8th Semester Electronic and Communication Engineering (2012June) Question Papers

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8th Semester Electronic and Communication Engineering (2012June) Question Papers

  1. 1. USN 06EC81 Eighth Semester B.E. Degree Examination, Jlurae 2012 Wireless Gommunication Time: 3 hrs. Max. Marks: 100 Notez Answer FIVE full questions, selecting at least TWO questions from each part. PART -A 1a. Compare I G, 2G and 3G cellular systems. (06 Marks) E b. Explain the different steps involved in AMPS mobile-originated call. (10 Marks) c. What are the basic characteristics of 4G cellular systems? (04 Marks) 2a. Describe the home location register (HLP) implementation and its operation. (06 Marks)s-c, b. With a neat sketch, explain the hardware view of a cellular network. (08 Marks) c. Explain mobile station ISDN (MSISDN) Identification Number. Give an example. (06 Marks)-^ 3a. Explain the capacity expansion techniques: cell splitting and cell sectoring. (08 Marks) b. What is mobility management? Explain location management of a mobile station. (08 Marks) c. For a pafticular radio transmission technology, a minimum S/I ratio of l5 dB is needed for proper operation. What is.the minimum required cluster size if the path loss exponent is ct = 4? Assume that there are six co-channel cells in the first tier and all of them are at the same distance flom the mobile. (04 Marks) 4 a. With GSM network architecture. a neat sketch, explain (10 Marks)bE b. Describe the GSM TDMA time slot. (04 Marks)E-< c. Contrast the GSM hyper flame, super frame, multi frame and TDMA frame. (06 Marks) PART - B 5 a. With a neai sketch, explain the detailed steps required for radio resource connection,E^ establishment in GSM cellular svstems. (10 Marks) b. What is the basic difference between intra-BSC handover and inter-BSC handover?aE c. Why is a modified version of LAPD necessary fbr the Um interface? ,,.(Jj 6a. Explain the network nodes found in a Cdma 2000 wireless system: jr b. Describe the CDMA mobile operation known as access channel c. Explain the following briefly in case of CDMA systems: i) Soft handoff ii) Softer handoff iii) Soft softer handoff iv) Hard handoff 7 a. Explain the error detection and correction codes used for wireless telecommunications.:,. (08 Marks) b. Describe an OFDM modulation system. (08 Marks) c_ What is the received power in dBm for a signal in fiee space with a transmitting power ofz l0 Watts, frequency of 1900 MHz and distance from the receiver of 2 km if the transmitting antenna and receiving antenna have the same gain of approximately 1.6? What is the path loss in dB? (04 Marks) 8 a. What are the basic goals ofthe IEEE 802.1I wireless LAN standards? (06 Marks) b. Explain the components of the B luetooth architecture. (08 Marks) c. How is system capacity typically increased for a wireless MAN? (06 Marks)
  2. 2. l,V USN 06EC82 Eighth Semester B.E. Degree Examination, June 2012 Embedded System Design Time: 3 hrs. Max. Marks: 100 Note: Answer FIVE full questions, selecting at least TWO questions from each part. PART-A I a. What is an embedded system? Why is it so hard to define? (04 Marks) E b. Define time-to-market and NRE cost matrics? The life time of a product is 58 weeks. If the product is delayed by 5 weeks, determine the percentage revenue loss? Determine the per product cost if NRE cost is Rs.500000.00 and unit cost is Rs.8000.00 and company produces 6000 units of that product. (08 Marks) c. Explain how the top-down design process improves the productivity. (08 Marks) o- ,, 2 a. Explain the purpose ofcontroller and datapath in a single purpose processor. (04 Marks) b. Write a simple algorithm to find GCD of two integer numbers. Write FSMD for this algorithm and explain how it can be optimized. Also write its optimized FSMD. (08 Marks) c> ?J. c. Explain in brief, standard sofiware development process used in embedded system. (08 Marks) 3 a. What is watch-dog timer? What is its use? A l6-bit timer operates at a clock frequency of 20 .9.6 MHz. Determine the resolution and range of this timer. If a + 4 prescalar is also used, what is the range and resolution of this design? (06 Marks) b. Highlight the advantages of using data in digital form over its analog form. Explain the working of successive approximation type of analog to digital converter, with an example. (10 Marks) ;a c. Explain the features of flash memory and DRAM. (04 Marks) dE 4 a. Explain in brief, the memory hierarchy and cache operation. Given the following three cache designs, find the one with the best performance, by calculating the average cost of access. i) 4 kbytes, 8-way set associative cache with 670 miss rate. Cache hit costs I -cycle, -9. = cache miss costs l2-cycles. iD 8 kbytes, 4-way set associative cache with 4Vo miss rate. Cache hit costs 2-cycles, (-) < cache miss costs l2-cycles. ;.i iii) 16 kbytes, 2-way set associative cache with 2Vo miss rate. Cache hit costs 3-cycles, cache miss costs l2-cvcles. (10 Marks) z b. (04 Marks) c. (06 Marks) E
