Method for FDMA signal multiplexing and demultiplexing
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United States of America Patent
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Mar 8, 1994
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N/A
app pub date -
Mar 1, 1993
filing date -
Mar 1, 1993
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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.
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