Hi all,
Just wondering this question : How come nobody uses DTMF as digital network's keying ?
I think rather than QPSK, which can only transmit 2-bits at once, the DTMF can transfer up to 4-bits and it's proven to be very effective over copper wires.
I think if it is used over RF network, we can improve the network's throughput. Does anyone has experience with this ?
-kunil