QUESTION BANK

QUESTION BANK

2017

SIDDHARTH GROUP OF INSTITUTIONS :: PUTTUR

Siddharth Nagar, Narayanavanam Road 517583

QUESTION BANK (DESCRIPTIVE)

Subject with Code : 3G/4G Course & Branch: B.Tech - ECE Year & Sem: IV-B.Tech & II-Sem Regulation: R13

UNIT-1

I. 10 Mark Questions

1. Explain briefly about the standards of 3G / 4G.

2. (a) With a neat diagram and equation, explain about wireless channel and fading.

(b) Write about Data rates of LTE.

3. (a) Write a short note on Rayleigh Fading Wireless channel.

(b) Write about Data rates of WCDMA / UMTS.

4. (a) Explain briefly about BER performance of Wireless System.

(b) Explain the data rates of 1xEVDO.

5. (a) With neat sketch, explain diversity in Wireless Communication.

(b) Explain the data rates of WIMAX

6. (a) Explain the concept of Multiple Receive Antenna System Model.

(b) Explain the data rates of GSM.

7. (a) Derive the expression for BER in Multi-Antenna Wireless System.

(b) Explain the data rates of EDGE.

8. (a )Write a short note on Diversity Order.

(b) Explain the data rates of GPRS.

9. (a) Write a short note on Spatial Diversity.

(b) Write a brief note about wireless communication environment.

10. (a) Explain BER for Wired Communication System.

(b) Write the expression for Maximal ratio combiner.

II. Two Mark Questions

1. What is meant by HLR and VLR?

2. Write a short note on diversity

3. At an SNR of 10dB, what is the BER of wired communication?

4. Explain the features of 2G system.

5. What is meant by Rayleigh fading?

6. What is meant by fading?

7. Write short note on 2G wireless systems

8. Write short note on 3G wireless systems

9. Write short note on 4G wireless systems

10. Write over view of cellular service progression

11. Explain brief note about HSDPA.

12. Explain brief note about HSUPA.

13. Explain brief note about WIMAX.

14. Explain brief note about LTE.

15. What is deep fade?

16. What is 1xEVDO?

17. What is WCDMA?

18. Write the applications of 4G technology.

19. Write the applications of 3G technology.

20. Write the applications of 2G technology.

UNIT-2

III. 10 Marks Questions

1. Explain about Frequency Reuse

2. Draw the block diagram of basic cellular systems and explain operation of cellular systems

3. What is handover and Explain about hand over scenarios?

4. Explain about Teletraffic Theory

5. Explain Multiple Access Technologies

6. Explain about Jakes model for wireless communication.

7. Explain delay spread in wireless communications

8. Write a brief introduction about Cellular process and call set-up.

9. Explain the Coherent bandwidth in wireless communication.

10. Explain about different types of Doppler effects on Doppler spectrum

IV. Two Marks Questions

1. What is hand over? Explain soft hand over?

2. What is hand over? Explain hard hand over?

3. Draw the Block Diagram of Basic Cellular systems

4. Define Call Setup

5. What is TDMA?

6. What is FDMA?

7. What is CDMA?

8. Define Co-channel interference.

9. Define coherence bandwidth for wireless communications.

10. What is delay spread?

11. What is hand off?

12. What is MTSO?

13. What are the components of base station?

14. What are the basic blocks of cellular communication?

15. What are the components of mobile station

16. What is the shape of the cell?

17. Why are hexagonal shape cells preferred in cellular communication?

18. What is Doppler fading in wireless systems?

19. Draw the schematic of wireless propagation environment.

20. What is LOS and NLOS?

UNIT-3

V. 10 Marks Questions

1. Explain briefly about the introduction to CDMA and basic CDMA mechanism.

2. (a) Write spreading codes based on Pseudo-Noise (PN) Sequence

(b) Write the properties of PN sequence

3. (a) Write a short note on Multicarrier transmission of OFDM .

(b) Write the short note on orthogonal spreading codes in CDMA.

