Since this is an indoor deployment scenario we have reduced the various implementation loss due
to the in-vehicle loss. And because of the additional loss due to the building penetration we have
reduced the propagation path loss to provide a meaningful case.
5.4.1 Areas under Control to Aid Performance Trade-offs
In the previous section, we have presented a reasonably complete link budget of a wireless communication
system. Its purpose was to derive the required SNR for the particular set of system values
chosen. Once this equivalent Eb/No value is derived, we can then use the performance improvement
techniques presented in this chapter to achieve the requirements. In this section, we will discuss the
particular areas under control in the link budget calculation. In other words, what specific parameters
can be adjusted in order to obtain not only a reasonably required SNR, but also a practical communication
system.
PERFORMANCE IMPROVEMENT TECHNIQUES 287
TABLE 5.6 Link Budget Example for Outdoor Scenario
a Transmit power 21 dBm
b Transmit cable loss 2 dB
c Transmit antenna gain 18 dBi
d Receiver Antenna Gain 0 dBi
e Receiver cable loss 0 dB
f Thermal noise density 174 dBm/Hz
g Interference density 174 dBm/Hz
h Total inter noise density 170.
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