| Frequency
Division Multiplexing (FDM) |
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| – | idea:
divide transmission frequency range into |
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| narrower
bands (subchannels) |
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| – | used
widely in telephone, microwave, CATV, satellite |
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| n | frequency
division duplex: use two subchannels for |
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| communication,
one for uplink, one for downlink (AMPS) |
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| n | time
division duplex: use same subchannel for both directions, |
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| take
turns |
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