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EC2311 Communication Engineering - Important Questions - Oct 2012 V+ Edition

Anna University

Department of Electronics and Communication Engineering

All Units Part B (16marks) Questions V+ Edition (Oct 2012)


Semester : V

Department : B.E EEE

Content : Part B Important Questions

Attachment : (Paper Save Edition - All Units Important Questions in a Single Page)

.pdf   2311 M0DEL IMP.pdf (Size: 19.84 KB / Downloads: 782)

1. A commercial AM station is broadcasting with an average transmitted power of 10kW.The modulation Index is set at 0.707 for message signal .Find the transmission power, efficiency and average power in carrier component of transmitted signal. (8)
2. Explain Transmission bandwidth and VSB with block diagram. (8)
3. A telephone transmitter using AM has unmodulated carrier output power of 20 kW and can be modulated to a maximum depth of 80% by a sinusoidal modulating voltage without causing overloading.Find the value to which unmodulated carrier power may be increased without resulting in overloading if the maximum permitted modulation index is restricted to 60%. (8)
4.Explain indirect method of generation of FM. (16)
5.With the help of neat block diagram explain functioning of heterodyne radio receiver. list out the significance of it over TRF receivers.(16)

1. What is companding? Explain how companding improves the SNR of the system.(8)
2. Calculate the minimum required bandwidth for a non coherently detected orthogonal binary FSK system. The higher frequency signalling rate is 1 Mhz/sec and the symbol duration is 1 ms.(8)
3. Derive an expression for average output noise power in delta modulation.(8)
4. Explain transmission and reception schemes of QAM.(16)
5. Explain uniform and non-uniform quantization in PCM. (16)


1. Explain the procedure of Shannon source coding theorem. (8)
2. Explain about BSC, BEC and BCC. (8)
3. Explain about the tradeoff between bandwidth and signal to noise ratio. (8)
4. Write the procedure for Huffman coding and its entropy. (8)
5. Explain the concept and design procedure of Viterbi decoding algorithm for a block code.(8)
6. Give the properties of cyclic codes and explain about syndrome coding.(8)

1. Discuss the various Multiple Access techniques used in wireless communication with merits and demerits. (16)
2. Explain in detail about the Spread spectrum systems. (16)
3. Discuss about SDMA technique and its applications in wired and wireless communication. (16)
4. Compare the performance of CDMA with FDMA and TDMA. (16)

1. Explain the characteristics of different types of optical fiber. (8)
2. Explain the losses associated with fiber cables. (8)
3. Describe about the multiple access techniques used in a satellite system. (16)
4. Explain briefly about INSAT and INTELSAT. (16)
5. Derive the satellite system link equation. (8)
6. List the advantages of using optical fiber as a medium of communication in telephone network. (8)

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