HW 4_Cell_BT_S_10

HW 4_Cell_BT_S_10 - Prof. Dzhanidze R. CS M117, HW #4 1...

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Prof. Dzhanidze R. CS M117, HW #4 UNIVERSITY OF CALIFORNIA, LOS ANGELES CS M 117 Students Name ___________________ Homework #4 (Due: 04/28/10) (HW and solutions must be typed) Theory Section Cellular communications 1. (2) In a typical mobile phone system with hexagonal cells, it is forbidden to reuse a frequency band in an adjacent cell. If 840 frequencies are available, how many can be used in a given cell? 2. (1) Sometimes when a mobile user crosses the boundary from one cell to another cell, the current cell is abruptly terminated, even though all transmitters and receivers are functioning perfectly. Why? 3. (2) D-AMPS has appreciably worse speech quality than GSM. Is this due to the requirement that D-AMPS be backward compatibility with AMPS, whereas GSM had no such constraint? If not, what is the cause? 1
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4. (4) Calculate the maximum number of users that D-AMPS can support simultaneously within a single cell. Do the same calculation for GSM. Explain the difference.
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HW 4_Cell_BT_S_10 - Prof. Dzhanidze R. CS M117, HW #4 1...

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