Communication Systems - MADE EASY Study Material for GATE, ESE and SES Exams

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AM Transmitters and Receivers

Broadcast transmitters can be classified according to carrier frequency. Long wave transmitters below 300 kHz can be used for regional

If the channel is affected by White Noise then it is called as AWGN channel. White Noise is basically thermal

The basic goal of communication system is to transmit information from one point to another. Information theory deal with efficient

In analog communication, the user objective is to achieve high fidelity in waveform reproduction. Hence, the suitable performance criterion is

As we have studied earlier about the base band pulse transmission, we have seen that the output of a PCM

Multiplexing is the sending of a number of separate signals together over the same cable or bearer, simultaneously without interference.

The modulation technique in which transmitted signal is in the form of digital pulses is called digital modulation system. Normally,

There is another method of modulating a sinusoidal carrier wave, namely, angle modulation in which either the phase or frequency

In this section we will discuss the devices and methods used for the generation of standard AM wave based on

In analog communication, message is analog and the carrier is sine wave, which is also analog in nature. The modulation

Noise may be defined, in electrical terms, as any unwanted introduction of energy tending to interfere with the proper reception

It often happens that the probability of one event is influenced by the outcome another event. As an example, consider

If the ultimate receiver knew in advance the message output from the originating source, there would be no need to

The rapidly changing face of technology necessitates learning of new technology. Today the question is no longer in the field