1. Cellular Wireless Networks:
Importance of Wireless
Freedom of movement
No loss of connectivity
Increase in productivity
Cellular Network Organization
Use multiple low-power transmitters (100 W or less)
Areas divided into cells
Each served by its own antenna
Served by base station consisting of transmitter, receiver, and
control unit
Band of frequencies allocated
Cells set up such that antennas of all neighbors are equidistant
(hexagonal pattern)
Frequency Reuse
Adjacent cells assigned different frequencies to avoid interference or crosstalk
Objective is to reuse frequency in nearby cells
10 to 50 frequencies assigned to each cell
Transmission power controlled to limit power at that frequency escaping to adjacent cells
The issue is to determine how many cells must intervene between two cells using the same frequency
Importance of Wireless
Freedom of movement
No loss of connectivity
Increase in productivity
Cellular Network Organization
Use multiple low-power transmitters (100 W or less)
Areas divided into cells
Each served by its own antenna
Served by base station consisting of transmitter, receiver, and
control unit
Band of frequencies allocated
Cells set up such that antennas of all neighbors are equidistant
(hexagonal pattern)
Frequency Reuse
Adjacent cells assigned different frequencies to avoid interference or crosstalk
Objective is to reuse frequency in nearby cells
10 to 50 frequencies assigned to each cell
Transmission power controlled to limit power at that frequency escaping to adjacent cells
The issue is to determine how many cells must intervene between two cells using the same frequency
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