537 questions and answers
State Channel capacity theorem
Bandwidth and noise power place a restriction upon the rate of information that can be transmitted by a channel.
What is meant by entropy of a source?
In a practical communication system, we usually transmit long sequence of symbols from an information source. Thus we are more interested in the average information that a source produces than the information contain of a single symbol.
Apply Shannon – Fano algorithm to the source with M = 8 emitting message A, B, C, D, E, F, G, H having probability P(A) = 1/2, P(B) = P(C) = 1/8, P(D) = P(E) = P(F) = 1/16, P(G) = P(H) = 1/32, calculate entropy, average code length and efficiency of coding.
Given that the probabilities of the eight messages are respectively P(A) = 1/2, P(B) = P(C) = 1/8, P(D) = P(E) = P(F) = 1/16, P(G) = P(H) = 1/32
Write short notes on:
The block diagram of voltage control oscillator is given in . 9. In most the cases, the frequency of an oscillation is determined by the time constant RC. However, in cases or applications such as FM., tone generation, and frequency shifting keying (FSK), the frequency is to be controlled by means of an input voltage, called the control voltage.
Write short notes on:
A typical circuit diagram of Ring modulator is given in Figure 10(a). The ring modulator consists of two centre trap transformers T1, T2 and four non-linear devices i.e. p-n junction diodes D1, D2, D3 and D4. Carrier signal c(t) with frequency fc is applied at the center tapes of two transformers.
Write short note on PCM ( Pulse Code Modulation).
Figure shows the basic block diagram of pulse code modulation scheme. The main elements of the PCM systems is \nTransmitter Transmission path (Channel) Receiver
Write a short note on TDM (Time Division Multiplexing).
The Time Division Multiplexing (TDM) is a multiplexing method by which multiple number of channel containinformation passes over a common transmission media or channel at different time slots. In other way TDM is a technique in which combining the digital message signal from different sources on a single data stream and transmit over a common channel at different time slot.
What are the basic components of communication system? Which of the above components affect the signal most with noise, in a communication system?
The basic compos of communication systems are Transmitter Transmission path
Describe why modulation is necessary for communication.
Multiplexing: Multiplexing is the technique use for transmitting several information bearing signaler the same physical channel simultaneously. It is possible; if different type of base band signal is modulate by the different high ranges carrier frequency.
Write short note on Microwave Power Measurement
Microwave power measurement devices can be divided into two categories: devices such as detector , bolometer and tocouples, whose resistance changes with the applied power and calorimeters in which the temperature rise of a known quantity of liquid being used as a load measured.
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