700 MHz band LTE and Digital/Analog TV mutual interference.
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1 700 MHz band LTE and Digital/Analog TV mutual interference. Authors: Eng. Ernesto Fontes Pupo. 2018
2 The Future Belongs to those who prepare for it today. - Malcolm X
3 Outline Introduction Analog - Digital TV & 700 MHz band LTE Research Problem. Interference scenarios. Types of Interference. Methods of interference evaluation. Conclusions.
4 RESEARCH & DEVELOPMENT TELECOMMUNICATIONS INSTITUTE 6MHz Digital TV Introduction 798 MHz UHF Analog TV LTE up-link GAP down-link 806 MHz 5MHz 45 MHz 10 MHz 45 MHz 3MHz
5 Research Problem To identify the conditions that make possible the coexistence between 700 MHz LTE and TV systems, eventual critical situations and possible mitigation techniques
6 Interference scenarios 700 MHz LTE up-link TV down-link COAXIAL CABLE
7 Interference scenarios 700 MHz LTE TV COAXIAL CABLE
8 Interference scenarios TV Tx 700 MHz LTE Down-Link Tx TV Rx TV Down-Link Rx COAXIAL CABLE Co-Channel Adjacent Channel
9 Co-Channel Interference TV/LTE Rx (P1 dbm) Ch1 noise floor LTE/TV Tx (P2 dbm)
10 Co-Channel Interference Protection Ratio (Pr) TV/LTE Rx (P1 dbm) noise floor LTE/TV Tx (P2 dbm) if P1 P2 Pr Rx Threshold (Th)
11 Adjacent Channel Interference Rx (P1 dbm) Ch1 Ch2 Tx (P2 dbm) noise floor Tx ACLR: Adjacent Channel Leakage Ratio Unwanted Emissions
12 Adjacent Channel Interference Rx (P1 dbm) Ch1 Ch2 Tx (P2 dbm) noise floor Rx ACS: Adjacent Channel Selectivity Unwanted Emissions
13 Adjacent Channel Interference Pr Rx (P1 dbm) Tx (P2 dbm) noise floor if P1 P2 Pr Rx Th Unwanted Emissions
14 How to find the Protection ratios (Pr) that make the coexistence between 700 MHz LTE and the Cuban TV systems possible?
15 For Tx RESEARCH & DEVELOPMENT TELECOMMUNICATIONS INSTITUTE What do we need to measure? LTE Base Station down-link LTE User equipments up-link TV Tx For Rx LTE Base Station up-link LTE User equipments down-link TV STB/iDTV ACLR ACS Rx Th Pr
16 How to measure the Rx Threshold of the different systems? For Digital TV Threshold of visibility (TOV)/ Subjective Failure Point (SFP). For Analog TV For 700 MHz LTE Subjective comparison method with a sinusoidal interfering source. Data Block Error Rate (BLER). Error Vector Magnitude (EVM).
17 Methods of interference evaluation Simulation Tests Laboratory Tests Field Tests LTE Radio Communication Tester. 700 MHz LTE Base Station & User equipment ETECSA
18 If you can t fly then run, If you can t run then walk, If you can t walk then crawl, But whatever you do, You have to keep moving forward. - Martin Luther King Jr.
19 Thank You!
20
21 Data Block Error Rate (BLER) There is definition for service quality index as "data block error rate value is not larger than 10%" in A Therefore, "the block error rate (BLER) of the LTE measured terminal is larger than or equal to 10%" is used as the failure point criterion in this test for FDD-LTE.
22 El método utilizado para evaluar el criterio de punto de fallo de LTE es la medición del BLER (Data Block Error Rate). Este método se aplica siguiendo el reporte de la UIT-R BT de 2018, donde se especifica que su valor no debe ser mayor del 10%. Para monitorear el desempeño de LTE a nivel de la capa física se utiliza el Error Vector Magnitude (EVM). Cada modulación utilizada en LTE debe cumplir los limites EVM definidos, los cuales son 17.5%, 12.5%, 8.0% para QPSK, 16-QAM y 64-QAM respectivamente. Como se analiza en [3-6], cuando estos límites EVM son excedidos la señal LTE recibida no tiene una calidad aceptable.
23 Error Vector Magnitude (EVM)
24 Error Vector Magnitude (EVM) EVM (in %) is a recognized parameter to evaluate performance of an LTE signal on PHY level. Each modulation, used in the LTE system, must fulfill a defined EVM limit. These limits are 17.5%, 12.5%, 8.0% for QPSK, 16QAM and 64QAM, respectively. When these EVM limits are exceeded, then the received LTE signal has not an acceptable quality [6], [18]. Modulation scheme for PDSCH Required EVM [%] QPSK 18.5 % 16QAM 13.5 % 64QAM 9 % 256QAM 4.5%
25 LTE - TVD Fuente de Audio/Video Codificador Digital Modulador DTMB Atenuador Variable idtv Terminal de Usuario Combinador (4) Divisor de RF (1x2) Generado r LTE Atenuador Variable Analizador de Espectro
26 LTE - TVD Fuente de Audio/Video Codificador Digital BTC Modulador DTMB Atenuador Variable idtv Terminal de Usuario Combinador (4) Divisor de RF (1x2) Generador LTE Atenuador Variable Analizador de Espectro DVW500
27 LTE - TVA Fuente de Audio/Video Modulador NTSC-M Atenuador Variable NTSC-M TV Terminal de Usuario Combinador (4) Divisor de RF (1x2) Generador LTE Atenuador Variable Analizador de Espectro
28 RESEARCH & DEVELOPMENT LTE TELECOMMUNICATIONS - TVA INSTITUTE Fuente de Audio/Video Modulador NTSC-M Syes Atenuador Variable NTSC-M TV Terminal de Usuario Combinador (4) Divisor de RF (1x2) Generador LTE Atenuador Variable Analizador de Espectro DVW500
29 Types of Interference LTE-Tx Up-link TV-Rx STB/iDTV TV-Tx LTE-Rx Up-link
30 Types of Interference LTE TV TV LTE Rx Overload Threshold (Oth) Unwanted Emissions
31 TV RESEARCH & DEVELOPMENT TELECOMMUNICATIONS INSTITUTE Interference scenarios
32 TV RESEARCH & DEVELOPMENT TELECOMMUNICATIONS INSTITUTE Interference scenarios
33 Interference scenarios TV COAXIAL CABLE
34 Interference scenarios TV COAXIAL CABLE
35
36
37
38 Introducción
39 Introducción
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