Double Side Band Amplitude Modulation-Communication Systems-Lecture Slides, Slides of Data Communication Systems and Computer Networks

Download Double Side Band Amplitude Modulation-Communication Systems-Lecture Slides and more Slides Data Communication Systems and Computer Networks in PDF only on Docsity! Previously Double Side-band Amplitude Modulation Advantages & Disadvantages?? High Bandwidth Non-coherent DSB AM Modulator is power inefficient but is used in Broadcasting applications Coherent DSB AM is costly for broadcasting applications docsity.com Single Side-band Amplitude Modulation Advantages & Disadvantages?? Reduced Bandwidth (Only Advantage) Non-coherent SSB AM Modulator is highly power inefficient Coherent SSB AM is costly for broadcasting applications Phase shift networks are approximately realizable for a finite frequency components not for the whole band of continuous spectrum Selective filtering requires DC null at the base band docsity.com docsity.com Example The carrier frequency of a certain VSB signal is @, = 20 kHz, and the baseband signal bandwidth is 6 kHz. The VSB shaping filter H,(w) at the input, which cuts off the lower sideband gradually over 2 kHz, is shown in Fig. 4.23a. Find the output filter H,(w) required for distortionless reception. ® docsity.com 4.6-1 A vestigial filter H;(@) shown in the transmitter of Fig. 4.22 has a transfer function as shown in Fig. P4.6-1. The carrier frequency is f. = 10 kHz and the baseband signal bandwidth is 4 kHz. Find the corresponding transfer function of the equalizer filter H{,(w) shown in the receiver of Fig, 4.22. H;(@) 2 docsity.com