10.Communications by John G. Webster (Editor)

By John G. Webster (Editor)

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Other factors that affect signal quality include the location and velocity of the mobile station. Generally, mobile stations that are located at the edge of a given cell receive a nominal carrier signal. Furthermore, these mobile stations also have a higher probability that the carrier signal is shadowed by some obstruction in the transmission path. Note that line of sight transmission is unlikely in such conditions. Therefore, mobile stations that reside at the fringe of a given cell have a higher probability of receiving excessive cochannel interference than mobile stations residing in the cell’s interior.

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. 514 COCHANNEL INTERFERENCE Intersystem Interference The advent of Personal Communication Services to the wireless industry has developed a number of new opportunities, including higher-quality, less-expensive service; increased opportunities for competition among service providers; and plenty of capacity to support the ever-increasing demand for wireless communication services.

The overload will not only damage a system, but will also result in serious distortion due to nonlinearity in a communication system. Therefore, there is a difficult tradeoff between increasing and reducing speech signal levels. All these problems can be solved by the use of a compandor. ’’ According to whether a compandor operates on an analog signal or a digital signal, it can be categorized as an analog compandor or a digital compandor. An analog compandor operates on a continuous time analog signal and compresses the dynamic range of a speech signal continuously at a syllabic rate.

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