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For a digital communication system, (i) if the energy per bit is 12 dB and the...

For a digital communication system,

(i) if the energy per bit is 12 dB and the noise level is 8 dB, what is the spectral efficiency?

(ii) If the channel bandwidth increases, what will happen to the spectral efficiency and Eb/N0.

(iii) In a binary communication system with an asymmetric transmitter, bits 0 and 1 are generated with 0.4 and 0.6 probabilities respectively. The receiver receives the bit stream of data through a noisy channel with the noise mean of zero and variance of 0.2. If the bit amplitudes for 1 and 0 are respectively 0.75 and -0.75, what will be the BER.

**** WOULD YOU PLEASE HELP TO DESCRIBE WHY THAT FORMULA WAS WRITTEN STEP BY STEP******** THANK YOU.

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