exam time table guys check it out!!!!!!!!!!!!!

http://www.annauniv.edu/ttug2011/timendeightregfivesem.pdf

question bank for digital communication

UNIT-1 : DIGITAL COMMUNICATION SYSTEM
Part A ( 2 Marks)
1. Give the mathematical form of sampling process
2. List out uses of sampling theorem
3. Define instantaneous sampling
4. What is anti alising effect
5. What is PWM
6. List out the types of Quantization
7. Define bandwidth.
8. Transfer 01101001 in to Manchester code
9. What is noise consideration in PCM
10. Define processing gain.

Part B
1. Drive the expression for the sampling process in time domain. (16)
2. What are all the types of sampling technique and explain about any two. (16)
3. a. Explain the generation of PPM and PWM with neat circuit diagram. (8)
b. Explain the quantization process with PCM block diagram. (8)
4. Write brief notes on 1) TDM(8 )
2) FDM (8)
5. Compare DM with ADM and explain linear prediction filter. (16)

UNIT -2 : BASEBAND FORMATTING TECHNIQUES
Part A ( 2 Marks)
1. Define matched filter
2. What is decision device
3. Draw the block diagram of base band binary data transmission system
4. What is Nyquist channel
5. Draw the frequency and time response of raised cosine spectrum
6. What you mean by correlative level coding
7. Define LMSA
8. What is DFE
9. List out the use of eye patterns
10.Define zero crossing effect

Part B
1. Derive the expression for the matched filter and prove any one property. (16)
2. Prove the effect ISI using necessary block diagram and design. (16)
3. Write brief notes on Nyquist’s criterion for distortion less base band binary transmission. (16)
4. Explain the six array PAL transmission. (16)
5. Why do we adoptive equalizer and design any one type of adoptive equalizer. 

UNIT – 3: BASEBAND CODING TECHNIQUES
Part - A ( 2 Marks)
1. Define FSK
2. Draw the Basic block diagram of FSK
3. Define MFSK
4. Draw the wave form of the MPSK
5. What is MSK
6. Define Non-coherent FSK
7. Differentiate coherent FSK from Non-coherent FSK
8. What do you mean by Probability error.
9. Define Passband transmission.
10 Draw the baseband signal.

Part B
1. Derive the expression for the BPSK technique. (16)
2. Explain the MFSK and derive the pe. (16)
3. Draw the space diagram of MSK and explain about the same. (16)
4. Derive the error probability expression for the MPSK. (16)
5. Compare the all types of Passband transmission. (16)


Unit- 4: BASEBAND RECEPTION TECHNIQUES
Part A ( 2 Marks)
1. Define the Channel coding
2. List out the uses of the Channel Coding
3. Differentiate Sourced coding from the Channel coding.
4. Prove any two properties of Block Codes.
5. What is syndrome?
6. Define Code rate.
7. What is BSC?
8. Draw the channel diagram of the BPSK system
9. What is turbo codes
10. Define CRC.


Part B
1. Explain the channel coding technique used in the Block codes. (16)
2. What are all the message vectors can be extracted from the
code vector that was generated by 1+X+X3. (16)
3. Explain the Viterbi algorithm for the detection of any two
message vectors (One Word) from the code vectors that
were generated by (111), (101) and (011). (16)
4. Explain the construction of Block Code and
Explain how error syndrome is calculated. (16)
5. Explain in detail about Orthogonal codes, Biorthogonal codes and
Transorthogonal codes. (16)


UNIT- 5: BANDPASS SIGNAL TRANSMISSION AND RECEPTION
Part A ( 2 Marks)
1) What are all the types of SSM
2) What is the use of PN sequence
3) List out the prosperities of PN sequence
4) What is the processing gain of SSM.
5) Define jamming margin
6) Define FHSSM
7) Define SFHSS.
8) Define FFHSM.
9) Draw the PN sequence generator for [6,4,2,1]
10) What you mean by runs in PN sequence
11) State the Gold Theorem.

Part B
1. Generate the PN sequence for [5, 4, 3, 1] and prove the all properties of the same. (16)
2. List out and prove the Properties of the PN sequence. (16)
3. Explain the concept of DS/BPSK. (16)
4. List out the uses of the FH. Explain the FH techniques with the frequency spectrum. (16)
5. Write shorts notes on
1. Probability Error. (4)
2. Jamming Margin (4)
3. (S/N) of the DS System. (8

two marks question dsp follow this link...........

