Tag: ana-digi-comm-haykin-2nd
Amplitude-modulated Wave s(t) = A_c[1 + k_am(t)](2 f_c t) = [1 + k_am(t)]c(t) (3.2) m(t) is the message or information-bearing signal c(t) = A_c(2 f_c t) is the carrier wave A_c|1 + ...
Welcome to a look into a piece of my mind, or rather my second mind. I’m a 3rd year Engineering Science student at the University of Toronto majoring in Electrical & Computer Engineering and minoring in Robotics and Artificial Intelligence.
Transmitter Recall that AM is power and bandwidth inefficient, DSB-SC attempts to be more power efficient. Note: Similar to AM, bandwidth of the message for DSB-SC (W) is expected to be much smaller than f_c, that is: BW = W << f_c This is so that, in the frequency domain, when the cosine doubles the message, they don’t overlap The Envelope doesn’t follow the message Notice: We get phase reversals because the original message not everywhere positive, so the envelope (dashed line), doesn’t follow the message.
This receiver corrects for a changing phase shift in Double Sidebar Suppressed Modulation Recall that in the non-ideal case: We can also say: *Product modulator is just the multiplication ...
SSB Modulation attempts to be power efficient and bandwidth efficient, but it’s limited in use cases. It was originally designed for voice signals (telephones), this is because they have a unique structure with a small energy gap around 0 frequency.
Properties of The Fourier Transform Linearity (Superposition) Let g_1(t) G_1(f), g_2(t) G_2(f), then c_1, c_2 : c_1 g_1(t) + c_2 g_2(t) c_1 G_1(f) + c_2 G_2(f) (2.14) Proof From the ...
Fourier Transform (Analysis Equation) The Fourier transform will Uniquely define G(f) G(f) = \{g(t)\} = _{-}^ g(t) (-j2 f t) dt (2.1) For a non-periodic g(t) ...