Cable Channel Modeling Based on Chinese MSO s Network

Transcription

1 Cble Chnnel Modeling Bsed on Chinese MSO s Network Wu Gungsheng, Huwei Heshm ElBkoury, Huwei Xiolong Zhng, HUST Huzhong University o Science nd Technology HUAWEI TECHNOLOGIES CO., LTD.

2 Supporters Mr. Yo Yong, CRTA Xioping Hu, XFBN Dongqing Zhng, ZSCN HUAWEI TECHNOLOGIES CO., LTD. Pge 2

3 Objectives Develop multi-pth djcent mtri modeling method or EPOC cble chnnel modeling. Perorm lots o lb tests to veriy our modeling lgorithm bsed on Chinese MSO s network topologies nd components. Cooperte with Chinese MSOs nd Brodcom to test XFBN nd ZSCN s networks nd provide simultion results on micro-relection nd SNR estimtion to be used in their presenttions. HUAWEI TECHNOLOGIES CO., LTD. Pge 3

4 Common Cble Access Network Topologies nd Components HUAWEI TECHNOLOGIES CO., LTD. Pge 4

5 Cble Access Network Topology The PON+EOC topology deined in the EOC requirement whitepper o SARFT in 9. PON Coil cble network ONU ONU ODN CNU CPEs OLT ONU CNU CPEs ONU CLT Co up ler CNU RG/CPEs With PON s the opticl ccess technology, EOC technology minly cover the lst ew hundred meters cble network. The mimum subscribers coverge o ONU/CLT should be less thn households, nd will grdul reduce to 5 households or even households. Coil CATV signl distribution network users scenrio is usully or iber-to-the-residentil curb. Node+1, one mpliier behind the nlogue opticl receiver 5 users scenrio is or iber-to-the-building-unit MDU. Node+, without mpliier behind the opticl receiver. HUAWEI TECHNOLOGIES CO., LTD. Pge 5

6 Trunk/Drop Cble M loss prmeter C, db/m Cble type Frequency 5MHz 5MHz MHz 55MHz 8MHz MHz SYWV--5-I SYWV--5 RG SYWV--7-I SYWY--7-I SYWV--7 RG11 SYWY SYWV--9-I SYWY--9-I SYWV SYWY SYWLY--9-I SYWLY SYWLY--12-I SYWLY SYWLY--13-I SYWLY According to: GY/T Cble system physicl om polyethylene dielectric coil cble network conditions nd test methods HUAWEI TECHNOLOGIES CO., LTD. Pge 6

7 TAP/Splitter The splitter nd TAP speciictions deined by SARFT re consistent with SCTE stndrds. The TAP/splitter prmeters used in Chinese MSO network re similr with tht o NA network. --e.g. GY/T Cble system Splitters nd Tps 5-MHz network technicl conditions nd mesurement methods --e.g. ANSI/SCTE Drop Pssives: Splitters, Couplers nd Power Inserters Splitters in Chinese MSO network SP2 Splitter 2, SP3, SP4, SP8, SP, SP14, SP16, etc., With metric F emle connector, nd ohm mtch Tps in Chinese MSO network TAP81 one 8dB tp loss brnch, TAP/12/14/16/18/1 TAP82, TAP2, TAP12/14/16/18//222 TAP/12/14/16/18//223, TAP12/16//244, etc., There re splitters integrted with 5-65MHz upstrem dipleers tht re used or pssive bsebnd EOC. HUAWEI TECHNOLOGIES CO., LTD. Pge 7

8 Ampliiers There re mny kinds o CATV mpliiers in Chinese MSO s network. We selected one building mpliier in our modeling. The upstrem reverse pth o this kind o mpliier is bypssed with jumper nd usully used in HPAV EOC network. Items Downstrem Upstrem Spectrum rnge 54/87-86MHz 5-42/65MHz Stndrd Gin 24dB -4dB Stndrd output level 2dBuV - Mimum output level 1 dbuv - NF <8dB - CTB >63dB - CSO >63dB - Group dely <ns112.25mhz/116.68m - Hz Tilt control ~db djustble - HUAWEI TECHNOLOGIES CO., LTD. Pge 8

9 Component Prmeters Test/Modeling nd Network Modeling Algorithm HUAWEI TECHNOLOGIES CO., LTD. Pge 9

10 Coil Cble Test nd Modeling According SARFT stndrd, we tested nd modeled 3 types o coil cbles SYWV--5, SYWV--7, SYWV--9 Coil cble propgtion unction: αdb/m is the insertion loss o coil cble; it cn be epressed s ollow β is the phse constnt: Test/modeling Method1: Given the prmeters o ech type o cbles, we cn clculte the propgtion 1 2 k1 k 2l c 1 2 r r H e l e l j l chrcteristic o coil cbles. Method2: With the eperimentl mesuring nd curve itting, we cn obtin the prmeters. e HUAWEI TECHNOLOGIES CO., LTD. Pge

