JohnLai
Junior Member level 3
Hi,
I am reading Behzad Razavi's "Design of Integrated Circuits for Optical Communication". In Eq. (2.2), it describes the power spectrum of a random binary bit sequence as,
Sx(f) = (1/Tb) * |P(f)|^2,
where x(t) = Σ bk * p(t-k*Tb) for bk = ±1 and P(f) = Tb*sinc(f*Tb)
Since x(t) toggles between +1 and -1 with equal probability. The DC component should be zero. But from the above equation, P(f) is a sinc function and contains non-zero value at DC.
Do you know know how to explain this discrepancy.
Thanks.
I am reading Behzad Razavi's "Design of Integrated Circuits for Optical Communication". In Eq. (2.2), it describes the power spectrum of a random binary bit sequence as,
Sx(f) = (1/Tb) * |P(f)|^2,
where x(t) = Σ bk * p(t-k*Tb) for bk = ±1 and P(f) = Tb*sinc(f*Tb)
Since x(t) toggles between +1 and -1 with equal probability. The DC component should be zero. But from the above equation, P(f) is a sinc function and contains non-zero value at DC.
Do you know know how to explain this discrepancy.
Thanks.
