standards for low and medium voltage power lines Both standards based upon multicarrier via OFDM midfrequency kHz operation narrowband lower data rates Competing PLC standards ID: 675407
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Slide1
G3 and PRIME are
international standards for low and medium voltage power lines. Both standards based upon:multicarrier via OFDMmid-frequency(kHz) operationnarrowband (lower data rates)
Competing PLC standards
Power Line
Communications for Enabling Smart Grid Applications
Prof
. Brian L.
Evans, Embedded Signal Processing Laboratory, The University of Texas at AustinStudents: Jing Lin, Yousof Mortazavi, Marcel Nassar, Karl Nieman
“LAST MILE” OF SMART GRID
Communications over
low and medium voltage
infrastructure (at the neighborhood level)smart energy management (dynamic load balancing)automated meter readingdevice-specific billinghome area networks for rural customers
STANDARDS AND BEYOND
The use of MIMO techniques across multiple phase systems (
i.e. phase, neutral and ground) could potentially double or even triple currently-achievable data rates. However, cross-talk induced by coupling between the wires could reduce ultimate throughput.
CHANNEL IMPAIRMENTS
Objective
: Develop real-time bi-directional power line communications (PLC) transceiver testbed to aid in system design and algorithm analysis.
AFE
AFE
AFE
AFE
ECHO
TX A
TX B
RX C
RX D
RX A
RX B
TX C
TX D
NEXT
FEXT
NEXT
mode 1
mode 0
Powerline
Our prior work on a real-time
wired 2x2 MIMO
OFDM system achieved 2x data rate using:
Far-end crosstalk cancellation
Near-end crosstalk cancellation
Other adaptive algorithms
DELIVERABLES
Ongoing work:
single-transmitter single-receiver (1x1)
powerline
communication
testbed
Looking ahead:
multiple-transmitter multiple-receiver (MIMO)
powerline
communication
testbed
REAL-TIME PLC TESTBED
Hardware
Software
National Instruments
(NI) controllers
stream data
NI
cards generate/receive
analog
signals
Texas Instruments
front end couples to power line
Real-time
system
runs transceiver
algorithms
Desktop PC running
LabVIEW is used as an input and visualization tool to display important system parameters.
Local power
a
rea network
Parameter
PRIME
G3Transmission band42-89 kHz35.9-90.6 kHzSampling frequency250 kHz400 kHzFFT length 512256Cyclic prefix length4830Subcarrier spacing488 Hz1.65625 kHzOFDM symbol duration2240 μs640 μsMax data rate128.6 kbps33.4 kbps
Our Approach: Multichannel (MIMO) OFDM over Power Line
Estimates of noise power spectra for indoor AC outlet (top) and St. Louis outdoor PLC field trial (bottom) measurements
Bit rates over a 1000 ft CAT-5e cable using 2x2 MIMO OFDM testbed
Interference sources in PLC systems
Channel model:Mitigation methods:non-AWGN receiver (cyclostationary noise model accepted into IEEE 1901.2)estimate noise statistics w/ null tonesreduced complexity noise shapingequalization, dynamic bit allocation
Objective:
Deploy ESPL-developed techniques to mitigate non-Gaussian noise in real-time testbed.
PLC
testbed
with suite of
user-selectable
algorithms
filter
+
+
fading
Gaussian
non-Gaussian
SRC support via
Freescale
, IBM, and Texas Instruments, GRC
Task
1836.063