10.Communications by John G. Webster (Editor)

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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. If the mobile is moving at high speeds, the received carrier signal suffers from fast fading. Therefore, even though the CIR is under static conditions, it is large enough to maintain reliable communications. Under fading conditions, the CIR periodically drops below the threshold required to maintain reliable communication.

Similarly, Eq. (2) shows that an expandor has a 1 : 2 power expansion ratio. According to the decibel versions of Eqs. (1) and (2), the operation of a compandor with a 2 : 1 power compression ratio and a 1 : 2 power expansion ratio on various input power levels is shown in Fig. 2. The 0 dB point in the figure is referred to as a focal point, which is a reference power level at which both compression and expansion are not functioning. It was assumed that the input speech signal level varies between ϩ20 and Ϫ60 dBm.

Each operator may use any of eight standardized technologies, each with different emission characteristics and performance requirements. Furthermore, no coordination procedures exist between any operators that provide service to the same area. This potentially dangerous situation increases the likelihood of a unique type of interference called PCS-to-PCS Interference (PPI). PPI occurs when the in-band or out-of-band emissions of one (of- fending) PCS system, with a given technology and system layout, interferes with receivers (usually mobile subscriber receivers) of another (victim) PCS system with a different technology and different system layout.

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