11 TAP/Splitter Test The min S mplitude-requency prmeters o TAP/Splitter re insertion loss/tp loss/input return loss/output return loss/tp return loss/tp-output isoltion/tp-tp isoltion, etc. The prmeters shows in below igure. in RLin IL RLout out in db db db out in out in TL2 ISOt3-o RLt2 out in db db db out in out in ISOo-t2 ISO21 ISO23 out in db db db out in out We cn test the S prmeters nd phse-requency prmeters o ll kinds o TAP/splitters with network nlyzer nd use these prmeters in our chnnel modeling. HUAWEI TECHNOLOGIES CO., LTD. Pge 11

12 Ampliier Test The mpliier is lso tested with Network Anlyzer We tested with Agilent network nlyzer E571C t,1 points Tested 5M-5MHz with.1mhz resolution S11/S21/S12/S22 prmeters nd phse prmeters, nd sved s *.s2p iles. We tested one building mpliier. Emples re shown in the igures below: S21 prmeter Group dely cn be converted rom phse prmeter HUAWEI TECHNOLOGIES CO., LTD. Pge 12

13 TAP/Splitter/AMP Modeling The Relection /Trnsmission- coeicient mtri A Bsed on the eperimentl mesurement,we cn get the trnsmission chrcteristic loss between ny two ports o the splitter/tp/amp,nd the relection chrcteristic t ech port, then consists the relection /trnsmission- coeicient mtri A. In this model, we del the Splitter/Tp/AMP s bo with some ports, we should know the chrcteristic o ny port. A N N 2 1N 2N : the loss o signl rom port i to port j. ji it is comple, the rel prt is converted rom S prmeter, nd its imginry prt is converted rom phse response NN 3 E.g :trnsmission coeicient 43:relection coeicient All coeicient consist o S prmeter rel prt nd phse response imginry prt HUAWEI TECHNOLOGIES CO., LTD. Pge 13

14 HUAWEI TECHNOLOGIES CO., LTD. Pge 14 Cble Network Modeling Algorithm -1 Multi-pth model Adjcent mtri lgorithm Relection /trnsmission- coeicient mtri A Coil cble loss mtri D Z 1 Z 2 l NN N N N N A N l l l e e e D 2 1

15 HUAWEI TECHNOLOGIES CO., LTD. Pge 15 Cble Network Modeling Algorithm -2 N N N l NN l N l N l N l l l N l l e e e e e e e e e D A P k i k k i k P H H 1 1 Unit loss mtri P Using the Adjcent mtri P, ll multi-pths rom trnsmitter to receiver cn be nlyzed. :ll the pths pssed k units. Trnser unction H dd multi- pth signls

16 Insertion Loss/Group Dely/Micro-Relection Simultion Results under Lb Environment HUAWEI TECHNOLOGIES CO., LTD. Pge 16

17 Scenrio1: Node+1 input 15-9 cble AMP cble -7 cble 3 16S 16S -5 cble test port2 48 test port3 test port1 Notes: mens ohm mtch ll lines between TAP/splitters re coil cble. SYWV--9/SYWV--7/SYWV--5. The number on the line mens the length o cble. e.g. 15 mens 15meters length We tested dt t ZSCN s lb. HUAWEI TECHNOLOGIES CO., LTD. Pge 17

18 LossdB Insertion Loss Test /Simultion Results Trnsmission loss site1- site2 Simultion results Insertion Loss vs Freqency port2 port1 port Frequency MHz Tested t ZSCN s Lb Insertion loss Vs requency HUAWEI TECHNOLOGIES CO., LTD. Pge 18

19 ns Group Dely Test/Simultion Results Group dely site1- site2 Simultion results 15 Group dely vs Freqency port2 port1 port3 5 Tested t ZSCN s Lb Frequency MHz Group dely Vs requency HUAWEI TECHNOLOGIES CO., LTD. Pge 19

20 db db db db Micro-relection Simultion Results Micro relections Fs=MHz 8M-MHz Micro relections Fs=MHz 1.G-1.2GHz relections 1 Time usec Fs=MHz 1.2G-1.4GHz Micro Time usec -6 Micro relections Fs=MHz 1.4G-1.6GHz Time usec Time usec HUAWEI TECHNOLOGIES CO., LTD. Pge

