# Wireless Networking - Unit Wise Questions

Unit 1: Introduction
94 Questions

1. What are the difference between wired and wireless communication networking? Explain the wireless communication standards. (2+4)

6 marks | Asked in 2075

1. Explain the challenges in wireless communication networking. Define wireless communication standards.(3+3)

6 marks | Asked in 2071

1. Discuss about the difficulty of wireless communication network. Write the features of 3rd generation wireless communication network.(4+2)

6 marks | Asked in 2073

1. What are the challenges to implement Wireless Communications over the diverse geographic distribution at rural Nepal? Suggest best wireless communication standards to avoid the challenges identified.(6)

6 marks | Asked in 2076

1. Define wireless communication. Compare first and second generation cellular system. [1+5]

6 marks | Asked in 2067

2. Find the median path loss using Okumura's model for d = 50km, the = 100m, hre = 10m in a suburdan environment. If the base station transmitter an EIRP of 1KW  at a carrier frequency of 900MHt. Find the power at the receiver (assume a unity gain receiving antenna).(6)

6 marks | Asked in 2073

2. A GSM system operating at 900 MHz needs a receiver sensitivity of 50 dBm at a distance of 500m from the transmitter. Transmitting antenna gain and receiving antenna gain are 10dB and 8dB respectively. At what power level the signal should be transmitted to satisfy the above condition? Use free space path loss model. [6]

6 marks | Asked in 2067

2. Explain the linear time-invariant channel model.(6)

6 marks | Asked in 2071

2. What is the difference Wireless LAN and Wireless PAN? Describe the basics of wireless MAN.(6)

6 marks | Asked in 2076

1. What do you mean by multipath propagation? Explain the effects of multipath propagation briefly. Calculate the median path loss using Okumura’s model for the distance of 30Km with base station antenna height of 30m and mobile station height of 2m in a suburban environment. If the base station transmitter radiates an EIRP of 1KW at a carrier frequency of 900MHz, find the power at the receiver (assume a unity gain receiving antenna).

10 marks | Asked in Model Question

1. What are the advantage of Wireless Network? Discuss the development of 1G to 3G Wireless Network.

6 marks | Asked in 2069

2. Explain the types of small scale fading (including time delay and Doppler spread) (6)

6 marks | Asked in 2075

1. What are the major challenges in wireless communication network? How can we combat those challenges? (3+3)

6 marks | Asked in 2068

2.Consider a Transmitter which radiates a sinusoidial carrier frequency of 1850 MHz. For a vehicle moving 60mph, compute the received carrier frequency if the mobile is moving (a) directly towards the transmitter.(b)directly towards the transmitter and (c) in direction which is perpendicular to the direction of the transmitted signal.(2+2+2)

6 marks | Asked in 2069

3. The transmitted signal is given by:

g(t) = e-ut, 0 ≤ t ≤ T

where T is the symbol interval. The signal is corrupted by additive white Gaussian noise with zero mean and two-sided power spectral density none wat / Hz. The optimum detector is the matched filter.

a) Find the sketch impulse response of the filter which is matched to the original g(t).

b) Derive the output of the filter.(3+3)

6 marks | Asked in 2073

3. Explain the power spectral density with example.(6)

6 marks | Asked in 2071

3. Discuss briefly any two digital modulation techniques. (3+3)

6 marks | Asked in 2075

2. What are Doppler Effect and Doppler shift? Calculate Doppler shift for a person walking at a 3 km/hr in 900 MHZ cellular system. (6)

6 marks | Asked in 2068

2. What is conflict free multiple access? List out the conflict free multiple access technologies used in wireless communication and explain each briefly.

10 marks | Asked in Model Question

3. Define modulation. Explain minimum shift keying (MSK) modulation technique. [1+5]

6 marks | Asked in 2067

3. Briefly explain the pass loss model and the 4-PSK Modulation technique.(6)

6 marks | Asked in 2076

4. What do you mean by channel impairment mitigation techniques? Explain.(6)

6 marks | Asked in 2071

1. Calculate the median path loss using Okumura's model for the distance of 75km with base station height of 5m in a saburban environment. If the base station transmitter radiates an EIRP of 1KW at a carrier frequency of 900MHz, find the power at the receiver assuming unity gain for the receiving antenna.[10]

10 marks | Asked in 2076 (new)

4. What are the techniques to mitigate fading effects in wireless communications? Briefly discuss different types or diversity.(3+3)

6 marks | Asked in 2076

3. Draw the transmitter and Receiver of QPSK and derive the expression for transmitted signal and received signal.(6)

6 marks | Asked in 2069

4. Explain the types of diversity with its application example. (6)

6 marks | Asked in 2075

4. Why diversity is used in wireless communication? Explain different diversity mechanism. [1+5]

6 marks | Asked in 2067

4. What is modulation? Discuss the advantage and disadvantage of QPSK.(2 + 2 + 2 )

6 marks | Asked in 2073

3. Define modulation. Explain QPSK modulation technique.

6 marks | Asked in 2068

3. What is interference? Explain the co-channel and adjacent channel interference? How can the effects of such interferences be minimized? Explain briefly.

