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* FSK is less susceptible to errors and interference than ASK because interference is often confined to a specific frequency.
* PSK is the least susceptible to error of these three. In terms of bit error rate (BER), binary PSK is about twice as good as ASK and FSK in the presence of noise, and the BER can be significantly improved through other techniques.
*OFDM can also be used. It is very spectrally efficient.<ref>https://space.stackexchange.com/questions/15428/what-is-the-advantage-of-qpsk-over-fsk-or-ask-for-satellite-data-transmission</ref>
For analog communication in general:
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== References==