Abstract
The spectrum sharing capability of a CDMA PCN (48 MHz bandwidth), overlayed on the fixed service microwave (FSM) band (1850-1990 MHz), is investigated. This overlay may cause two types of interference: 1) interference from the overlayed PCN on the FSM systems, 2) interference from the microwave system to the PCN users. In the first case, both analog and digital systems are considered, because they are both in operation in the above frequency band. Furthermore, for the digital microwave system performance degradation, most of the modulation methods employed for digital transmission are considered. In the second case, the performance degradation of both the forward and the reverse PCN links are investigated, and, for the forward link, two options are considered: 1) incorporating power control, and 2) a no-power-control scheme. Next, real Fourier transformers and notch filters in the PCN receiver and transmitter are employed, in order to minimize both types of interference, and the above analysis is repeated. >
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