  3. 3. , { 068C82 PART - B5a. With an example, explain shared data problem. Also explain how an interrupt facility can solve this shared data problem. (10 Marks) b. Define interrupt latency. Mention the factors that affects interrupt latency. (04 Marks) c. Explain in brief, Function-Queue-Scheduling architecture. (06 Marks)6a. Briefly compare the methods for intertask communication. (10 Marks) b. Explain in brief, thee different states of task in RTOS. (05 Marks) c. Briefly compare the three methods of protecting shared data. (05 Marks)7a. What are the two rules, that interrupt routines in most RTOS environment must follow, that do not apply to task codes? (05 Marks) b. Illustrate with suitable examples and explain what happens when each rule of question no.7a is violated. (15 Marks)8 a. With suitable example, explain encapsulating semaphores. (08 Marks) b. Briefly explain any six problems with semaphores. (07 Marks) c. Give the hard real-time scheduling considerations. (05 Marks) 2of2
  4. 4. 06EC844 USN Eighth Semester B.E. Degree Examination, June 2Ol2 GSM Time: 3 hrs. Max. Marks:100 Note:, Answer FIVE full questions, selecting at least TWO questions from each part. PART -A -9 and I a. With relevant figures explain GSM PLMN structure. Explain its general objectives (08 Marks) services. b. Write a short note on MS subsystem. (06 Marks) c. With a neat diagram, explain the mapping of GSM layers on to OSI layers (06 Marks)o-" 2 a. List the.radio link measurements used in GSM. Discuss the current techniques used in GSM tr (12 Marks) to reduce interference. b. write a short note on channel borrowing. (08 Marks) 3 a. Explain the logical channel structure of GSM, discussing the functionalities of each_._ (10 - _ ^ Marks)ile b. With a flow diagram, explain mobile identification process. (06 Marks) (04 Marks) c. Give the structures of various bursts used in GSM. 4a. What are the attributes of a speech codec? Explain. (10 Marks) b. What are vocoders? Explain the working ofa full-rate vocoder with releuun fi9u",r. *".ur) PART - B 6d 5a. Discuss the message flow between MS and BSS, listing the primitives and types of ;a messages. (10 Marks) (10 Marks) b. What is handover? Explain intra MSC handover, using a flow diagram. :9.e. a ;i 6! 6a. What are wireless security requirements? (08 Marks) (06 Marks) b. Explain the file structure of a SIM card. (06 Marks) c. What is token based challenge? 7a. Discuss teletraffic models. (10 Marks) (10 Marks) b. Explain planning of a wireless network.z E a. What are the management requfements of a wireless network? (08 Marks) b. What are the five TMN layers? Explain the pertinent three layers briefly. (12 Marks)
  5. 5. / USN 06EC834 Eighth Semester B.E. Degree Examination, Jtne 2Ol2 Biomedical Signal Processing Time: 3 hrs. Max. Marks: 1 00 *""o";;:;f ilou{:!!i:rJi::*::!:;fr:" PART -A I a. Discuss the difficulties encountered during biomedical signal acquisition and analysis. (08 Marks) E b. With the help of a block diagram, explain the objectives of biomedical signal analysis. (06 Marks) I &.c c. Explain the following biomedical signals, draw the waveforms and give the frequency ranges relevant to these signals: i) ECG. iD EEG, (06 Marks) ; -EA 9i 2 a. Starting from mesh equations of potential differences between the links RA, LA & LL derive the expressions for aVt, aVl and aVp. Also represent relationships between these standard and augmented lead voltages using vector diagram. (08 Marks) b. Explain the different bandwidths that are used in ECG. Describe the principal applications for each of these bandwidths. (06 Marks) c. What are the two types of electrodes used in ECG? Which of them is popular? Why? (06 Marks) 963 a. .Compare analog and digital filters. What are the types of digital filters?-, . .- (08 Marks) 3i i- b. The z-transform of a filter is given by l-7- H"t= I - 1.06052-r + 0.56252-z c:i: " I 69 ;= What is its i) amplitude response ii) Phase response? Marks) 4 a. With a block diagram and relevant expressions, explain tn norse canceller model. (10 Marks) b. What are the main advantages of adaptive filters over fixed filters? Explain how a sine wave model is used for 60 Hz adaptive cancellation. (10 Marks) PART _ B z 5 a. Mention the characteristics of noise and signal in signal averaging techniques. Explain a typical signal averager with the help ofblock diagram. (10 Marks) a b. Show that signal averaging improves the SNR by a factor of{m, where m is the number of sweeps considered. What are the limitations of signal averaging? (10 Marks) I of 2
  6. 6. 06EC834 a. Explain the tuming point algorithm and fanalgorithm, each with an example. (10 Marks) b. For the given data set { l, l, l, l, t, t, t, 2, 2, 2, 2, 2, 2, 3,3, 3, 3, 3, 4, 4, 4, 4,s,s,s, 6, 6, 7 | Derive the codewords for the data using Huffman coding. What is the codeword length (average codeword length). Also depict the merging operation in a binary tree. (10 Marks)7 a. Explain a real time algorithm for QRS detection. Explain how heart rate is measured using R-R interval using the same algorithm. (10 Marks) b. With the help of a diagram of an ECG signal with tokens and of state transition diagram, explain automata based template matching of QRS detection. (10 Marks) a. Explain the portable arrhythmia monitor, with a block diagram. (10 Marks) b. Write shoft note on ST segment analysis. (06 Marks) c. Describe the differences between a general purpose microprocessor & DSPs. (04 Marks) 2of2

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