Integrated Circuit Systems Sarnoff Corporation December 1999

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Integrated Circuit Systems Sarnoff Corporation December 1999

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PRELIMINARY WASHINGTON FIELD TEST RESULTS MCT2100 8-VSB RECEIVER
Integrated Circuit Systems Sarnoff Corporation
December 1999
SUMMARY
This preliminary result Washington field-test trials MCT2100 8VSB receiver. tests took place November 29th 30th 1999. total outdoor indoor sites were tested. outdoor tests were done using MSTV truck with feet extendable mast antenna. truck, signal comes from antenna goes through amplifier noise generator (which used during these tests). performance MCT2100 observed recorded using segment error rate signalto-noise ratio measures. test procedure starts with raising truck's antenna height (possible) roof antenna height test site mostly point transmitters some cases some angle. angle receivability were optimized best spectrum. every site, possible receive 8-VSB signal break reception changing location antenna moving truck) and/or rotating antenna. mast antenna used mostly outdoor measurements. Antiference Radioshack bowtie antennas used during indoor testing Keybridge Marriot Hotel, Arlington Some results indicate that channel gets sometimes only also combination following disturbances: Multipath (leading, strong quasi-static and/or strong dynamic) Adjacent channel interference Impulse noise
performance criteria 8-VSB reception following: Segment Errors: Zero segment errors happen during test interval Segment Errors: Some segment errors happen during test interval (below above level) Sync: system does acquire pilot and/or field sync during test interval.
subjective performance criteria NTSC reception following rating reception degradation: Imperceptible Perceptible annoying Slightly annoying Annoying Very Annoying quality NTSC average decision rating consultant's rating.
Stations broadcasting Washington were: WETA-DT (very power) WUSA-DT WTTG-DT WJLA-DT WRC-DT
Power levels were noted, although none were running full licensed power levels WETA very power, evidenced measured signal levels.
Test Results
SITE-1: Oronocco Park (between Pendleton Union St.) DISTANCE TRANSMITTER: 9.26MILES degrees LOCATION: (N38d48m36.6s, W077d02m24.2s) TIME: 11:00AM WEATHER CONDITION: SUNNY WIND CONDITION: NONE ANTENNA DIRECTION HEIGHT: Pointing transmitter 15ft high NOTES: Nearby lake surrounding trees story buildings. wide building between lake highway with flat metal window surface. Strong leading echoes were observed Channels NTSC reception Grade cases were tested. first, reception channels segment errors. second case, truck backed about 5-feet. leading echoes disappeared. channels were receivable. There some slow varying dynamic multipath Channel. other channels were almost flat receivable without segment errors. NTSC reception quality Grade 2-2.5.
SITE-2: Arlington (between Nash Street 14th Street) DISTANCE TRANSMITTER: 3.5MILES degree LOCATION: (N38d53m24.6s, W077d04m20.1s) TIME: 1:00PM WEATHER CONDITION: SUNNY WIND CONDITION: WINDY (Gusting 5mph) ANTENNA DIRECTION HEIGHT: Pointing transmitter 25ft high NOTES: Static multipath with 5-15dB notches. Dynamic multipath observed because wind. Channels received with errors. Antiference antenna tried same location. possible reception properly pointing antenna towards transmitter. NTSC reception Grade 2,3.
SITE-3: US50 DISTANCE TRANSMITTER: 5.45MILES degrees LOCATION: (N38d52m01.0s, W077d07m12.1s) TIME: 3:45PM WEATHER CONDITION: PARTIALLY CLOUDY WIND CONDITION: WINDY (Gusting 5mph) ANTENNA DIRECTION HEIGHT: Pointing transmitter 15ft high NOTES: line sight transmitter, in-between hills. Using truck antenna, mostly moderate- low-amplitude quasi-static echoes. NTSC audio carrier from Channel adjacent Channel audio carrier particularly strong this location. Channel some dynamic multipath. There beat pilot 10dB notches spectrum. Reception with errors multipath Channel especially bad. deep notches (14dB 18dB) swept spectrum segment errors were observed. NTSC reception quality 3-3.5
SITE-4: Elliot Avenue DISTANCE TRANSMITTER: 4.91MILES degrees LOCATION: TIME: 17:00PM WEATHER CONDITION: PARTIALLY CLOUDY WIND CONDITION: WINDY (gusting 5-10mph) ANTENNA DIRECTION HEIGHT: Pointing transmitter high NOTES: delay spread about there long echo 36-37us with 12-14dB down from main path. equalizer coefficients were captured further analysis. Fast dynamic multipath observed Channel with deep notches with flat fading upto 15dB. Sync achieved. Channel dynamic multipath with notches 15dB channel. Same phenomenon also valid Channel Both segment errors.
