QUESTION BANKNAME:ROLL NO: Course DetailsDATE UNIT – I – SATELLITE COMMUNICATION UNIT – II – MULTIPLE ACCESS AND SWITCHING TECHNIQUES UNIT – III – THE CELLULAR CONCEPT UNIT – IV – WIRELESS COMMUNICATION SYSTEM UNIT –V – SPREAD SPECTRUM SIGNALS FOR DIGITAL COMMUNICATIONCourse Code & Title : L 802 / ADVANCED COMMUNICATION SYSTEMSYEAR : 2013Dept/ Semester : ECE / Semester 8 AJAL JOSE : Faculty-In-Charge
S8 – ECE [ ADVANCED COMMUNICATION SYSTEMS ] L802 3+1+0 Module1Satellite Communication - Satellite orbits – Geo synchronous orbit –orbital velocity – Roundtrip time delay - Antenna look angles - Satellite classifications - spacing - frequency allocation-System parameters analysis - link equations- Link Budget - Spacecraft subsystem (blockschematic). Tracking and tele command - Earth stations – Antenna systems – receiversubsystems (block) – functioning LNA – LNB - down converter - channel filters -demodulators-INTELSAT/INMARSAT –Overview of INSAT.Module 2Types of satellite communication system-FSS, DSS-Direct broadcasting and communitybroadcast - Multiple Access Techniques– Introduction- FDM-FMFDMA, PSK-TDMA, SSMA,CDMA - Switching techniques – circuit – message - packet switching- Packet satellite network-domestic satellite system.Module 3The cellular concept – Introduction - Frequency reuse –channel assignment – Hand offstrategies – prioritizing handoff –practical handoff – Co-channel interface and system capacity –channel planning – adjacent channel interference –Cell splitting – sectoring – repeaters – micro-cell concept- Blue tooth technology- Fundamentals and Applications.Module 4Wireless communication system-paging-cordless & cellular system –comparison- Secondgeneration cellular networks-third generation cellular networks – Global System for Mobile –services and features – Architecture – Radio subsystem – channel types – frame structure -Global positioning Systems - basic concept system block - positioning – Applications.Module 5Spread spectrum Techniques and remote sensing- Pseudo noise sequences –time hopping-frequency Hopping – Robustness – Fast and Slow hopping – Hybrid & Chirp spread spectrum-Synchronization – acquisition – Tracking - Concepts of Jamming -Analysis of DS/SS –Analysis of avoidance-generation of signals detection –Applications.References1. Electronic communication system fundamentals: Wayne Tomasi, Pearson Education.2. Wireless communication principles and practice: T S Rappaport, Pearson Education.3. Satellite communication: Gagliardi.4. Digital Communication Fundamentals and Applications: B Sklar, Pearson Education.5. Digital communication: Simon Haykin, John Wiley&Sons.6. Space communication System: Filipowasky, McGrawHill.
UNIT – I – SATELLITE COMMUNICATION Part – A1. List out the advantages of satellite communication systems ?2. Spell out the types of satellite classifications ?3. What is round trip time delay? Sate its importance in communication system ?4. Compare LNA with LNB ?5. Name the types of antenna look angles in satellite communication ?6. What are geo synchronous orbits? Give examples?7. Differentiate down converters and demodulators ?8. Define tele-command . List out its advantages ?9. Write down the link equation ?10. List out the factors that influences the choice of satellite antenna systems ? Part-B11. Explain in detail the satellite receiver subsystem with relevant diagrams ?12. Analyze link equations and link budget ?13. Explain in detail the satellite system parameters with examples ?14. Explain (i) INTELSAT (ii) INMARSAT ?15. Explain the overview of INSAT ?
