Page 401 - Integrated Wireless Propagation Models

T h e l e e C o m p r e h e n s i v e M o d e l - I n t e g r a t i o n o f t h e T h r e e l e e M o d e l s 379

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FIGURE 6.5.3.2 A cascaded syste .
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6.5.4 Required n formation for Calculating Link Budget
The Lee comprehensive prediction model needs to have the items listed as follows:
• Size of cells, macrocell, microcell, or in-building (picocell)
• How many cells and the cell's locations
• Frequency 400 MHz to 2.5 GHz
• Bandwidth . 25 MHz to 30 MHz
1
• Range (feet or miles, meters or kilometers)
• A few runs of measurement data taken at the system-deployed area
Human-made environment, free space, open, rural area, suburban area, urban
area, metropolitan area, microcell, in-building (picocell)
• Terrain condition, degree of undulation, LOS, NLOS, shadow condition
• Antenna gain at the transmitter side and the receiver side
• Noise floor, N = kTB: Use the room temperature T = 290 K = 17 °C, then
kT = -204 dBW = -174 dBm
If bandwidth B = . 25 MHz, the noise floor N = -174 dBm + 81 dB = -93 dBm
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• Feed Line Loss: The length and the diameter of the cable
• Macrocell
1. Human-made environment: free space, open, rural area, suburban area,
urban area, and metropolitan area
2. Digitized terrain maps
3. Specifications of the equipment and the deployed system
4. Special situations: over the water, tunnel, and so on
• Microcell
1. Street layout
2. Building layout
3. Air view map
4. Small-scale terrain map
• In-building
1 . Building layout
2. Floor layout
3. Building and wall material
4. Glass loss

6.5.5 Link Budget Analysis
6.5.5. 1 Required (E /N.),. and Planned (EJN ) 1
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b
0 P
We refer to E/No as the value of bit energy per noise power spectral density, That is bit
per sec/noise per hertz required to achieve a specified error probability. There are a