ECE :: Communication Systems
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A narrow band noise n(t) has symmetrical spectrum and has power density spectrum 0.2 x 10-6. The power density of quadrature component is
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The radio receivers mostly used now a days are
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The reactance of coupling capacitors, for DC quantities, is
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An AM wave is given by s(t)AM = 20 (1 + 0.5 cos 103t + 0.3 cos 104 t cos 106 t) the modulation index of the envelope is
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The modulating frequency in frequency modulation is increased from 10 kHz to 30 kHz. The bandwidth is increased by
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A sinusoidal signal with peak to peak amplitude of 1.536 volt is quantized into 128 levels using a mid-rise uniform quantizer. The quantization noise power is
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An FM wave is made to pass through a frequency tripler. If original modulation index is mf, the output of tripler has a modulation index equal to
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If γ = (S0/N0)/(Si/Nm) where S0 and S1 are signal power output and signal power input and N0 and Nm are noise power output and noise power input, the value of γ for SSB-SC and DSB-SC amplitude modulated system respectively are
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Consider the draw backs
- Slope overload
- Serration noise
- Granular noise
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