4. Explain the IFFT / FFT implementation stages of OFDM with block diagram.

5. Explain the concept of Multipath diversity and Rake receiver

6. Explain about the Asynchronous CDMA and Synchronous CDMA.

7. Explain the properties of Pseudo Noise sequences.

8. Write a short note on OFDM PAPR.

9. What is OVSF? Explain the OVSF code generation process with variable tree diagram.

10. What is PN sequence? Explain how PN sequences are generated.

VI. Two Mark Questions

1. Write about PN sequence balance property.

2. What is multiple access technique?

3. List the advantages of CDMA

4. What is OVSF?

5. What is PN sequence?

6. What is maximum length sequence?

7. What is need of OFDM?

8. Draw the block diagram for multicarrier receiver?

9. What are the merits of cyclic prefix?

10. What are the techniques used to maintain PAPR of OFDM signals?

11. List the applications of CDMA.

12. What is CDMA?

13. What is OFDM?

14. What is PN sequence?

15. What is Run length property?

16. What is correlation property?

17. What is balance property?

18. What is multipath diversity?

19. What is Rake receiver?

20. Write the merits of Cyclic prefix.

UNIT-4

VII. 10 Marks Questions

1. Explain in detail about MIMO ZF (Zero Forcing) receiver.

2. List and explain the features of Ultra wide Band.

3. Write a brief introduction about MIMO wireless communications

4. What is a MSME receiver? Explain how it is used for the MIMO wireless communication System.

5. With neat sketch, explain MIMO-OFDM Transmitter and Receiver.

6. Define UWB and mention its features.

7. What are the single band UWB modulation schemes? Explain.

8. Give the analysis of BER performance in UWB detection.

9. Explain MIMO Diversity with a neat block diagram.

10. Write a brief note on V-BLAST architecture.

VIII. Two Marks Questions

1. Write a short note on MIMO

2. Draw the schematic diagram of MIMO system.

3. List and explain the features of Ultra wide Band.

4. Write a brief introduction about MIMO wireless communications

5. Give the expression for MIMO channel capacity based on SVD.

6. What are Eigenmodes?

7. List the characteristics of spatial multiplexing.

8. Draw the architecture of V-BLAST,

9. List the advantages of MIMO beam forming.

10. What is meant by Maximal ratio transmission?

11. List the advantages of MIMO-OFDM technique.

12. List any five features of UWB.

13. List the transmission models used for enabling Multiple access in single band UWB.

14. Explain the concept of spatial multiplexing in MIMO systems.

15. What are Eigen modes? Explain.

16. Define diversity.

17. Write a short note on Alamouti code.

18. Draw and explain Alamouti OSTBC.

19. Describe OSTBC with an example

20. Write the advantages of OFDM.

UNIT-5

IX. 10 Mark Questions

1. With neat sketches, explain GSM Architecture in detail

2. Explain the Architecture of GPRS

3. With neat sketch, explain the architecture of WIMAX

4. Explain GSM services and features

5. Draw the protocol stack for GPRS and discuss it.

6. Explain the architecture of WCDMA.

7. Write short note on LTE.

8. Explain in detail about WIMAX.

9. Distinguish between WIMAX and LTE standard.

10. What is GPRS technology? Explain

X. Two Marks Questions

1. Write two advantages of GSM

2. Explain about LTE.

3. Write about services of GSM.

4. What is meant by WIMAX?

5. What is meant by WCDMA?

6. Define GPRS.

7. What is the range of WIMAX?

8. What is the frequency range of WiMax?

9. Write the drawbacks of GSM

10. Write the differences between 3G and 4G

11. What is the purpose of GPRS in 3G?

12. Explain UMTS.

13. Explain the features of GSM.

14. What is meant by SIM?

15. Write a short note on MIMO

16. Define WCDMA

17. How fast is 4G compared to 3G?

18. Define GSM and state its features.

19. List any five features of LTE.

20. List the features of WIMAX.

SIDDHARTH GROUP OF INSTITUTIONS :: PUTTUR

Siddharth Nagar, Narayanavanam Road 517583

QUESTION BANK (OBJECTIVE)

Subject with Code : 3G/4G Course & Branch: B.Tech - ECE Year & Sem: IV-B.Tech & II-Sem Regulation: R13

UNIT-1

1.________________ is the average upload speed of 4G network

2.4G is ______ times faster than 3G`

3. __________________ is not characteristic of 4G?