21 Scenrio2: Pssive Cble Network with Cscded TAP Distribution input SB8 LS48 LS48 LS412 LS412 LS416 LS416 LS4 LS4 test port cble 5 SB8-7 cble test port5 test port4 test port3 test port2 Notes: mens ohm mtch ll lines between TAP/splitters re coil cble. SYWV--7/SYWV--5. The number on the line mens the length o cble. e.g. 5 mens 5meters length HUAWEI TECHNOLOGIES CO., LTD. Pge 21

22 ns LossdB Simultion Results - Insertion Loss vs Freqency port1 Insertion loss Vs Frequency Group dely Vs Frequency Frequency MHz Group dely vs Freqency Frequency MHz port1 port2 port3 port4 port5 port2 port3 port4 port5 HUAWEI TECHNOLOGIES CO., LTD. Pge 22

23 db db db db Micro-relection Simultion Results Micro relections Fs=MHz 8M-MHZ Micro relections Fs=MHz 1.G-1..2GHz Micro relections Fs=MHz 1.2G-1.4GHz Time usec Micro relections Fs=MHz 1.4G-1.6GHz Time usec Time usec Time usec -6 HUAWEI TECHNOLOGIES CO., LTD. Pge 23

24 Noise/Intererence Test nd SNR Estimtion HUAWEI TECHNOLOGIES CO., LTD. Pge 24

25 Noise nd Intererence Test - Downstrem Loction: one user room site t XFBN Node+, Downstrem signls power o disconnect with opticl receiver Tested with Agilent N93A spectrum nlyzer. The min downstrem intererences t M~MHz re rom CMMB/Mobile The therml noise loor tested is bout -168dBm/Hz. HUAWEI TECHNOLOGIES CO., LTD. Pge 25

26 Noise nd Intererence Test - Upstrem Loction: one cble ccess point under the opticl receiver t XFBN. Node+, without upstrem signls. ll users power o. Tested with Agilent N93A spectrum nlyzer. The min intererences t 85M~MHz re lso rom Mobile signls. HUAWEI TECHNOLOGIES CO., LTD. Pge 26

27 EPOC DRFI prmeter ssumption For EPOC downstrem with 192MHz continuous spectrum bndwidth o RF port, it cn be equl to N= 32 combined 6MHz chnnels. Reer to Tble EQAM or CMTS Output Out-o-Bnd Noise nd Spurious Emissions Requirements N>=9 nd N'>=N/4 in DOCSIS3. DRFI spec., we clculte EPOC DRFI prmeter s below: Item Bnd 1 Adjcent chnnel up to khz rom chnnel block edge 2 Adjcent chnnel khz rom chnnel block edge to 6MHz rom chnnel block edge 3 Net-djcent chnnel 6 MHz rom chnnel N >4 >24MHz <-56dBc <-57dBc <-59dBc To coeist with DOCSIS legcy service, EPoC signl PSD cn not be higher thn the legcy service. We will use the DFRI prmeters in below tble or the ollowing SNR estimtion. block edge to 12MHz rom chnnel block edge 4 Third-djcent chnnel 12 MHz rom chnnel block edge to 18MHz rom chnnel block edge. <-6dBc Trnsmitter power over 192M bndwidth Converter to dbm/hz 6dBmV -71.6dBm/Hz 5 Noise in other chnnels 47MHz~2MHz in ech 6MHz bndwidth <-6dBc DRFI SNR 56dB Note: Where N is the Mimum Number o Combined Chnnels per RF Port, nd N is the Number o Active Chnnels Combined per RF Port. EPOC inbnd Noise loor Therml noise loor with 5dB receiver noise dBm/Hz -169dBm/hz HUAWEI TECHNOLOGIES CO., LTD. Pge 27

28 db Downstrem SNR Estimtion Under Node+ 6 M-1MHz Downstrem SNR estimtion port1 port2 55 port3 port4 port Frequency 8 HUAWEI TECHNOLOGIES CO., LTD. Pge 28

29 Summry Under Node+/+1 scenrios, the micro-relection is not signiicnt under 1.2GHz, but echo power grows seriously t 1.2G-1.6GHz Through SNR estimtion results, we think tht dptive modultion is very importnt or downstrem. We cn mke contribution on EPOC chnnel modeling. HUAWEI TECHNOLOGIES CO., LTD. Pge 29

30 THANK YOU HUAWEI TECHNOLOGIES CO., LTD. Pge 3