Wireless Communication 2018 Question Paper — Government College of En…
The 2018 Wireless Communication previous year question paper (Government College of Engineering and Technology, Jammu), with every question and its marks.
- University: Government College of Engineering and Technology, Jammu
- Subject: Wireless Communication
- Course: Wireless Communication
- Branch: ELECTRONICS & COMM. ENGG.
- Year: 2018
- Paper: end-term
- Duration: 180 minutes
- Total marks: 100
Instructions
- Attempt five questions in all, selecting at least two from each section.
Questions
Section-A
- Q1. (a) Give reasons for the following : (i) Hexagonal geometry is used for cellular structure (ii) The difference between handoff threshold and minimum acceptable signal should not be large. (iii) Use of Umbrella cell along with small cells. (iv) Preference of microcell zone concept over sectoring to increase the capacity. (v) Increasing the cluster size will decrease the system capacity. [10] (b) What is Hand-off and how is it achieved ? [10] [20 marks]
- Q2. (a) What is co-channel interference ? If the acceptable signal to co channel interference ratio in a certain system is $20\text{ dB}$ and $k = 4$. What is the minimum cluster size ? [10] (b) What are the different techniques used for increasing the system capacity ? Explain cell splitting in detail with aid of diagram. [10] [20 marks]
- Q3. (a) What is the requirement of propagation model ? Explain Okumara model in detail. [10] (b) For a line of sight scanario, what small scale propagation model should be used. Explain the model in brief. [10] [20 marks]
- Q4. (a) What is the difference between large scale and small scale fading. What are different types of small scale fading due to time delay spread. [15] (b) Explain Ricean Fading Distribution Model for small scale fading. [5] [20 marks]
Section-B
- Q5. (a) What is Diversity and what is its need ? [5] (b) Explain Space Diversity processing techniques in detail. [15] [20 marks]
- Q6. (a) Given a cellular system in which one-way bandwidth of the system is $12.5\text{ GHz}$, channel spacing is $30\text{ kHz}$ and guard band at each boundary is $10\text{ kHz}$. If cellular area is $6\text{ km}^2$, frequency reuse factor is $7$ and $21$ channels are used for control channels. [10] Calculate : (1) The total number of channels per cluster. (2) The number of data channels per cluster. (3) The number of data channels per cell. (4) The system spectral efficiency in channels/$\text{MHz/km}^2$. [10] (b) Explain the concept of CDMA and FDMA. [10] [20 marks]
- Q7. Explain $\pi/4$ QPSK modulation system in detail ? How is it different from conventional QPSK system. [20] [20 marks]
- Q8. (a) Explain different control channels of GSM system. [10] (b) Give frequency and channel specifications of CDMA (IS-95). [10] [20 marks]
Related pages
Other years
- Wireless Communication 2018 question paper — end-term
- Wireless Communication 2018 question paper — supplementary