User Manual DDS200 Digital Demodulation System 070-9952-00
User Manual DDS200 Digital Demodulation System 070-9952-00
User Manual DDS200 Digital Demodulation System 070-9952-00
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<strong>Manual</strong> OperationFigure 2–57 shows the vectors used for calculating the modulation error:QActual statusError vectorIdeal center pointIFigure 2–57: Positions of vectors used for determining the modulation error(64QAM, first quadrant only)The peak and RMS modulation error can also be specified on a logarithmicscale. Conversion is done using the following formula: For quantized I/Q values, the peak value is output in discrete form only, since noaveraging is performed in the calculation. The RMS modulation error can becalculated within the limit values specified in Table 2–6, which lists the limitvalues obtained for quantized I/Q values.Table 2–6: Limit values for modulation errorOrder of QAM MER RMS,min MER PK,min MER PK,max MER dB,max40.5%1.563% 98.44% 46dBÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ16 ÁÁÁÁÁ0.5% ÁÁÁÁÁÁ46dBÁÁÁÁÁÁÁÁÁÁÁÁ1.398% ÁÁÁÁÁ43.32%ÁÁÁÁÁÁ32 ÁÁÁÁÁ0.7% ÁÁÁÁÁÁ1.976% ÁÁÁÁÁÁ29.33% ÁÁÁÁÁ43dBÁÁÁÁÁÁÁÁÁÁÁ64 ÁÁÁÁÁ0.5% ÁÁÁÁÁÁ46dBÁÁÁÁÁÁÁÁÁÁÁÁ1.364% ÁÁÁÁÁ20.46%ÁÁÁÁÁÁ128 ÁÁÁÁÁ0.7% ÁÁÁÁÁÁ1.952% ÁÁÁÁÁÁ13.66% ÁÁÁÁÁ43dBÁÁÁÁÁ256ÁÁÁÁÁÁ0.5%ÁÁÁÁÁÁ1.356%ÁÁÁÁÁ9.471% 46dBÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ<strong>DDS2<strong>00</strong></strong> <strong>Digital</strong> <strong>Demodulation</strong> <strong>System</strong> <strong>User</strong> <strong>Manual</strong> 2–75
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