ETSI TR 101 562-1 V1.2.1 (2011-08)

PowerLine Telecommunications (PLT); MIMO PLT; Part 1: Universal Coupler, Operating Instructions - Description

RTR/PLT-00034

General Information

• Status: Published
• Publication Date: 25-Aug-2011
• Technical Committee: PLT - Powerline Telecommunications
• Current Stage: 12 - Completion
• Due Date: 07-Sep-2011
• Completion Date: 26-Aug-2011

Standards Content (Sample)

Technical Report
PowerLine Telecommunications (PLT);
MIMO PLT;
Part 1: Universal Coupler,
Operating Instructions - Description

2 ETSI TR 101 562-1 V1.2.1 (2011-08)

Reference
RTR/PLT-00034
Keywords
coupling, MIMO, powerline
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ETSI
3 ETSI TR 101 562-1 V1.2.1 (2011-08)
Contents
Intellectual Property Rights . 4
Foreword . 4
Introduction . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Symbols and abbreviations . 6
3.1 Symbols . 6
3.2 Abbreviations . 6
4 Major Project Phases . 7
5 Motivation . 7
6 MIMO PLT Universal Coupler . 8
7 Safety note . 9
8 Objectives of the MIMO PLT (STF 410) design . 9
9 Technical Data of Couplers . 10
9.1 Impedance conditions . 10
9.2 Insertion Loss . 11
10 Operation . 11
10.1 SISO transmit and SISO receive (example P-N to P-N) . 11
10.2 MIMO symmetric transmit (example N-E), MIMO receive star plus CM . 12
10.3 MIMO asymmetric transmit (example N-E), MIMO receive star plus CM . 12
10.4 SISO common mode transmit and SISO common mode receive . 13
10.5 Alternative MIMO mode using dual wire feed. 14
11 Circuit diagram . 16
12 Measurement Results . 18
12.1 SISO . 18
12.2 MIMO symmetric . 19
12.3 MIMO Delta transmit to star receive . 20
12.4 Common mode Reception . 22
12.5 Alternative MIMO modes (dual wire feed) . 23
Annex A: Bibliography . 24
History . 25

