Smart Notching New concepts for EMC coordination

Transcription

1 Smart Notching New concepts for EMC coordination, Sony Deutschland GmbH, (EuTEC), Stuttgart, Germany, Prof. Dr. Holger Hirsch, Universität Duisburg-Essen, Energietransport und Speicherung, Duisburg, Germany, (1)

2 Outline Overview of today s EMI coordination Adaptive EMI mitigation techniques Satellite Communications Overlay OFDM Dynamic Notching for PLT Motivation of PLT Interference problems and solutions Implementation of a Prototype system ETSI PLT plugtest with EBU Results & EBU Statement Conclusions (2)

3 EMC-Coordination Coordination of emission and immunity requirements to guarantee the EMC of an electrical device real conditions ideal conditions variance due to manufacturing disturbances not considered level level immunity level immunity level immunity limit compatibility level compatibility level emission limit emission level Frequ emission level cum. probability EMC coordination: risk management! (3)

4 Adaptive EMI mitigation techniques are in use for lots of applications Satellite Communications Overlay OFDM Dynamic Notching for PLT (4)

5 Frequency Management for Mobile Satellites From: Rickerson, D.; Rhoads, Symphony or calliope-frequency management with mobile satellite services M.; Military Communications Conference, MILCOM '96, Conference Proceedings, IEEE Volume 3, Oct Page(s): vol.3 (5)

6 Overlay OFDM systems From: Rakesh Rajbanshi OFDM-Based Cognitive Radio for DSA Networks September 2007, University of Kansas (6)

7 Air Traffic Control From: B-VHF An Overlay system concept for future ATC communication in the VHF band M. Schnell, E. Haas; German Aerospace Center (DLR) M. Sajatovic, C. Rihacek, B. Haindl; Frequentis GmbH 23rd Digital Avionics System Conference (DASC); Oct , 2004; Salt Lake City, Utah, USA (7)

8 Air Traffic Control From: B-VHF An Overlay system concept for future ATC communication in the VHF band M. Schnell, E. Haas; German Aerospace Center (DLR) M. Sajatovic, C. Rihacek, B. Haindl; Frequentis GmbH 23rd Digital Avionics System Conference (DASC); Oct , 2004; Salt Lake City, Utah, USA (8)

9 Same Concept will be used for Powerline Communications (9)

10 Heterogeneous Home Network HDTV PDA Baby Monitor PC Audio System (10) A/V Home Server Wireless solution suffers from insufficient coverage PLT provides Broadband coverage in solid-wall households without new wires PLT as in-home backbone media, complementary to wireless High comfort/convenience factor for the user

11 PLT Interference problems SW Radio Broadcast <-> In-home Frequency range of PLT is identical to SW radio. Home Server DSL Router www Interference avoidance techniques, like Smart Notching remove interference to all receivable radio carriers amplitude in-home BPL spectrum SW Radio spectrum (11) frequency

12 PLT Interference problems SW Radio Broadcast <-> In-home Frequency range of PLT is identical to SW radio. Home Server DSL Router www Interference avoidance techniques, like Smart Notching remove interference to all receivable radio carriers amplitude in-home BPL spectrum SW Radio spectrum (12) frequency

13 PLT Interference problems SW Radio Broadcast <-> In-home Home Server Video recorded in a real building: AM reception PLT Sink DRM Reception Worst case of interference: amplitude in-home BPL spectrum PLT transmitter in vicinity of SW-receiver SW Radio spectrum (13) frequency

14 Video recorded in a real building: AM reception (Sony ICF-SW77) (14)

15 Screen shot of user interface of Sony PLT system (15)

16 ETSI PLT plugtest STF 332: PLT Modem (16)

17 Frequency hop of Skelton Radio transmission Skelton transmission toggled from 7225kHz to 7320kHz. There are 2 radios tuned to each frequency. In parallel there is PLT transmission inside the building from Sony s Smart Notching demonstrator: 1st Radio tunes to 7225kHz. This frequency is notched by PLT system. No interference! ps o t by s on o s s di s e a e t h h R tc star i ti c d n sw Hz 2 sw n z Hz 0k o H k 2 0 T tch z 5k 3 Strong PLT interference 2 L 2 7 H o 3 P k n 7 on 72 5 noticealbe at the 2nd radio m n a n o g o on 22 r o f n 7 n i (tuned to 7320kHz). n e r ti io lat s o i c s e e s n u s s i e ins d is u r m o e m e r s m rf ns n a e T t a Tr AM In Tr PL 0 (17) of f Time in sec

18 Test procedure A SW radio receiver did an automatic frequency scan in all ITU-R radio bands Sony ICF-SW77 was used (the most sensitive, we found) At all broadcast services where the automatic scan stops an SINPO assumption was done ITU-R Recommendation BS.1284: "General methods for the subjective assessment of sound quality PLT active, no notches PLT active, smart notching installed PLT off (18)

19 Field tests: SINPO assumption 168 times SINPO assumption performed DRM Quality of the Not useable radio service: (19) News talker could be understood Music might be enjoyed Good AM quality FM quality (DRM only can provide this in SWfrequencies)

20 European Broadcasting Union Union Européenne de Radio-Télévision Technical Department Département technique 9 January 2008 EBU S/EIC1 Statement with regard to ETSI specification of PLT "Smart Notching" system The latest version of the Coexistence Specification (ETSI TS v ; PowerLine Telecommunications (PLT) Coexistence between PLT Modems and Short Wave Radio Broadcasting) services was considered by the EBU S/EIC group at its meeting on the 28th and 29th November Within the provisions: the document concerns itself specifically with a system of dynamic notching (referred to as Smart Notching ) whereby a PLT modem omits, or notches certain frequencies and frequency ranges from the signal which it uses to communicate with other PLT modems. Other aspects of PLT systems and system design outside the scope of the specification are excluded; - the protection (dynamic notching) system is designed only to protect HF broadcast transmissions services in specified bands between 2 MHz and 30 MHz; - the EBU S/EIC group is content that any system fully meeting the specification will offer adequate protection to HF (Short Wave) broadcast transmissions. The EBU S/EIC group will therefore recommend to EBU members that are also members of ETSI that they should support the adoption of the specification within ETSI. Further to this a representative of the EBU, Mike Hate, was present during the tests described in document ETSI TR 1XX W124 v2.1.x (PLT44_TD_12r1_ETSI_TR_WI24_Part2_V2_0_3.doc. The EBU S/EIC group confirms that this document is a fair and accurate report of the tests carried out and the results obtained. (20)

21 Conclusions There is a wide range of Applications allocating frequency spectrum dynamically. Online analysis allows an adaptation of the system on the current local situation. EMI is not guaranteed at manufacturing of the device but due the concept of operation. For PLT ETSI specified a TS including verification mechanism Protection of existing radio applications is guaranteed Adaptive Mitigation techniques are state of the art in today s standards & norms: EN : Signaling on low-voltage electrical installations in the frequency range 3 khz to 148,5 khz 4 Frequency bands and classifications NOTE: Additional provisions may apply in the event of interference to radio communication service. (21)