A communication system uses QPSK using raised cosine filter with roll-off 0.5 to transmit a stream at the rate of 4 Mbps (Mega bits per second). a)

A communication system uses QPSK using raised cosine filter with roll-off 0.5 to

transmit a stream at the rate of 4 Mbps (Mega bits per second).

a) What is the required bandwidth? (2 Marks)

b) What is the Eb/N0 required to achieve a bit error probability of 10−6 ? (2

Marks)

c) If one uses a (127, 64) BCH code with t=10, what would be the required

Eb/N0 to achieve the same probability of error of 10−6 ? (3 Marks)

d) What is the coding gain at 10−6 in dB? (2 Marks)

e) What is the required bandwidth for the coded system? (1 Mark)