2-AMPS cellular channels work over 30 KHz bandwidths, and work at SNR's of 18 dB.

a) What is the maximum capacity possible, according to Shannon?

b) Those channels have typically not been used for data, but only voice. Still, some use of those channels for data (like signaling) have typically only provided at most ten to twenty kilobits per second. Speculate (or explain) why that is so much lower than the Shannon capacity?

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