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(b) In a particular implementation of ADSL2+, 400 downstream subchannels are being used to achieve a data rate of 10.4 Mbit s-1. If 75 subchannels

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(b) In a particular implementation of ADSL2+, 400 downstream subchannels are being used to achieve a data rate of 10.4 Mbit s-1. If 75 subchannels are using 1024-QAM, 125 are using 64-QAM and 100 are using 16-QAM, what modulation scheme must the remaining channels use, assuming they all use the same scheme? Show all your workings

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