10 marks | Asked in Model Question

5. What is the difference between co-channel interference and adjacent channel interference? Derive the equation for the signal to interference ratio. (2+4)

6 marks | Asked in 2075

5. Define cell cluster concept. Explain the call blocking and delay at the cell-site.(6)

6 marks | Asked in 2071

2. Differentiate between low pass, and pass, and high pass transmission. Explain SIP architecture.(4+6)

10 marks | Asked in 2076 (new)

5. Consider a cellular system in which there are total of 1001 radio channels available for handling traffic. Suppose the area of a cell is 6 km2 and the area of the area of the entire system is 2100km2.

a) Calculate the system capacity if the cluster size is 7.

b) How many times would the cluster of size 4 have to be replicated in order to approximately cover the entire cellular area?

c) Calculate the system capacity if the cluster size is 4.(2 + 2 + 2)

6 marks | Asked in 2073

5. Define co-channel cell. Find the distance between the nearest co-channel cell in hexagonal topology with necessary diagram. [1+5]

6 marks | Asked in 2067

4. Why channel equalization is used in wireless communication? Explain linear channel equalization. (1+5)

6 marks | Asked in 2068

5. Discuss benefits and drawbacks of Mobile Ad-Hoc networks.(6)

6 marks | Asked in 2076

4. Determine the power spectral density (PSD) of BPSK signal. Compare the PSD of QPSK, MSK and BPSK.(4+2)

6 marks | Asked in 2069

6. Explain the causes of channel interference. Determine Frequency reuse distance for cell radius 5KM and cluster sire of 7.(2+4)

6 marks | Asked in 2076

8. What is the meaning of frequency re-use and re-framing? Explain with example. (6)

6 marks | Asked in 2075

6. Define the following terms properly. (3x2)

b) Random Access

c) Control Channel

6 marks | Asked in 2075

5. Define co-channel interference and adjacent channel interference. In a cellular system, the acceptable signal-to-cochannel interference ratio is 20dB. From the measurement the path loss exponent is found to be 4. What is the minimum cluster size? (2+4)

6 marks | Asked in 2068

6. Explain the conflict-free multiple access technologies.(6)

6 marks | Asked in 2071

6. What is interference? Write the type of interference in cellular system. Derive the expression for frequency reuse ration in terms of signal to interference ratio.(1 + 2 + 3)

6 marks | Asked in 2073

3. What is conflict free multiple access? List out the conflict free multiple access technologies used in wireless communication and explain each briefly.(2+8)

10 marks | Asked in 2076 (new)

5. Prove the acual between the centers of two adjacent co channel cells D = √3N R (6)

Where N = Cluster size

R = Radius of hexagonal cells.

6 marks | Asked in 2069

6. Define adjacent channel interference. Explain how adjacent channel interference can be reduced. [2+4]

6 marks | Asked in 2067

7. Explain frequency division multiple access technique. [6]

6 marks | Asked in 2067

7. How cell sectoring can be used to increase the capacity of a cellular system? Explain. What are the drawbacks of cell sectoring? (4+2)

6 marks | Asked in 2075

7.What is CDMA? Write the advantage and disadvantage of CDMA over DMA and FDMA techniques.(2+2+2)

6 marks | Asked in 2073

6. Consider a cellular system with 416 radio channels available for handling traffic. Suppose 21 of their channel are designed to control channels. Let the average channel holding time of a call be 3 minutes, the blocking probability during busy hours be 2%, and the frequency reuse factor be 9.

a. Determine the number of calls per hour.

b.Determine the signal to channel interference ratio in dB.(3+3)

[At 2% blocking probability with 44 available channel, the traffic load is 34.683 Erlanas]

6 marks | Asked in 2069

4. What are the different wireless communication standards? List out various WLAN standards with typical features of each.

