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Power Line Communications for Enabling Smart Grid Applications

Prof . Brian L. Evans, Embedded Signal Processing Laboratory, The University of Texas at Austin Students: Jing Lin, Yousof Mortazavi , Marcel Nassar , Karl Nieman.

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Power Line Communications for Enabling Smart Grid Applications

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  1. Prof. Brian L. Evans, Embedded Signal Processing Laboratory, The University of Texas at Austin Students: Jing Lin, YousofMortazavi, Marcel Nassar, Karl Nieman Objective: Develop real-time bi-directional power line communications (PLC) transceiver testbed to aid in system design and algorithm analysis. CHANNEL IMPAIRMENTS “LAST MILE” OF SMART GRID • Channel model: • Mitigation methods: • non-AWGN receiver (cyclostationarynoise model accepted into IEEE 1901.2) • estimate noise statistics w/ null tones • reduced complexity noise shaping • equalization, dynamic bit allocation • Communications over low and medium voltage • infrastructure (at the neighborhood level) • smart energy management • (dynamic load balancing) • automated meter reading • device-specific billing • home area networks for • rural customers filter + + fading Gaussian non-Gaussian Local power area network Power Line Communications for Enabling Smart Grid Applications STANDARDS AND BEYOND Interference sources in PLC systems Estimates of noise power spectra for indoor AC outlet (top) and St. Louis outdoor PLC field trial (bottom) measurements Competing PLC standards • G3 and PRIME are international standards for low and medium voltage power lines. • Both standards based upon: • multicarrier via OFDM • mid-frequency • (kHz) operation • narrowband • (lower data rates) REAL-TIME PLC TESTBED • Objective: Deploy ESPL-developed techniques to mitigate non-Gaussian noise in real-time testbed. • Our Approach: Multichannel (MIMO) OFDM over Power Line 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. PLC testbed with suite of user-selectable algorithms Powerline RX A TX A AFE AFE mode 0 ECHO TX C RX C NEXT FEXT NEXT RX B TX B AFE AFE mode 1 TX D RX D • 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 Bit rates over a 1000 ft CAT-5e cable using 2x2 MIMO OFDM testbed DELIVERABLES • Ongoing work: single-transmitter single-receiver (1x1) powerline communication testbed • Looking ahead: multiple-transmitter multiple-receiver (MIMO) powerline communication testbed SRC support via Freescale, IBM, and Texas Instruments, GRC Task 1836.063

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