Download e-book for kindle: 10.Communications by John G. Webster (Editor)

By John G. Webster (Editor)

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The antenna height at the base station dictates the coverage of the base station. Therefore, the taller the antennas, the less power they are allowed to transmit. There is a tradeoff between the coverage of and the amount of interference emitted by a certain base station. The antenna height must be designed to reduce the amount of interference to the neighboring base stations. IS-95 This subsection deals with the receiver issues for IS-95 systems. The following FCC requirements are extracted from Refs.

Selection of multiple access technique, cell layout design, and frequency plan). In the section entitled ‘‘Intrasystem Interference,’’ we discuss self-interference and its relationship to various system design parameters such as the frequency reuse factor and the frequency reuse distance. On the other hand, the proliferation of so many PCS licenses in such a small spectral allocation imposes some unique challenges to wireless system engineers regarding interference management and mitigation. In the PCS industry, up to six operators will provide service to the same service area via adjacent frequency bands.

When a compandor is not used, weak speech signals are vulnerable to additive noises when their power levels are significant. When a compandor is used, the dynamic range is compressed toward the focal point. Therefore, the levels of weak signals are raised and the power level differences between weak signals and additive noises are increased. After the expandor, the power level differences between signals and noises are further extended. This is the noise advantage of a compandor. Crosstalk Advantage.

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10.Communications by John G. Webster (Editor)


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