Exam Details
| Subject | cellular and mobile comunications | |
| Paper | ||
| Exam / Course | b.tech | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | May, 2018 | |
| City, State | telangana, hyderabad |
Question Paper
(AUTONOMOUS)
B. Tech VII Semester Supplementary Examinations, May 2018
(Regulations: VCE-R11/R11A)
CELLULAR AND MOBILE COMUNICATIONS
(Electronics and Communication Engineering)
Date: 21 May, 2018 AN Time: 3 hours Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1. Define coherence bandwidth. Explain the operation of cellular systems. 7M
List the various limitations of conventional mobile telephone systems. Illustrate the
features and the various blocks of basic cellular system with a neat figure.
8M
2. What is co-channel interference? Illustrate the co-channel Interference reduction factor
with the help of an example and equations.
8M
Interpret the need of Cell splitting and illustrate the different ways of cell splitting using
suitable figure and example.
7M
Unit II
3. Derive the expression for signal to interference ratio for a real time co-channel
interference at mobile radio transceivers.
7M
Discuss the design aspects of Omni directional antenna system in the worst case.
8M
4. Explain how to reduce adjacent channel interference. Draw the characteristics of channel
band filter.
7M
Describe near-end and far-end interference problems in mobile communication.
8M
Unit III
5. Name three steps in obtaining Mobile point-to-point Model. Explain all the steps in detail. 9M
In a mobile radio environment, the average cell site antenna height is about 50m, the
mobile height is about 3m and the communication path length is 5km. Find the incident
angle, elevation angle at the antenna and elevation angle at the location.
6M
6. With the help of neat diagrams explain different types of umbrella pattern antennas. 9M
Draw the radiation pattern of any two types of mobile antenna and describe them in
detail.
6M
Unit IV
7. Illustrate the different types of set-up channels and their operational functions. 9M
List the various techniques for increasing the frequency spectrum utilization.
6M
8. Define the dropped call rate. Why is the perception of the dropped call rate higher by
the subscribers? List the factors for calculating the dropped call rate.
7M
Explain the Initiation and Delaying of a Handoff.
8M
Unit V
9. Name the subsystems of GSM. Explain all the subsystems with a neat diagram. 10M
How many layers are there in open system interconnection of GSM? Describe them in
detail.
5M
10. Explain how multiple access schemes are achieved in GSM. 8M
Write short notes on CDMA. 7M
B. Tech VII Semester Supplementary Examinations, May 2018
(Regulations: VCE-R11/R11A)
CELLULAR AND MOBILE COMUNICATIONS
(Electronics and Communication Engineering)
Date: 21 May, 2018 AN Time: 3 hours Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1. Define coherence bandwidth. Explain the operation of cellular systems. 7M
List the various limitations of conventional mobile telephone systems. Illustrate the
features and the various blocks of basic cellular system with a neat figure.
8M
2. What is co-channel interference? Illustrate the co-channel Interference reduction factor
with the help of an example and equations.
8M
Interpret the need of Cell splitting and illustrate the different ways of cell splitting using
suitable figure and example.
7M
Unit II
3. Derive the expression for signal to interference ratio for a real time co-channel
interference at mobile radio transceivers.
7M
Discuss the design aspects of Omni directional antenna system in the worst case.
8M
4. Explain how to reduce adjacent channel interference. Draw the characteristics of channel
band filter.
7M
Describe near-end and far-end interference problems in mobile communication.
8M
Unit III
5. Name three steps in obtaining Mobile point-to-point Model. Explain all the steps in detail. 9M
In a mobile radio environment, the average cell site antenna height is about 50m, the
mobile height is about 3m and the communication path length is 5km. Find the incident
angle, elevation angle at the antenna and elevation angle at the location.
6M
6. With the help of neat diagrams explain different types of umbrella pattern antennas. 9M
Draw the radiation pattern of any two types of mobile antenna and describe them in
detail.
6M
Unit IV
7. Illustrate the different types of set-up channels and their operational functions. 9M
List the various techniques for increasing the frequency spectrum utilization.
6M
8. Define the dropped call rate. Why is the perception of the dropped call rate higher by
the subscribers? List the factors for calculating the dropped call rate.
7M
Explain the Initiation and Delaying of a Handoff.
8M
Unit V
9. Name the subsystems of GSM. Explain all the subsystems with a neat diagram. 10M
How many layers are there in open system interconnection of GSM? Describe them in
detail.
5M
10. Explain how multiple access schemes are achieved in GSM. 8M
Write short notes on CDMA. 7M
Subjects
- advanced computer networks
- advanced database management systems
- advanced digital signal processing
- advanced structural design
- air line management
- air pollution and control methodologies
- aircraft systems and instrumentation
- analog communications
- artificial intelligence
- automobile engineering
- basic electrical engineering
- basic mechanical engineering
- cad/cam
- cellular and mobile comunications
- cloud computing
- coding theory and techniques
- compiler design
- computational fluid dynamics
- computer architecture and parallel processing
- computer graphics
- computer graphics concepts
- computer networks
- computer organization and architecture
- computer programming
- computer vision and pattern recognition
- concrete technology
- control systems
- cyber security
- data mining and data warehousing
- database management systems
- design and drawing of hydraulic structures
- design for testability
- digital image processing
- distributed databases
- distributed operating systems
- electrical machines-ii
- electromagnetics and transmission lines
- electronic measurements and instrumentation
- embedded netwrok and protocols
- embedded software design
- embedded systems
- engineering drawing-i
- engineering mechanics-i
- engineering physics
- entrepreneurship
- environmental engineering-ii
- environmental science
- finite elements methods in civil engineering
- flexible ac transmission systems
- formal language and automata theory
- grid and cloud computing
- hardware software co-design
- heat transfer
- high voltage engineering
- hydraulic machines
- hydraulics and hydraulic machines
- image processing
- image processing and pattern recognition
- industrial management and psychology
- information retrieval systems
- instrumentation and control systems
- kinematics of machinery
- low power cmos vlsi design
- managerial economics and financial analysis
- microwave engineering
- mobile application development through j2me
- national service scheme
- network security and cryptography
- operating systems
- operations research
- pavement analysis and design
- planning and drawing
- power electronic control of ac drives
- power electronic converters-ii
- power semiconductor drives
- power system generation
- power system switchgear and protection
- principles of electrical engineering
- principles of programming languages
- probability theory and numerical methods
- production technology-i
- programmable logic controllers and applications
- project planning and management
- pulse and digital circuits
- reactive power compensation and management
- refrigeration and air conditioning
- rehabilitation and retrofitting structures
- reliability engineering
- renewable energy sources
- robotics and automation
- satellite and radar communications
- service oriented architecture
- signals and systems
- software architecture
- software engineering
- software project management
- software testing and quality assurance
- speech signal processing
- strength of materials-iibuilding
- structural analysis-i
- surveying-ii
- technical english
- thermal engineering-i
- utilization of electrical energy
- vlsi design
- web technologies
- wireless and mobile computing
- wireless communications and networks