QUESTION BANK
15EC81-WIRELESS CELLULAR AND 4G LTE BROADBAND
MODULE-1
1. Briefly explain key enabling technologies in OFDM?
2. Briefly explain IP-Based flat network architecture?
3. Draw and explain LTE network architecture?
4. Explain difference between SC-FDE and SC-FDMA?
5. Derive broadband wireless channel and discrete time in TDL?
6. Derive path loss ? or Friss transmission formula?
7. Explain shadowing?
8. Briefly explain cellular concept?
9. Derive and explain analysis of cellular systems?
10. What is sectoring, with neat diagram?
11. Derive statical channel models
Rayleigh fading
The Ricean Distribution
Nakagami-m fading
12. Explain (i) Frequency correlation
(ii) Time correlation
13. Draw and explain LTE channel models for multipath?
Module - 2
1.Briefly explain OFDM in LTE?
2.Explain timing synchronization with neat diagram?
3.Derive frequency synchronization with relative frequency offset?
4.With neat sketch, Explain PAR problem and Quantifying with IFFT equation?
5.Explain SC-FDE system description?
6.Explain multiple access for OFDM systems?
7.With neat sketch ,explain OFDMA how it works?
8. With neat sketch ,explain SC-FDMA how it works?
9. Explain OFDMA and SC-FDMA in LTE?
10.Explain spatial diversity with array gain and diversity gain?
11.Explain with neat diagram receive diversity in selection combing?
12.Explain transmit diversity?
13.Brieffly explain spatial multiplexing with open loop MIMO?
14.Explain interference suppression and spatial multiplexing?
Module 3
1.Write the design principles of LTE?
2.With neat sketch end-to-end network architecture in LTE?
3.Explain hierarchical channel structure of LTE?
4.Explain logical channels?
5.Explain downlink OFDMA radio resources?
6. Explain uplink SC-FDMA radio resources?
7.Draw and explain channel coding processing?
8.with neat diagram explain downlink shared channel?
9.what is multiantenna transmission?
10.Explain downlink control channel encoding and modulation in DCI?
11.Explain broadcast channels?
12.Explain multicast channels?
13.Explain downlink physical signals?
14.With neat sketch H-ARQ in the downlink?
MODULE-4
1. Draw and explain uplink channel coding processing?
2. with neat diagram explain uplink shared channel?
3. Briefly explain about uplink control information with channel coding UCI and PUCCH?
4. With neat sketch mapping of physical resource blocks for PUCCH?
5. Explain uplink reference signal sequence and mapping of demodulation reference signals?
6. Explain random access channels?
7. Briefly explain H-ARQ in uplink?
8. Explain H-ARQ feedback for downlink transmission?
9. Explain H-ARQ indicator for uplink transmission?
10. Explain channel quality indicator feedback and CQI estimation?
11. Derive precoder estimation for multicarrier systems?
12. Explain buffer status reporting in uplink?
13. Explain scheduling and resource allocation?
14. Explain cell search with neat diagram?
15. With neat diagram explain random access procedures?
MODULE -5
1. Draw and explain PDCP overview?
2. Briefly explain MAC/RLC overview?
3. What is the purpose of MAC and RLC layers?
4. Explain RRC functions?
5. Explain RRC states with neat diagram?
6. What is mobility management?
7. With neat sketch explain (i) s1 mobility (ii) x2 mobility
8. Explain intercell interference coordination techniques upload and download link power
levels?
