Solucionario Sistemas De Comunicaciones Electronicas 4ta Edicion Wayne Tomasi34 →

Coherent digital modulation uses a reference carrier signal at the receiver to detect the transmitted signal, while noncoherent digital modulation does not use a reference carrier signal.

2.2 Determine the power spectral density of a random signal. Coherent digital modulation uses a reference carrier signal

Solution:

f_USB = f_c + f_m = 100 kHz + 5 kHz = 105 kHz f_LSB = f_c - f_m = 100 kHz - 5 kHz = 95 kHz Coherent digital modulation uses a reference carrier signal

S(f) = lim (T → ∞) [1/T * E^2]

Solution:

1.1 Explain the difference between electronic communication and communication systems. Coherent digital modulation uses a reference carrier signal