A serial bit stream, proceeding at a rate of 10 kbps from a source, is given as

110110 010111 011011 (spacing for clarity)

Number the bits from left to right starting with 1 and going through 18 for the right-most bit. Associate the odd indexed bits with d₁ (t) and the even-indexed bits with d₂ (t) in Figure 10.1.

(a) What is the symbol rate for d₁ or d₂?

(b) What are the successive values of θ_i given by (10.2) assuming QPSK modulation? At what time intervals may θ_i switch?

(c) What are the successive values of θ_i given by (10.2) assuming OQPSK modulation? At what time intervals may θ_i switch value?

dz(t) +1 +A d(t) Adz(1) sin @t +1 S+1 |dz(1) = - |A sin mt Serial to Ad (1) cos wt - Ad,(1) sin w parallel converter 1 d(t) = 90 S+1 )={| A cos ai d,(1) = Ad (t) cos wI (1)\p +1 +A -1 -A