Radyne QAM256 Installation And Operation Manual
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QAM256 Digital Video Modulator and Upconverter Theory of OperationTM077 – Rev. 4.0 3-1Theory of Operation33.0 Theory of OperationA digital terrestrial interface supplies the modulator with a data stream. The data stream issynchronized if the incoming stream is framed. The data is scrambled, and FEC is added. Thedata is then convolutionally encoded, punctured, then constellation mapped. The resulting I&Qsymbols are digitally filtered. The data is then converted into an analog waveform and is vectormodulated onto an RF Carrier produced from the Transmit IF Synthesizer Circuitry.3.1 QAM256 OperationA block diagram of the signal flow is shown in Figure 3-1 below.Figure 3-1. Functional Block Diagram |
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