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which modulation scheme is used in PSTN network

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mfawan

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i want to know that which modulation schemes gives us best result in PSTN network if we use compression algorithms i.e. adpcm for noisy channel.

my channel is noisy. i want to use ADPCM for data compression and alone with this i want to check which modulation scheme will perform good (PSK, FSK or QAM)

plz guide me in better way
Regards
 

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