A Tower Mounted Amplifier (TMA)
has a low noise figure and some gain. If it is mounted as closely as possible
to the receive antenna, it can improve uplink sensitivity at the antenna, thus
increasing the cell radius. There will be an improvement if the radio link is
truly noise limited. If the system is uplink interference limited, there will
be no improvement using a TMA. A TMA can degrade performance if the gain is set
too high. There will be intermodulation effects due to larger signals, such as
terminals close to the base station. Best results are achieved when the TMA
gain is used to compensate for the feeder loss.
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