The message signal generated from the information source is also called baseband signal. The baseband signal can be a combination of two or more message signals. If the baseband signal is transmitted directly, then it is called baseband transmission. Thus baseband transmission does not use modulators and demodulators. The baseband signal can be both analog
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As we have seen in the preceding sections, the connection between transmitter an the receiver is established through communication channel. We have seen that communication can take place through wirelines, wireless or fibre optic channels. other media such as optical disks, magnetic tapes and disks etc. can also be called as communication channel, because they
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Fig shows the basic elements of a digital communication system. The source and the destination are the two physically separate points. When the signal travels in the communication channel, noise interferes with it. Because of this interference, the smeared or disturbed version of the input signal is received at the receiver. Therefore the signal received
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