Radio transmitter testing method for use in communication system e.g. UMTS, involves comparing feed-back and reference signals to generate error vector, and correcting gain difference between transmitted and feed-back signals

摘要

The method involves transmitting a signal on a preset radio channel, and conveying the signal to a feedback loop to create a feed-back signal. A gain difference between the signals is corrected. The transmitted signal is delayed to produce a reference signal that is compared with the feed-back signal to generate an error vector. A test alarm is created if the vector does not fulfill preset criteria. An independent claim is also included for a base station comprising a feedback loop with a variable attenuator and a signal analyzer.