MCT2100

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Laboratory Test Report MCT2100 Evaluation System
Motorola Operation Chandler, November 1999
Executive Summary
second generation receiver/evaluation system MCT2100 underwent first laboratory performance testing during week November 1999. laboratory testing conducted Sarnoff corporation Motorola Sarnoff engineers. evaluation system demonstrated significantly improved performance over first system that tested August-September 1999. programmability MCT2100 allowed optimization multipath performance strong echoes pre-echo postecho delay range dynamic phase rotation frequencies from "quasi-static" (0.05 Doppler shifts. indoor reception field tests, this range echo delays dynamic frequencies which have most frequently encountered strong echoes. MCT2100 engineering team chose optimize strongest echo performance this parameter space order achieve best overall performance indoor reception field tests. Over this range echo delays Doppler frequencies, Threshold Visibility (TOV) error rate requirement echo amplitudes between depending upon particular echo delay dynamic frequency. Longer echo delays higher Doppler frequencies demonstrated reduction maximum tolerable echo amplitude, 12.1 14.9 with postecho delays Echo delays longer than Doppler frequencies higher than have been tested lab. Signal-to-noise ratio (SNR) degradation equalization multipath also tested Grand Alliance echo ensembles A-G. degradation varied from Doppler frequencies increasing Comparison tests based measuring post-equalizer tests that measured error rate compliance revealed that adaptive equalizer converge provide sufficient under more extreme multipath conditions than those reported here, error rate criterion under those conditions. This suggests that certain dynamic multipath channels, adaptive equalizer limiting factor determining overall demodulator performance summary, these results demonstrate that MCT2100 supports robust reception strong echoes short post-echo delays Doppler shifts most commonly encountered indoor reception environments. long echo delays and/or higher Doppler frequencies, maximum tolerable echo amplitude reduced, with relatively weak echo tolerance Doppler frequencies least
MCT2100 Evaluation System Description
MCT2100 Evaluation System consists four interconnected circuit boards mounted connectorized steel chassis. Tuner Board receives input from antenna performs channel tuning fixed gain amplification 43.75 output. This Tuner Board also receives differential control voltage from MCT2100 accepts power from Power Distribution Board. gain control characteristic adjusted optimum "delayed AGC" response between AGC. On-board voltage regulators provide local power Tuner Board circuits. evaluation systems currently test Alps dual conversion `DTV' tuner. modular three-board approach, however, allows variety NTSC tuners tested Evaluation System customizing only Tuner Board. With Alps tuner, dynamic range achieved with average noise figure approximately dynamic range. complete receiver using this Tuner Board dynamic range from dBm, measured tuner input. Board receives output from Tuner Board provides fixed variable gain total dynamic range with output voltage capable driving converter optimum signal level. This board also receives differential control voltage from MCT2100 performs 1-bit function lowpass filtering this sigma-delta modulated control signal. Board includes filter with layout option include second filter loss compensation amplifier. These filters have bandwidth MHz, centered frequency provide majority receiver selectivity. Board also includes band-reject filter centered MHz, which attenuates triple-transit responses filters. board receives power from Power Distribution Board on-board voltage regulators local power. Demodulator Board receives level-controlled output from Board, performs 10-bit conversion delivers digital samples MCT2100 demodulation. Demodulator Board outputs MPEG-2 transport stream either bit-serial byte-parallel fashion. board provides differential control signal also "TOV" error count output that intended error rate performance measurement. This 16-bit count number uncorrectible MPEG-2 packets, which gives indication Data Segment error rate. Demodulator Board receives Power from Power Distribution Board on-board voltage regulators local power. Power Distribution Board receives input power from AC/DC switching power supply located outside Evaluation System chassis. This board provides power supply filtering distrubution contains active devices. Evalution System chassis contains type-F female connector antenna input, DB-25 connector interfacing parallel port laptop dual-row 40-pin male header, connecting MPEG-2 transport stream MPEG-2 decoder box. Windows laptop with parallel port required communicating with MCT2100 Evaluation System. MCTOOL software performs control, monitoring measurement functions associated with Evaluation System.
Laboratory Test Setup Test Methodology
laboratory setup consisted Sarnoff-built 8-VSB modulator, Dynamic Ghost Simulator, Noise Test Set, upconverter, Spectrum Analyzer, MCT2100 Evaluation System laptop running MCTOOL software under Windows During these tests, primary boards Evaluation System were exposed bench, having been integrated into steel chassis. Great care taken ensure that interference from external ingress factor testing. pass/fail crieterion conservative Threshold Visibility (TOV) measurement. ATSC defines average Error Rate (BER) 3x10-6 Segment Error Rate (SER) segment errors second. Previous tests have revealed that truly defines requirement, random BER, because errors occur bursts uncorrectible MPEG-2 packets. focus therefore measuring only. measurement interval seconds each test. Error Rate Tester (BERT) available these test, "TOV" MPEG-2 packet error counter Evaluation System used. number packet errors counted seconds. burst packet errors occurred more than once every seconds, result declared "marginal". result declared "pass" only more than bursts packet errors occurred during second interval. accuracy packet error count, displayed MCTOOL software, verified with Tektronix Logic Analyzer, which counted number MPEG2 packets which MERR signal asserted MCT2100. formal data collection, this 'segment error' count monitored software display
III.
Laboratory Test Results
Formal data collected using multipath test suite that superset Grand Alliance multipath tests. those tests which required adding Gaussian noise prior receiver, "excess SNR" measurements were taken from (mean-square error) value reported MCT2100.
Single Dynamic Ghost Tests
Frequency (Hz) Delay (µs) -1.000 -0.200 0.100 0.200 0.300 1.000 15.000 0.050 5.000 3.000 1.000 2.100 0.800 0.400 5.000 0.500 1.000 2.000 5.000 Echo Attenuation (dBc) 10.000 20.000 40.000 10.800 8.500 12.500 13.600 12.600 14.900 13.300
1.100 2.100 0.800 0.400 5.300
1.700 2.100 0.800 0.500 5.300
2.300 3.500 1.300 0.700 5.200
3.400 5.500 3.900 6.400 6.300
4.400 7.500 6.700 9.600 8.700
6.300 11.300 9.700 12.100 10.900
Echo Attenuation (dBc)
14-16 12-14 10-12 8-10
-0.2 0.05
Frequency (Hz)
Delay (µs)
Grand Alliance Ensemble Tests
Frequency (Hz) +1.8 echo Ensemble
0.000 0.050 0.500 Excess Required (dB) Over AWGN Channel 1.500 2.800 2.900 0.700 2.100 2.800 0.800 0.300 0.400
5.000 5.200
Conclusions
laboratory test results indicate outstanding strong echo tolerance short echo delays frequency dynamics. With optimized pilot tracking loop settings, MCT2100 able track deep pilot attenuation, type observed quasi-static (0.05 multipath test. laboratory tests also indicate that equalizer tolerate stronger echoes with long delays higher speed dynamics than error criteria support, indicating that some dynamic multipath channels, equalizer limiting factor system.

MCT2100

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