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...
Tag - Communications
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...
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...
We know that electromagnetic waves have two fields. One field is electric field and other is magnetic at 90°. The direction of propagation of those waves is perpendicular to both electric and magnetic fields. The electromagnetic...
Before discussing about modulation and demodulation directly, we will consider an interesting example first. Let us consider that you want to send some “parcel” from Pune to Nasik. It is obvious that the parcel cannot...
From the examples of communication discussed so far, now we can prepare the model of basic communication system. We know that for any communication to take place, three things are essential. They are, Transmitter...
What is Communication ? Communication is the process of establishing connection (or link) between two points for information exchange. In our day to day life we come across many ways of communicate. For communication to take...
Radio over Fiber Links One application of RF radio over fiber technology is in broadband wireless access networks for interconnecting antenna base stations (BSs) with the central controlling office. Image shows the basic network...
Analog Link In telecommunication networks the trend has been to analog link telephone exchanges with digital circuits. A major reason for this was the introduction of digital integrated-circuit technology which offered a reliable...
Penalty Power The analysis in this post assumed that the optical power falling on the photodetector is a clearly defined function of time within the statistical nature of the quantum detection process. In reality, a number of...