4.Fading is caused due to______________________________

5.Doppler spread refers to ___________________________

6.Coherence time is _____________ proportional to ____________ Spread

7.In __________ Technology, frequency spectrum is divided into smaller spectra and is allocated

to each user.

8.In _______ Technology, Multiple Access is achieved by allocating different time slots for the

different users.

9.The basic GSM, the type of Traffic Channels are based on Connection ___________ and

____________Switching

10. An Antenna which attempts to direct all its energy in a particular direction is called as

____________ Antenna

11. An attenuation that occurs over many different wavelengths of the carrier is called

________________ fading

12. ____________ fading is the Narrow Band Fading channel model without LOS path

13. For Ethernet medium, we must provide a BER of _______ .

14. Transfer rates for wired communication is up to _________

15. Wired communication is suitable for distance up to________

16. Wired communication is _________, __________ & _________

17. Wireless communication is __________, ___________ & ___________

18. In wireless communication, data rate ___________ with distance

19. The important features of Wireless communication is _________, ________ & _________

20. WCDMA stands for ________________________________

21. The channel experience by each receive antenna is independent from the channel

experienced by ________________________

22. The noise on receive antenna is independent from the noise on the other _______

23. At _________antenna, the channel h is known at the receiver

24. is the ______ symbol and n is the noise on th receive antenna

25. A major practical issue to design of transmission and reception in relay networks

is_____________________

26. A Generalised Maximum Ratio Combiner (GMRC) at the destination is optimum

for_____________________________

27. It is _______ to generalize the discussions to the case of L M

28. _________ SNR will minimize the probability of wrong decision over x

29. Destination that combines the two received signals based on a _________________ strategy

30.The coefficient can be approximated as =1-2 when is ____________

31.The proposed MRC-based precoding technique is by means of ____________

32.Optical linear transmit and receive strategies for a variety of Min ______ Max _______

33.The slight decrease in Min ______ Max ______SNR is due to the noise accumulation

34.Relay and Destination nodes are equipped with two antennas with M=N= _______

35.Numerical results show the proposed trans receive techniques can improve the

________ SNR

36.Two natural questions of relay networks are problems of ________ and _______strategies

37. The destination that combines the two signals using two weight vectors w1 and

w2 to construct the ______ signal

38.The transmitter symbol x is precoded at ______ by precoder w

39.The transmitter symbol x is precoded at ______ by precoder vector w

40.Transmitters are equipped with _____ antennas when the receiver has N antennas

UNIT-2

1. When the mobile unit is moving from one zone to another zone, call will be continued by a

process called ______________

2. The average calling time is assumed to be_____________

3. The frequency reuse scheme can be used in _________ domain

4. Co channel interference reduction factor is given by Q = _______

5. The threshold level set for a noise limited system to provide hand off is _______ dBm

6. The C/I value at the cell boundary for handoff should be _________ dB

7. Hand off is classified based on _________ and _____________

8. FCC means______________________________

9. MTSO means ____________________________

10. The average of the MOS for Voice calls obtained from the listeners called________________

11. Frequency reuse distance is determined by D=____________

12. If the MOS is 5, then the voice quality is _________

13. In _________, Soft handoff technique is used

14. GSM means _____________________________

15. The frequency reuse distance of a 7-cell reuse pattern is D =

16. __________ acts as interface between MTSO and the mobile units.

17. ___________ reduces the neighboring cell interferences & enhances weak spots.

18. Propagation path loss slope in a mobile environment is assumed to be ___________

19. Voice quality is decreased due to ____________ fading.

20. ___________ Interference is due to common use of same frequency channel.

21. The diversity scheme is applied at the __________end of the antenna.

22. Frequency reuse spectrum utilization factor M0 =

23. In TDMA, the total no. of bits per frame is bT =

24.The blocking probability for no queuing on either the originating or handoff call B0 = ____________

25. When the terrain contour blocks the direct wave path, we call it as ____________________

26. Thermal noises are _______________ noise

27. The usage of same frequency in different locations is called ______ _________ scheme

28. Hard handover technique used in ___________ and ____________________

29. The MOS of toll Quality voice is _____ _____

30. In Q calls, if one call is dropped then the call drop rate is given by _______________

31. The angle of wave arrival at the mobile unit is called ground _______ _________

32._______________ database contains subscribers information and current location of the subscriber