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histroy of electronics and communication engineering

Electricity has been a subject of scientific interest since at least the early 17th century. The first electrical engineer was probably William Gilbert who designed theversorium: a device that detected the presence of statically charged objects. He was also the first to draw a clear distinction between magnetism and static electricity and is credited with establishing the term electricity.^[2] In 1775 Alessandro Volta's scientific experimentations devised the electrophorus, a device that produced a static electric charge, and by 1800 Volta developed the voltaic pile, a forerunner of the electric battery.^[3]

However, it was not until the 19th century that research into the subject started to intensify. Notable developments in this century include the work of Georg Ohm, who in 1827 quantified the relationship between the electric current and potential difference in a conductor, Michael Faraday, the discoverer of electromagnetic induction in 1831, and James Clerk Maxwell, who in 1873 published a unified theory of electricity and magnetism in his treatise Electricity and Magnetism.^[4]

Thomas Edison built the world's first large-scale electrical supply network.

During these years, the study of electricity was largely considered to be a subfield of physics. It was not until the late 19th century that universities started to offer degrees in electrical engineering. The Darmstadt University of Technology founded the first chair and the first faculty of electrical engineering worldwide in 1882. In the same year, under Professor Charles Cross, the Massachusetts Institute of Technology began offering the first option of Electrical Engineering within a physics department.^[5] In 1883 Darmstadt University of Technology and Cornell University introduced the world's first courses of study in electrical engineering, and in 1885 theUniversity College London founded the first chair of electrical engineering in the United Kingdom.^[6] The University of Missourisubsequently established the first department of electrical engineering in the United States in 1886.^[7]

Nikola Tesla made long-distance electrical transmission networks possible.

During this period, the work concerning electrical engineering increased dramatically. In 1882, Edison switched on the world's first large-scale electrical supply network that provided 110 volts direct current to fifty-nine customers in lower Manhattan. In 1884 Sir Charles Parsons invented the steam turbine which today generates about 80 percent of the electric power in the world using a variety of heat sources. In 1887, Nikola Tesla filed a number of patents related to a competing form of power distribution known asalternating current. In the following years a bitter rivalry between Tesla and Edison, known as the "War of Currents", took place over the preferred method of distribution. AC eventually replaced DC for generation and power distribution, enormously extending the range and improving the safety and efficiency of power distribution.

The efforts of the two did much to further electrical engineering—Tesla's work on induction motors and polyphase systemsinfluenced the field for years to come, while Edison's work on telegraphy and his development of the stock ticker proved lucrative for his company, which ultimately became General Electric. However, by the end of the 19th century, other key figures in the progress of electrical engineering were beginning to emerge.^[8]

[edit]Modern developments

During the development of radio, many scientists and inventors contributed to radio technology and electronics. In his classic UHF experiments of 1888, Heinrich Hertztransmitted (via a spark-gap transmitter) and detected radio waves using electrical equipment. In 1895, Nikola Tesla was able to detect signals from the transmissions of his New York lab at West Point (a distance of 80.4 km / 49.95 miles).^[9] In 1897, Karl Ferdinand Braun introduced the cathode ray tube as part of an oscilloscope, a crucial enabling technology for electronic television.^[10] John Fleming invented the first radio tube, the diode, in 1904. Two years later, Robert von Lieben and Lee De Forest independently developed the amplifier tube, called the triode.^[11] In 1895, Guglielmo Marconi furthered the art of hertzian wireless methods. Early on, he sent wireless signals over a distance of one and a half miles. In December 1901, he sent wireless waves that were not affected by the curvature of the Earth. Marconi later transmitted the wireless signals across the Atlantic between Poldhu, Cornwall, and St. John's, Newfoundland, a distance of 2,100 miles (3,400 km).^[12] In 1920 Albert Hull developed the magnetron which would eventually lead to the development of the microwave oven in 1946 by Percy Spencer.^[13][14] In 1934 the British military began to make strides toward radar (which also uses the magnetron) under the direction of Dr Wimperis, culminating in the operation of the first radar station at Bawdsey in August 1936.^[15]

In 1941 Konrad Zuse presented the Z3, the world's first fully functional and programmable computer.^[16] In 1946 the ENIAC (Electronic Numerical Integrator and Computer) of John Presper Eckert andJohn Mauchly followed, beginning the computing era. The arithmetic performance of these machines allowed engineers to develop completely new technologies and achieve new objectives, including theApollo missions and the NASA moon landing.^[17]

The invention of the transistor in 1947 by William B. Shockley, John Bardeen and Walter Brattain opened the door for more compact devices and led to the development of the integrated circuit in 1958 by Jack Kilby and independently in 1959 by Robert Noyce.^[18] Starting in 1968, Ted Hoff and a team at Intel invented the first commercial microprocessor, which presaged the personal computer. TheIntel 4004 was a 4-bit processor released in 1971, but in 1973 the Intel 8080, an 8-bit processor, made the first personal computer, the Altair 8800, possible.^[19]

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