IQ Modulation A sender is using IQ modulation. How does a receiver decode the I and Q quantities? a. Multiply the received signal by the sine and cosine function b. Use a 4B/5B table c. Multiply the received signal by sine and tangent function d. Multiply the received signal by the sine function only e. By looking up a constellation diagram The correct answer is: Multiply the received signal by the sine and cosine function
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For the modulated signal x(t) = m(t) * cos(2Ď€fct), the message signal m(t) = 4cos(100Ď€nt) and the carrier frequency fc is MHz. The signal x(t) is passed through a demodulator, as shown in the figure below. The output M(t) of the demodulator is: Ideal LPF with cut-off 510 Hz y(t) x(t) cos(2Ď€(fc - 40)t) (a) cos(100Ď€nt) (c) cos(920Ď€nt) (b) cos(540Ď€nt) (d) cos(460Ď€nt)
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