33. If there is a possibility of call drop due to non-availability of voice channels, is called _______ call

34. If the average calling time is 1.76 then the offered load can be derived as A = ____________

35. In Q calls if one call is dropped, then the call drop rate is given by ________

36. If the MOS is 3 then the voice quality is______

37. Cellular system performance depends on __________ Quality

38. Total traffic in teletraffic theory A= ______

39. Units of Cellular traffic are in __________________

40. Ao= user call rate x average call rate is ________________

UNIT-3

1. CDMA stands for _______________________________

2. CDMA was first employed in the ___________ generation IS-95 cellular standard

3. The multiple access is at the heart of modern wireless technologies, especially _______and __________

Cellular technologies

4. CDMA as the name suggests, is a multiple access technology based on _________ division

5. The advantage of CDMA over conventional cellular system is __________ suppression

6. A jammer is basically a malicious user in a communication network who transmits with a very high

Power to cause _____________________

7. The idea of graceful degradation is key to understanding the big advantages of ________ networks

8. The important advantage of CDMA is its ability to achieve ___________ gain via multipath scatter

Components

9. The term multipath diversity and is achieved through coherent combining of the ________ Signal

Components employing a rake receiver

10. The unique advantage of CDMA is the ability of a _________ operation

11. The term HSDPA stands for _________________________________________

12. The term HSUPA stands for ____________________________________________

13. The _______________ technique is the heart of modern wireless technologies especially 3G and 4G

cellular techniques

14. The term FDMA stands for_____________________________________

15. The correlation property is one of the most important properties of _______________sequence

16. The run-length property is defined as a string of ____________ values

17. The maximum-length PN sequence is of length is ______________________

18. The balance property basically supports the notation of a noise like _______ chip sequence

19. In Code Division Multiple Access (CDMA), sequence of code is called_____________

20. When we represent data in Code Division Multiple Access, a station is idle then it sends _____

21. The OFDM forms the basis for __________ generation wireless communication systems

22. The OFDM is a key broadband technology which supports data rates in excess of _________ Mbps

23. The LAN standards such as 802.11a/g/n are based on __________

24. OFDM is used in 4G cellular standards such as ________ & _________

25. The term OFDM stands for _________________________________

26. OFDM divides the available wide band amongst a set of___________ overlapping subcarriers

27. The presence of carrier frequency offset introduces inter-carrier interference in _________ systems

28. The peak-to-average power ratio is critical problem in _________ system

29. The SC-FDMA can be employed to reduce the peak to average power ratio in a ___________ system

30. The SC-FDMA receiver incorporates two new blocks compared to the ___________ receiver

31. The concept of cyclic prefix which is an important component of an __________ system

32. In Code Division Multiple Access (CDMA), sequence is made of _____________ elements

33. Code Division Multiple Access (CDMA) differs from Time Division Multiple Access (TDMA) because

there is no _______________

34. In Code Division Multiple Access, orthogonal sequence is unique for each _____________________

35. The _______________ is a spread spectrum multiple access technique.

36. The _______________ consistently provides better capacity for voice and data communications than other

commercial mobile technologies

37. Code Division Multiple Access (CDMA) is a __________ cellular technology used for mobile communication

38. The _________ Codes are most commonly used in the orthogonal codes of CDMA applications

39. The technicality of _____________ technology has given significant advantages over other parallel

technologies in terms of spectrum efficiency and overall performance.

40. Direct Sequence Code Division Multiple Access (DS-CDMA) is a technique to ____________ users by

different codes

UNIT-4

1) _________is awirelesstechnology for transmitting large amounts of digital data over a wide

spectrum offrequencybands with very lowpowerfor a short distance.

2) The UWB has ____________ & _________modulation modes

3) The frequency range of UWB is _____________________

4) The advantage OF UWB is ________, ___________ & _______________

5) The UWB can be used in __________, ___________ & _____________

6) The UWB is ___________ mechanism

7) Ultra wideband (UWB) communication is based on the transmission of very ________ pulses with relatively low energy

8) Ultra wideband (UWB) communication is based on transmission of very short pulses with relatively ______energy

9) The main feature of the UWB technology provides the capability of _________ position, which has already been

used in the radar applications and is now underway in the wireless communications.

