Wireless Communication — Summer 2022

Discuss in a detail about the major tradeoff between channel capacity and Co-channel interference in cellular system.

Explain Handoff mechanism in mobile communication with their types and important parameters.

Derive the formula to find the signal to interference ratio for hexagonal cell shape in cellular environment. Acellular service provider decides to use digital TDMA system which can tolerate a signal to interference ratio is 15 dB in worst case. Find the optimal value of cluster size (N) for omni directional antenna, Assume path loss component n=4.

Discuss channel assignment strategies in mobile in communication? State the difference between voice channel and control channel.

What is near-far problem in mobile communication? Suggest the steps to reduce near-far effect.

Explain cell splitting concepts in a brief and shed the light on importance of cell splitting in communication.

What is Micro-cell zone concept? Explain the concept in a brief and enlist the merits of Micro-cell zone concept over conventional cellular structure.

State the difference between large and small-scale propagation loss?

What are the Fresnel zones? How the signals are differed if they came out from two different Fresnel zone at receiver?

Derive the equation for Frill’s formula and solve the following problem. In a communication system, transmission power is of 50 W, gain of transmitter and receiver are unity and the distance between transmitter and receiver is 2 K.M. Find the received power in decibel. Assume operating frequency is 900 MHz and consider line of sight Communication between transmitter and receiver.

State the difference between coherence bandwidth and coherence time and explain how rms delay spread and doppler effect plays important role in deciding these two parameters.

Explain following terms in a detail: 1. Frequency selective Fading 2. Flat fading1

Derive the equation for doppler frequency. Find the doppler frequency in following three cases, if the transmitter is moving with 60 miles/hour, assume operating frequency is 1850 MHz

Explain Time Division Multiplexing (TDMA) and state the merits of TDMA over Frequency Division Multiplexing (FDMA).

Explain Frequency Hopping concept in CDMA with example.

Draw transmitter and receiver structure of CDMA system and give the proper insight about their working for the case of Direct Spread Spectrum (DSSS).

State the important steps to establish the call in GSM.

What is OFDM scheme? How it is differed than FDM?

Explain and draw GSM architecture with all the important components and elaborate their functions in a detail.

Explain functionality of following GSM channels. 1. Paging Channel 2. Random Access Channel 3. Access Grant channel

What is a rake receiver, state their importance in communication?

Draw the frame structure of GSM with all the important fields and explain GSM frame hierarchy.

Explain Bluetooth technology with the important parameters.

State the difference between Wi-Fi and WiMAX technology.

What is ZigBee, Explain the Zigbee technology with proper insight.2