| 摘要 |
<p>The present invention provides a receiver unit for a central terminal of a wireless telecommunications system arranged to receive signals from a plurality of subscriber terminals. The receiver unit comprises a first processing circuit for processing a received signal, passed to the first processing circuit via an input signal path, to produce a processed signal, a reference signal generator for generating a reference signal having a reference signal parameter that is substantially temperature independent over a predetermined temperature range, and an inserter for inserting the reference signal on the input signal path used to pass the received signal to the first processing circuit. Further, the receiver unit comprises a detector for detecting the reference signal parameter of the reference signal output from the first processing circuit, and a gain controller, responsive to the reference signal parameter detected by the detector, for adjusting the gain of the first processing circuit to cause the reference signal parameter detected at the detector to be a predetermined reference signal parameter. By such an approach, the receiver unit can be automatically calibrated so that a signal received at the antenna of the central terminal at a specified power level will produce an output signal from the receiver unit at a desired voltage level.</p> |
