ELL727 weekly quiz-7

The spectral efficiency (in bps/Hz) of minimum-shift orthogonal binary FSK using zero-ISI Nyquist (sinc) pulses is

• 1/2

• 2/3

• 3/2

• 2

The spectral efficiency (in bps/Hz) of 4-ASK using raised-cosine pulses with maximum roll-off factor (r = 1) is

• 0.5

• 1

• 1.5

• 2

The constellation diagram of QPSK and 4-QAM are the same except for a global rotation by

• 22.5^o

• 45^o

• 60^o

• 90^o

If P(A) = 0.9 and P(B) = 0.8, then the minimum possible value of P(A⋂B) is

Hint: Use Venn diagram

A binary source generates bits 1 and 0 with probabilities 0.9 and 0.1 respectively. The chance of two 1s and a 0 being present in a 3-bit sequence is close to

• 10%

• 25%

• 50%

• 90%