There is no opportunity to exploit orthogonality
with M-ary ASK symbol sets and so there is an immediate penalty in BER performance as we
move up from the binary system.
The relatively poor BER results for M-ary ASK, coupled with its sensitivity to any gain
variations in the channel and the need for reasonable linearity in the transceiver
processing, means that there are very few practical examples of ASK other than in its
binary form.
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