10) The UWB radio signal occupies a bandwidth of __________

11) Bandwidth of the UWB technique is _______________

12) The major feature of ______________ technique is the very low transmit power

A) Very low transmit power B) very high transmit power C) medium transmit power D) None

13) The low transmit power in UWB (in the order of microwatts) causes a ____________ interference to the existing

systems

14) The low transmit power in UWB in the order of____ watts

15) Conventional wireless systems (WLAN) transmit with a MAX bandwidth of ___________

16) UWB Antennas are_______

17) UWB is a________ communication scheme

18) UWB utilizes______ second impulses

19) UWB technology has had applications in _______

`

20) Ultra-wide band wireless radios send __________ pulses over a broad spectrum

21) MIMO technology has been standardized for _______, ________& __________ networks

22) MIMO technology can be used in ______ communication systems

23) MIMO is a technique where multiple antennas are used at both the transmitter and the receiver to increase the ________

24) MIMO is a technique where_______ antennas are used at both the transmitter and the receiver.

25) One major source of fading is________ propagation

26) We can createtransmit diversityby using multiple antennas at the transmitter. This configuration is

Called _____________

27) We can createreceiver diversityby using multiple antennas at the receiver. This configuration

is called___________.

28) _________starts when multiple antennas are used both at the transmitter and the receiver

29) The main forms of MIMO are ______& ___________

30) Diversity coding is used to increase________ in the presence of fading conditions

31) The Alamouti code is one of the most popular space-time block codes used for _____ x ___diversity coding.

32) Spatial multiplexing exploits the same concept of multiple propagation channels, but to increase the _____

efficiency instead of the link reliability.

33) The transceiver design based on the SVD of the MIMO channel matrix is usually called _____ mode

transmission

34) When the individual streams are assigned to various users, this is called________

35) The purpose of spatial diversity is to make the transmission __________ robust

36) Spatial multiplexing is not intended to make the transmission_____ robust rather it increases the data rate.

37) MIMO exploits the space dimension to improve________________________

38) MIMO-OFDM the corner stone of future broadband wireless access is ____________________

39) In wireless communication the propagation channel is characterized by multipath propagation due to______

on different obstacles

40) MIMO is an antenna technology that is used in________ equipment for wireless radio communication

UNIT-5

1) ___________ is a 3G Standard

2) __________ is a 4G STANDARD

3) _________ switching technique can be used in 3G

4) __________ switching technique can be used in 4G

5) ______ codes are used for error correction in 3G

6) _________ codes are used for error correction in 4G

7) The download rate in 3G is around _________

8) The download rate in 4G is around __________

9. The frequency band of 3G is _____________

10) The frequency band of 4G is ____________

11) The upload rate in 3G is____________

12) The upload rate in 4G is_____________

13) ___________________________ network architecture is used in 3G

14) __________________________ network architecture is used in 4G

15) GSM Stands for _____________________

16) WCDMA Stands for _______________________________

17) GPRS Stands for_______________________________

18) LTE Stands for_______________________________

19) Wimax Stands for ________________________________________

20) GSM is subscriber identity module card ---- True/ False

21) WCDMA is an internal memory storage type ----- True / False

22) GPRS uses __________________switching technique

23) GPRS data rate up to _______ is possible

24) The GPRS maximum data rates realistically achievable under most conditions will be in the range of

____________________________

25) In the GPRS, _______ coding scheme applies the highest level of error detection and correction

26) WCDMA Data rate is up to __________

27) WCDMA is also called as___________

28) The UMTS data speed is up to _________

A) 2Mbps B) 1 Mbps C) 2kbps D) 1kbps

29) The frequency band for WCDMA in Asia is ___________

30) LTE uses _________ modes

31) All LTE devices have to support multi antenna system called _______

32) LTE was introduced to get ______data rates

33) LTE supports for the services such as _________, ___________ & _________

34) LTE supports flexible band width from ______ to ________

35) LTE is having ______ latency

36) Wimax is based on ________ specification

37) WiMax works at a spectrum efficiency / density of ___________

38) The frequency band of WiMax is __________

39) The bandwidth efficiency of WiMax is ______________

40) _________ & __________ modulation is used in WiMax

Name of the SubjectPage 1