PROBLEMS IN GMSK The main lobe of MSK is wide. This makes MSK unsuitable for the applications where extremely narrow bandwidths and sharp cutoffs are required. Slow decay of MSK power spectral density curve creates adjacent...
Tag - Communications
The first operation in digital communications is the sampling. Almost all the natural signals exist in analog form. For example, voice, any moving scene, environmental data etc. exist in analog or continuous form. Such...
All the diodes exhibit small junction capacitance in the reverse biased condition. The varactor diodes are specially designed to optimize this characteristic. The junction capacitance of the varactor diode changes as the reverse...
The performance of a radio receiver is measured on the basis of its selectivity, sensitivity, fidelity and image frequency rejection. Selectivity The selectivity is the ability of the receiver to select a signal of a...
The problems of TRF receiver are overcome in this receiver. The superheterodyne receiver converts all incomming RF frequencies to a fixed lower frequency, called Intermediate Frequency (IF). This IF is then amplified and detected...
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...
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...
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...
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...