5 marks | Asked in Model Question

6. Explain briefly about different techniques for capacity increase in cellular system.

6 marks | Asked in 2068

7. What is call admission control (CAC)? Explain with example.(6)

6 marks | Asked in 2071

7. What are different multiple access technololgies available for wireless communication? Explain the different types of soft and hard handoffs supported by CDMA systems.(2+4)

6 marks | Asked in 2076

7. Explain time division multiple access technique. (3+3)

6 marks | Asked in 2068

8. Differentiate between internet protocol(IP) and transmission control protocol(TCP).(6)

6 marks | Asked in 2071

8. Define handoff. Explain briefly about different handoff strategies. [2+4]

6 marks | Asked in 2067

8. Write the steps of handoff procedure in intraswitch Handoff Design. Explain with suitable signaling sequence diagram.(6)

6 marks | Asked in 2073

8. What are the differences between cell splitting and cell sectoring? Explain the concept of mobility management with the basic functions performed by the location management.(2+4)

6 marks | Asked in 2076

5. What is bandpass transmission? Why is it used? Explain MPSK.

5 marks | Asked in Model Question

7. What is multiple Access? What are the type of multiple Access? Why CDMA is superior than TDMA.

6 marks | Asked in 2069

6 marks | Asked in 2073

6. What is handoff in wireless communication? When is it required? Explain the handoff management procedure.

5 marks | Asked in Model Question

9. Explain in detail the wireless Ad-Hoc network with neat diagram. (6)

6 marks | Asked in 2075

9. Write briefly on operation of mobile IP. [6]

6 marks | Asked in 2067

8. Describe the steps involved in setting up the call between MSC and the called MSC with flow diagram. (6)

6 marks | Asked in 2068

8. Write the procedure for location update and call setup for the two-tier network architecture of IS-41.(6)

6 marks | Asked in 2069

9. Differentiate between co-channel and adjacent channel interface.(6)

6 marks | Asked in 2071

9. Define the following terms properly:(3x2)

a) Large scale path loss

b) Frequency re-uae

c) Frequency re-farming

6 marks | Asked in 2076

6 marks | Asked in 2069

9. Write short notes on MIPv6. Also mention the advantages over MIPv4. (6)

6 marks | Asked in 2068

10. Write short notes on(any two):(3x2)

a) Channel Assignment Strategies

b) Error probability in the transmission

c) CAC

6 marks | Asked in 2076

10. Write short notes on (any two)

(a) Near-far effect

(b) OFDM

(c) Aloha

(d) Mobile TCP hierarchy

6 marks | Asked in 2067

10. Write short notes on (any two): (3+3)

a) Channel Equalization

b) Forward Channel

c) Transmission Error

6 marks | Asked in 2075

7. How location management is done in cellular networks? Explain briefly.

5 marks | Asked in Model Question

4. Why wireless communication standards are required? Explain IEEE 802 15 (1+4)

5 marks | Asked in 2076 (new)

10. Write short notes on(any two):(2x3)

a) Hard and soft Handoff

b) IP-based Network

c) OFDM transmitter and receiver block diagram

s) EIRP

6 marks | Asked in 2073

10. Write short notes on (any two): (2x3)

b) Decision regions

6 marks | Asked in 2071

10. Write short notes on(any two):

a) Transmission control protocol(TCP)

b) MSK and GMSK

c) Handoff design issues

d) Hata model for path loss

6 marks | Asked in 2069

10. Write short notes on (Any TWO): (2×3)

b) Probability of error of BPSK

c) Aloha

6 marks | Asked in 2068

8. List out the different mobile routing protocols and explain the function of any one protocol.

5 marks | Asked in Model Question

5. Differentiate between time invariant and time variant system with examples.(5)

5 marks | Asked in 2076 (new)

9. What is mobile-TCP? How it differs with classical TCP? Explain with typical features of mobile-TCP.

5 marks | Asked in Model Question

6. What is the use of power spectral density? Define OFDM.(2+3)

5 marks | Asked in 2076 (new)

7. How linear equalization is carried out? Define FDMA.(2+3)

5 marks | Asked in 2076 (new)

10. What are the features of 4G? Explain the challenges to 4G services.

5 marks | Asked in Model Question

8. What is frequency reuse? How can it be achieved? Why is it  necessary?(1+2+2)

5 marks | Asked in 2076 (new)

11. What is software defined wireless networks? Explain with its architecture.

5 marks | Asked in Model Question

12. Write short notes on: (2 x 2.5)

a. Wireless application protocol

b. RFID

5 marks | Asked in Model Question

9. Why handoff is required in wireless communication? Explain its procedure.(2+3)

5 marks | Asked in 2076 (new)

10. Compare and contrast on IPv4 and IPv6 packets. Which is better and why?(4+1)

5 marks | Asked in 2076 (new)

11. What are the vision and main features of 5G? Explain RFID.(2+3)

5 marks | Asked in 2076 (new)

12. Write short notes on(2x2.5)

a. Open BTS

b. Tunneling

5 marks | Asked in 2076 (new)

Unit 2: Wireless Channel Characterization
0 Questions
Unit 3: Wireless Communication Techniques
0 Questions
Unit 4: Fundamental of Cellular Communications
0 Questions
Unit 5: Mobility Management in Wireless Networks
0 Questions
Unit 6: Overview of Mobile Network and Transport Layer
0 Questions
Unit 7: Advances in Wireless Networking
0 Questions