Carrier modulation by digital signals, Electrical Engineering

Assignment Help:

Q. Carrier Modulation by Digital Signals?

Digitally modulated signals with low-pass spectral characteristics can be transmitted directly through baseband channels (having low-pass frequency-response characteristics) without the need for frequency translation of the signal. However, there are many communication bandpass channels (telephone, radio, and satellite channels) that pass signals within a band of frequencies (that is far removed from dc). Digital information may be transmitted through such channels by using a sinusoidal carrier that ismodulated by the information sequence in either amplitude, phase, or frequency, or some other combination of amplitude and phase. The effect of impressing the information signal on one ormore of the sinusoidal parameters is to shift the frequency content of the transmitted signal to the appropriate frequency band that is passed by the channel. Thus, the signal is transmitted by carrier modulation. There are several carrier-modulation methods. However, we shall limit our discussion to the following, assuming only binary modulation in all cases:

• Amplitude-shift keying (ASK)

• Phase-shift keying (PSK)

• Differential phase-shift keying (DPSK)

• Frequency-shift keying (FSK).


Related Discussions:- Carrier modulation by digital signals

Mobile and wirelss communicatio, In a CDMA system, the signal is spr...

In a CDMA system, the signal is spread over a large bandwidth by multiplying the transmitted symbol by a sequence of short pulses, also called chips. The

Power flow analysis, Ask question #Minimum 10] In the system shown in Fig...

Ask question #Minimum 10] In the system shown in Figure 4-1, the rated voltage of the line is 110kv, and the conductors are all LGJ-120 type. The parameters are: r1=0.21O/km,x1=0

Working principle of an electronic voltmeter, Q.   Explain the working prin...

Q.   Explain the working principle of an electronic voltmeter. Sol. Electronic voltmeter Basic Voltmeter: The addition of a series resistor, or multiplier, converts the

Microcontroller, What are usue and all the details of 8051 microcontroller ...

What are usue and all the details of 8051 microcontroller with its block diagram pin diagram and all other details

Line Protection., The Lennox to Bowmanville 500 kV circuit, spanning a dist...

The Lennox to Bowmanville 500 kV circuit, spanning a distance of about 180 km, has series (inductive) impedance j 0.0224 pu and shunt (capacitive) admittance j 2.34 pu, quoted on b

Illustrate flat plate collectors, What is the use of basic earth-sun angles...

What is the use of basic earth-sun angles? Show by mean of diagram. Illustrate sun as source of energy with relevant data? Illustrate flat plate collectors. Describe liquid f

What are the different types of patrolling, Q. What are the different types...

Q. What are the different types of Patrolling? When these are adopted? What are points to be considered while preparing the charts? Ans.- Types of Patrolling. 1. Keyman's

Determine the force applied to the plunger by system, Q. For the electromag...

Q. For the electromagnet shown in Figure, the λ-i relationship for the normalworking range is given by i = aλ 2 + bλ(x -d) 2 ,where a and b are constants. Determine the force app

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd