(a)  Uplink frequencies are higher than downlink frequencies in satellite communication, whereas the reverse is true for mobile communication. Explain with example each. (b) Determine the isotropic free space loss at 8 GHz for the shortest path to a geosynchronous satellite from earth (40,000 km). Suppose that the antenna gain of both the satellite and groundbased antennas are 42 dBi and 50 dBi, respectively, what will be the new free space loss. Now, assume a transmit power of 300kW at the earth station. What is the power received at the satellite antenna?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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(a)  Uplink frequencies are higher than downlink

frequencies in satellite communication, whereas the

reverse is true for mobile communication. Explain with

example each.

(b) Determine the isotropic free space loss at 8 GHz for

the shortest path to a geosynchronous satellite from

earth (40,000 km). Suppose that the antenna gain of

both the satellite and groundbased antennas are 42 dBi

and 50 dBi, respectively, what will be the new free

space loss. Now, assume a transmit power of 300kW at

the earth station. What is the power received at the

satellite antenna?

(c) If 60MHz of total spectrum is allocated for a duplex

wireless cellular system and each simplex channel has

15kHz RF bandwidth, find:

(a) The number of duplex channels

 

(b) The total of channels per cell site, if

i=3 and j = 3 cell reuse is used.

Repeat the above using TDD. Find the system

capacity (C) for the reuse cell, if N is replicated (M) is 5.

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