ETSI
4 ETSI TR 101 562-1 V1.2.1 (2011-08)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://ipr.etsi.org).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Report (TR) has been produced by ETSI Technical Committee Powerline Telecommunications (PLT).
The present document is part 1 of a multi-part deliverable covering the MIMO PLT as identified below:
Part 1: "Universal Coupler, Operating Instructions - Description";
Part 2: "Measurement Methods and Statistical Results of MIMO PLT EMI";
Part 3: "Measurement Methods and Statistical Results of MIMO PLT channels".
Introduction
In order to study and compare MIMO (Multiple Input Multiple Output) characteristics of the LVDN network in
different countries the STF 410 (Special Task Force) was set up. The present document is one of three TRs which
present the result of the work of STF 410. The work items in ETSI TC PLT dealing with the results of STF 410 are the
present document, TR 101 562-2 [i.6] and TR 101 562-3 [i.7].
The present document specified the measurement tools, set-up and procedure to record parameters like MIMO channel
transfer functions, impedances and noise. Statistical evaluations of the recoded data is given in clause 8.
A second document produced by STF 410 deals with the EMI of MIMO PLC. The third document presents the
schematics and properties of the MIMO PLC couplers used for feeding and receiving signals into the mains grid. These
couplers are used for the channel as well the EMI measurements.
ETSI
5 ETSI TR 101 562-1 V1.2.1 (2011-08)
1 Scope
The present document covers MIMO PLT channel transfer measurements and statistical analysis taking into account
such matters as earthing variation, country variation, operator differences, phasing and distribution topologies,
domestic, industrial and housing types along with local network loading. The present document is a description of the
MIMO PLT couplers used for feeding and receiving signals to and from the mains grid.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
Not applicable.
2.2 Informative references
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] Terms of Reference for Specialist Task Force STF 410 (TC PLT) on "Measurements to Verify
Feasibility of MIMO PLT", Version: 1.1, 6 May 2010.
[i.2] Sartenaer, T. & Delogne, P., "Powerline Cables Modelling for Broadband Communications",
ISPLC 2001, pp. 331-337.
[i.3] R. Hashmat (1), P. Pagani (1), T. Chonavel (2), ( 1: Orange Labs, France), (2: Telecom Bretagne,
France), "MIMO Capacity of Inhome PLC Links up to 100 MHz", Workshop on PLC 2009 -
Udine - Italy.
[i.4] A. Schwager, "Powerline Communications: Significant Technologies to become Ready for
Integration" Doctoral Thesis at University of Duisburg-Essen, May 2010.
[i.5] ETSI TR 102 175 (V1.1.1): "PowerLine Telecommunications (PLT); Channel characterization and
measurement methods".
[i.6] ETSI TR 101 562-2: "PowerLine Telecommunications (PLT); MIMO PLT; Part 2: Measurement
Methods and Statistical Results of MIMO PLT EMI".
[i.7] ETSI TR 101 562-3: "Powerline Telecommunications (PLT); MIMO PLT; Part 3: Measurement
Methods and Statistical Results of MIMO PLT channels".
ETSI
6 ETSI TR 101 562-1 V1.2.1 (2011-08)
3 Symbols and abbreviations
3.1 Symbols
For the purposes of the present document, the following symbols apply:
dB decibel (logarithmic unit)
dBm 10 * log (P / 1 mW)
Hz Hertz
L Inductance
m meter
MHz Mega Hz
nF nanoFarads
nH nanoHenry
Ω Ohm
Z Impedance
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AC Alternating Current
BNC Bayonet Nut Connector
C "Center point" of the coupler
CM Common Mode
DM Differential Mode
E protective Earth
EP connection E to P
LVDN Low Voltage Distribution Network
MIMO Multiple Input Multiple Output
N Neutral
NE connection N to E
P Phase
PE Protective Earth
PLC PowerLine Communication
PLT PowerLine Telecommunications
PN connection P to N
RCD Residual Current Devices
Rx Receive
S Switch
SISO Single Input Single Output
STF Special Task Force
sym symmetrical
t Turns
TR Technical Report
TTL Tranverse Transfer Loss
Tx Transmit
ETSI
7 ETSI TR 101 562-1 V1.2.1 (2011-08)
4 Major Project Phases
Table 1
No. Period Topic Event
01 Sept. 2010 Project organization STF 410 preparatory meeting
Definition of targets, what and how to Stuttgart, Germany
measure
02 Oct to Nov 2010 Specification of the measurements
03 Dec. 2010 to Feb. Implementation of the STF 410 MIMO PLT
2011 couplers
04 March 2011 Setup of measurement equipment at the
site of each expert
05 April to May 2011 Conducting field measurements in various
European countries
06 June to July 2011 Statistical evaluation of the data and
drafting of the TRs
5 Motivation
PLT systems available today use only one transmission path between two outlets. It is the differential mode channel
between the phase (or live) and neutral contact of the mains. Such systems are called SISO (Single Input Single Output)
modems. MIMO PLT systems do not use only one transmission path. The utilization of the third wire, the PE
(Protective Earth) wire allows several combinations to feed and receive signals into and from the LVDN. The Terms of
Reference of STF 410 [i.1] and various research publications [i.2], [i.3], [i.4] or [i.5] motivate MIMO PLT. They
describe up to 8 transmission paths might be used simultaneously by MIMO PLT.
Channel measurements as described in these publications are verified by STF 410. In many countries of the world new
electricity installations use 3 wires for connecting a single plug. Part 3 of this TR 6 provides information about the
presence of the PE wire.
All flats protected with RCD (Residual Current Devices) are equipped with a separate protective earth wire installed.
For example, the protective earth is mandatory for all new installations in Germany since the early 1970's. MIMO PLT
modems also utilize the protective earth. This enables them to feed differentially between phase to neutral (P-N), phase
to protective earth (P-PE) and neutral to protective earth (N-PE). The protective earth is grounded inside (e.g. at the
foundations) or outside (at the transformer station) the building. The grounding has to provide low impedance for the
50 Hz AC power. However, high frequency signal measurements show the PE wire to be a rather excellent
communication path which by no means represents a ground. This is due to the inductivity of the grounding wires.
If the differentially fed signals are converted to common mode, they propagate over the network, as well. For each pair
of outlets, the DM and the TTL (Transverse Transfer Loss) [i.5] attenuation are measured and statistical comparisons
are provided.
PLT MIMO Channel:
Feeding Receiving
�
P -P - NN
P -P - NN
N - PE
N - PE
P - PE
P - PE
CM
Figure 1: MIMO PLT channel matrix
ETSI
T d y: only PN PN
o a
8 ETSI TR 101 562-1 V1.
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