| 摘要 |
A method for selecting a tower-top low-noise amplifier (LNA) having a given level of performance which matches the level of performance needed for a PCS base station includes providing a PCS base station having an antenna, a cable, and a cell. The antenna, the cable, and the cell have an associated loss and noise figure. The noise figure of the antenna is estimated using internal and external antenna noise temperatures. The external antenna noise temperature accounts for contributions due to lightning noises, atmospheric emission noises, celestial noises, ground noises, and man-made noises including microwave oven noises. The noise figure of the PCS base station is then estimated based on the noise figures of the antenna, the cable, and the cell. An LNA having a gain and a noise figure which cause the estimated noise figure of the PCS base station to fall within an acceptable range is then selected for the PCS base station.
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