Channel both dynamic multipath flat fading which sometimes caused 20dB spectral tilts well 15dB notches. Channel received with segment errors. Long ghosts effected NTSC well. quality reception NTSC 2.5.
SITE-5: Bridge Marriot Hotel (Indoor) DISTANCE TRANSMITTER: 3MILES LOCATION: TIME: 20:00PM WEATHER CONDITION: WIND CONDITION: ANTENNA DIRECTION HEIGHT: Pointing degrees with respect transmitter floor NOTES: room facing opposite direction with respect transmitters. Radioshack bowtie antenna used during these tests. possible place antenna location receive individual channels. location chosen front window measurements were made channels without changing location antenna. Channel multipath characteristics even though receivable slightly rotating antenna different angle. other channels quasi-static multipath characteristics they were receivable with errors except Channel NTSC audio carrier from Channel wasn't attenuated sufficiently which main problem.
SITE-6: Shirlington Circle (Wakefield 29th St.) DISTANCE TRANSMITTER: 6.77MILES degrees LOCATION: N38d50m31.5s, W077d05m47.6s TIME: 11:00PM WEATHER CONDITION: SUNNY WIND CONDITION: WINDY (gusting 10mph) ANTENNA DIRECTION HEIGHT: Pointing transmitter 20ft high NOTES: Typical residential area with story townhouses surrounded trees.
locations were tested same site. First have multipath moved truck feet. second location closer trees than first dynamic multipath conditions were stronger.
results second location. Channel received, channel received with segment errors. Channels segment errors were below TOV. Channels were also tested using bowtie antenna were received with segment errors.
channels except receivable from 20ft mast antenna. NTSC reception quality Grade 2.5-3.
SITE-7: George Mason University Building DISTANCE TRANSMITTER: 14.8MILES degrees LOCATION: N38d49m50.2s, W077d19m05.8s TIME: 14:30PM WEATHER CONDITION: SLIGHTLY CLOUDY WIND CONDITION: WINDY (gusting 10mph) ANTENNA DIRECTION HEIGHT: Pointing transmitter 20ft high NOTES: site behind hill valley surrounded trees. Typical residential area with story houses. Channels moderate severe dynamic multipath with 10-15dB flat fading sweeping notches (1-2Hz). They both segment errors. Channels were easy receive with flat spectrum. reception also possible with bowtie antiference antennas. Couldn't stay locked channels using indoor antennas. NTSC reception quality 2.5-3
SITE-8: George Mason University Mall DISTANCE TRANSMITTER: 14.8MILES degrees LOCATION: N38d49m34.9s, W077d18m54.9s TIME: 16:00PM WEATHER CONDITION: CLOUDY WIND CONDITION: WINDY (gusting mph) ANTENNA DIRECTION HEIGHT: Pointing transmitter 15ft high
NOTES: Open mall parking surrounded with trees highway front where antenna pointed towards transmitters. Channels didn't have multipath reception very easy these channels. Channel some dynamic multipath with 10dB beat pilot notches upto 15dB sweeping spectrum below TOV.
SITE-9: Springfield (644 Wyngate) DISTANCE TRANSMITTER: 14.2MILES degrees LOCATION: N38d46m37.8s, W077d14m33.6s TIME: 17:00PM WEATHER CONDITION: CLOUDY WIND CONDITION: WINDY (gusting 5mph) ANTENNA DIRECTION HEIGHT: Rotated antenna degrees with respect transmitter 15ft high NOTES: test site street which next busy highway power lines. main problem this location impulse noise which observed during tests even though these channels. speculated that leaky insulators power lines were possible causing impulse noise multipath conditions were relatively dynamic. Channels relatively more multipath compared Channel Without rotation antenna spectrum looked reasonably flat Channels stations segment errors.
SITE-10: Mount Vernon Rest Area (George Washington Parkway North) DISTANCE TRANSMITTER: 12.5MILES degrees LOCATION: N38d45m34.5s, W077d02m56.7s TIME: 19:00PM WEATHER CONDITION: CLOUDY WIND CONDITION: WINDY (gusting 5mph) ANTENNA DIRECTION HEIGHT: Rotated antenna degrees with respect transmitter high
NOTES: This site nearby busy highway Potomac River. elevated terrain surrounded trees. reception possible Channel because [their own] adjacent NTSC channel's audio carrier leaking into receiver's with levels more than stronger than 8-VSB signal. Channel 5-7dB flat fading notches deep 6-8dB received with segment errors. Towards testing Channel came became adjacent channel Channel moderate dynamic multipath plus adjacent channel interference leaking through filter. dynamic multipath caused notches much 15dB Channel there were segment errors. Channel flat spectrum which easily receivable even though transmitter miles away. [Channel operated Sinclair Baltimore] adjacent channel interference from Channel problem this case.

Integrated Circuit Systems Sarnoff Corporation December 1999

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