Soontai LTE Filter 2011.03.30 v1.0

Contents What is LTE ? How does LTE interfere with DTT ? How to filter out LTE interference ? Soontai LTE filter

What is LTE ? LTE (Long Term Evolution) is a 4th generation (4G) standard for mobile communication. Currently 17 communication companies worldwide have adopted LTE, more than 100 more are about to follow. LTE uses - FDD (Frequency Division Duplexing) and - TDD (Time Division Duplexing) protocols FDD : LTE base stations and handheld devices use different bands TDD : LTE base stations and handheld devices use the same bands

USA MetroPCS : - 2010.09.21 - FDD 1.4/1.7GHz Verizon : - 2010.12.05 - FDD 700MHz Germany Vodafone : - 2010.12.01 - FDD 800MHz Japan NTT DoCoMo : - 2010.12.24 - FDD 1.5GHz Uzbekistan MTS / UCell: - 2010.07.28 - 2010.08.09 - TDD 2.6GHz Norway TeliaSonera: - 2009.12.15 Finland - 2010.11.30 Denmark - 2010.12.09 Estonia EMT: - 2010.12.17 Sweden Poland Mobyland, CenterNet - 2010.09.07 Austria A1 Telekom - 2010.11.05 Canada 700MHz/2.6GHz 2010 auction Brazil 2.6GHz 2013 auction

FDD LTE 800MHz Spectrum Digital TV Frequency LTE Downlink Band LTE Uplink Band

LTE-800 Transmission Interferance into DTT How does LTE interfere with DTT ? LTE Base Station LTE-800 Transmission Interferance into DTT 當DVB-T的信號在最低準位-72dBm(35dBuV)時, LTE的信號如果高於DVB-T信號27dB時, 則DVB-T信號就會被干擾, 所以如果直接以基地台的最高發射功率167dBuV計算時那麼要衰減105dB才能免除對DVB-T的干擾, 或是相距5公里

LTE User Equipment 再來是當手機或其它LTE裝置發射時, 當DVB-T信號在最低準位-72dBm(35dBuV)時, 其發射信號強度不可高於31dBc, 所以以實際LTE裝置的25dBm(132dBuV)發射功率計算, 則必需衰減66dB

LTE Interference to DTT When LTE uses the 800 MHz “digital dividend” (Europe 790-864MHz) or the 700 MHz “white space” band (USA 698-806MHz) there will be interference with digital video broadcast signals (DVB-T/ATSC). DTV picture noise: How to solve this problem?

LTE Interferes with DTT Soontai LTE Filter LTE Interferes with DTT LTE signal DVB-T signal TV Antenna LTE Base Station DVB-T signal LTE signal Soontai LTE Filter DVB-T set-top box LTE User Equipememt DVB-T signal LTE signal

Soontai LTE Filter LTE is the 4th generation mobile communication standard. This standard uses the frequency band next to the DVB-T band (790 - 862MHz in Europe, 698 - 806MHz in the Americas), which will lead to interferences with DVB TV or set-top-boxes. According to tests from Ofcom this interference can be eliminated with the help of a high rejection low pass filter. Our LTE Filters pass all requirements to eliminate interferences by LTE signals on digital broadcast reception. As a professional filter designer, Soontai can offer the LTE filter in a variety of packages and frequencies for various markets. Your inquiries are welcome. For more information please contact Mr. Kevin Chang E-mail : kevin.chang@soontai.com www.soontai.com

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