UNIT – II – MULTIPLE ACCESS AND SWITCHING TECHNIQUES Part – A1. Differentiate FSS and DSS?2. Why Satellites remain in Orbit ?3. List out the types of satellite communication systems ?4. What are the advantages of FDM?5. What is message switching ? Give advantages ?6. Compare optical Fiber vs Satellite commucation techniques ?7. Define processing gain in CDMA ?8. State the significance of rake receivers ?9. Discuss Reasons for Widespread Use of Multiplexing ?10. Explain maximum ratio combining ? Part – B11. Explain the theory of Multiple access Techniques of digital communication systems. Alsodiscuss various Multiple access Techniques ?12. Explain i) Packet satellite network ii) Domestic satellite system ?13. Explain i) FM FDMA ii) PSK ?14. Explain i) SSMA ii) TDMA ?15. Explain the process of CDMA systems ?16. Explain i) Direct broadcast ii) Community broadcast ?17. Explain i) circuit switching ii) packet switching ?
UNIT – III – THE CELLULAR CONCEPT Part – A1. State the significance of footprint ?2. Compare 3 cell reuse pattern and 7 cell reuse pattern ?3. State the concept of breathing cell ?4. Define frequency reuse ?5. List out the advantages of hexagonal cells over circular cell structure ?6. Spell out the concept behind cell dragging ?7. Define dwell time ?8. Discuss the need of repeaters ?9. What are the advantages of cell sectoring ?10. Define mobile assisted handoff (MAHO) ?11.write short notes on near – far effect ? Part – B11. Explain in detail the system generated cellular interference i) co channel interference ii) adjacent channel interference ?12. State the requirement “ channel planning for wireless systems ?13. Explain prioritizing handoff methods : i) guard channel method ii) queuing of handoff request ?14. Explain Umbrella cell approach ?15. Write notes on i) Hard handoff ii) Soft handoff ?16. If the number of channels are insufficient , how the capacity can be improved ? Or Explain a) cell splitting b) cell sectoring c) micro cell method
UNIT – IV – WIRELESS COMMUNICATION SYSTEM Part – A1. State the advantages of cordeless communication ?2. Differentiate paging and cordeless communication ?3. List out the advantages of cellular system ?4. Spell out the services of GSM ?5. Define EIR ?6. Write down the need of AuC ?7. What is 2.5G – GPRS ?8. What is 2.75G – EDGE ?9. What is CDPD service ?10. Differentiate HLR and VLR ? Part – B11. With diagram explain GSM channel types ?12. Explain in detail 3G cellular networks ?13. Explain GSM Architecture ?14. Write detailed notes on GPS with relevant diagrams ?15. Discuss in detail the frame structure of GSM systems ?
UNIT –V – SPREAD SPECTRUM SIGNALS FOR DIGITAL COMMUNICATION Part – A1. Draw the block diagram of spread spectrum communication2. List out the types of spread spectrum communication3. What is direct sequence spread spectrum?4. Spell out the merits and demerits of spread spectrum5. What is chirp spread spectrum?6. State the advantages of frequency hopping spread spectrum over direct sequence spreadspectrum7. What is PN sequence?8. List out the properties of PN sequence9. What is AWGN channel?10. What is synchronization of spread spectrum?11. Explain jamming ?12. Discuss the concept of tracking?13. Differentiate fast and slow hopping ? Part – B11. Explain in detail the method of direct sequence spread spectrum signals. Also obtain theequation for error rate performance.12. Explain in detail the method of frequency hopping spread spectrum signals. Also obtain theequation for error rate performance.13. Explain with relevant diagram the model of spread spectrum digital communicationsystems. Also discuss its advantages over other modulation systems14. Explain (i) PN sequences generation ii) Synchronization of spread spectrum systems15. Explain (i) Error rate performance of the coder in DS-SS (ii) Error rate performance of thecoder in FH-SS
MISCELLANEOUS QUESTIONSUnit 1 1. Explain about processing satellites ? 2. Detail on satellite orbits ? 3. short note on transponders ?Unit 2 1. Explain about processing satellites ?Unit 3 1. Explain the concept of trunking and grade of service ? 2. Write short notes on near –far effect ?Unit 4 1. Write short notes on Geometric Dilution of Precision (GDOP) ? 2. Compare Ephemeris data and Almanac data in GPS system ? 3. Sources of Unintentional Timing Errors in GPS system ? 4. Explain Differential GPS ? 5. Four Basic Functions of GPS ? 6. “ GPS uses concept of time of arrival (TOA) ” explain ?Unit 5 1. Write short notes on hybrid spread spectrum? 2. Explain the concepts of remote sensing?