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Extra resources for 10.Communications
To analyze the amount of interference, the metric used is the degradation in receiver sensitivity also called receiver desensitization and the threshold for impact when the interference power plus the existing thermal noise plus the in-system interference power is 3 dB above the original interference plus thermal noise power. For example, a 3 dB receiver desensitization reduces the effective system range and reduces the cell size by 15% to 30%. The propagation environment is modeled using a two-slope path loss model (24) as 4hb hm λ 2 4πr , r ≤ rt Path loss = λ rt = Path loss = 4πr 2 λrt (5) 2 , r > rt (6) where hm and hb are the heights of the mobile and the base antennas, respectively.
Then a cluster size of three will provide sufficient protection from cochannel interference. This results in an increased frequency reuse factor of and an increase in capacity that exceeds a factor of 2. Indeed, in this example, with an increased frequency reuse of , the provider can assign each cell seven channels rather than three. Hence, the available capacity increases from 126 to 294. 76 dB), wireless systems with a frequency reuse of 1 would then be possible. A CDMA system such as IS-95 with its Rake receiver design is an example of such a system.
In the following study, the IS-95 CDMA standard is used as a representative signal standard. However, the analysis is applicable for different standards such as IS-136, PACS, and PCS1900. FCC Regulations The FCC Rules (17) and the FCC Memorandum (18) state that the base stations are limited to 1640 W peak equivalent isotropically radiated power (EIRP) with an antenna height of 300 m. Base station heights may exceed 300 m but with a corresponding decrease in the radiated power. These requirements are listed in Table 1.
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