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 70, 36472413, 364726, H04J 105

Patent

active

052933822

ABSTRACT:
A method for multiplexing a series of frequency division multiple access (FDMA) signals includes providing complex channels offset relative to the FDMA signals. Each FDMA signal is filtered to be centered and occupy one-half of the bandwidth of each complex channel, leaving an "off" channel between each pair of successive FDMA signals. The real part of the multiplexed output signal is processed and higher frequency signals of FDMA signals image into the "off" channels. Demultiplexing includes aligning a demultiplexing channelization pattern with the multiplexed input signal contained in input channels. The input channels are one-half a bandwidth of each of the complex channels. The input channels contain a sequence of FDMA signals separated by a reverse sequence of images of the FDMA signals. Consecutive even-numbered input channels correspond to consecutive complex channels of the complex channels and the sequence of FDMA signals can be extracted from the complex channels.

REFERENCES:
patent: 4107470 (1978-08-01), Maruta
patent: 4300229 (1981-11-01), Hirosaki
patent: 4792943 (1988-12-01), G uml/o/ ckler
An article entitled "Multirate Digital Signal Processing " by R. E. Crochiere et al, AT&T Acoustics Research Department, Bell Laboratories, Murray Hill, N.J., Prentice-Hall, Inc., Englewood Cliffs, N.J. 07632, pp. 289-310 and 356-376. 1983.

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