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# VSB - the is where W f W f B v v T = VSB • The key to the...

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2/16/2010 1 Vestigial Sideband Modulation (VSB) Motivation: It is hard to implement a bandpass filter with sharp frequency cutoff; a phase shifter is realizable only approximately. Solution: VSB is relatively easy to generate and requires a bandwidth of 25% greater than that of SSB. DSB, SSB and VSB Figure 4.20 Spectra of the modulating signal and corresponding DSB, SSB, and VSB signals. VSB VSB differs from SSB in two respects: Instead of completely removing a sideband, a trace or vestige of that sideband is transmitted; Instead of transmitting the other sideband in full Instead of transmitting the other sideband in full, almost the whole of this second band is transmitted. The transmission bandwidth of a VSB signal is defined by bandwidth message the is and bandwidth vestige

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Unformatted text preview: the is where W f W f B v v T + = VSB • The key to the filter design is that the transmitted vestige must compensate for the distortion caused to the desired sideband. This is maintained by the following filter requirement: W f W f f H f f H c i c i ≤ ≤ − = + + + , 1 ) ( ) ( 2/16/2010 2 VSB Modulation and Demodulation VSB Shaping Filter VSB Shaping Filter There are two properties of the shaping filter: • The transfer function of the shaping filter exhibits odd symmetry about the carrier frequency f c. • The transfer function is required to satisfy the condition only for the frequency interval W f W ≤ ≤ − An Example Figure 4.22 VSB modulator and receiver filters....
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VSB - the is where W f W f B v v T = VSB • The key to the...

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