发明公开
EP1299979A1 DIRECT DIGITAL SYNTHESIS IN A QAM DEMODULATOR 审中-公开
直接数字合成IN A QAM DEMUDULATOR

DIRECT DIGITAL SYNTHESIS IN A QAM DEMODULATOR
摘要:
A QAM demodulator is disclosed, which comprises two direct digital synthesizer circuits, for the provision of carrier synchronisation. The first DDS is located upstream of the receivers root-raised-cosine filter, and ensures frequency synchronisation, whilst the second DDS is downstream of the filter and ensures phase synchronisation.
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