(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?
(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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