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Modern communication systems for speech and data – mobile radio, cordless telephones and pagers – transmit information by means of digital modulation. This means that all the information is modulated onto the transmit signal in the form of bits. The quality of the receiver in the transceivers used for this purpose is judged by measuring bit error rate at low receive levels. For this purpose a link is set up to the mobile radio (or base station) and a known data sequence is transmitted. The transceiver then sends ...
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