part_6a_HP10_PHY - HomePlug 1.0 PHY R. Newman University of...

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HomePlug 1.0 PHY R. Newman University of Florida
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What is HomePlug 1.0? Broadband PLC for home networking Open industry standard 4 manufacturers (including Intellon) Developed in 2000 by Homeplug Powerline Alliance (HPA) Consortium of chip designers, OEMs, PLC users Products shipped in 2001 First ethernet class PLC, most widely available 11 Mbps coded PHY data rate 0ver 10 million units shipped Comprises PHY – modulation, coupling, FEC, etc. MAC – medium access, ARQ, etc. Bridging – to other PLC networks or to 803.3/11/etc.
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HP1.0 PHY Orthogonal Frequency Division Modulation Cyclic prefix Channel adaptation FEC Turbo product code RS/CC concatenated code Frames Preamble Delimiter PHY body Physical Carrier Sense (PCS)
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HP1.0 Transmitter Product Encoder Frame Control Interleaver Frame Control FEC Scrambler Reed- Solomon Encoder Convo- lutional Encoder Puncturing Bit Interleaver ROBO Interleaver Data FEC Mapping Insert Preamble IFFT Cyclic Prefix RC Shaping Power Line AFE
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HP1.0 Receiver Channel Estimation De- Interleaver Synchronization Detection Convert to Polar Demodulator De- Puncture Viterbi Decoder Reed- Solomon Decoder De- Scrambler FFT OFDM Demodulator Data FEC Decoder Frame Control De- Interleaver Product Decoder Frame Control FEC Decoder Power Line AFE
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HP1.0 OFDM 128 evenly spaced carriers 0-25 MHz 5.12us raw symbol time = 128/25MHz 256 IFFT samples at 50 MHz clock Cyclic prefix set to typical delay spread Reduces ISI 172 IFFT samples, with 8 samples roll-off 3.28us guard interval 8.4us total symbol time Cyclic Prefix T s OFDM Symbol Roll off Roll off Raw symbol
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Transmit Spectrum Mask 40 10 M A SK y . 0 2 4 6 8 10 12 14 16 18 20 2 24 26 28 30 10 95 90 85 80 75 70 65 60 5 50 45 40 POWER DBM / HZ FCC part 15 rules in North America restricts PSD Depends on frequency (other uses) Band used by HomePlug 1.0
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HP1.0 OFDM Band used is 4.49-20.7 MHz 84 carriers fall in that band (23-106) 8 carriers unused (FCC amateur bands) 76 usable carriers FCC Part 15 rules limit power spectral density
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part_6a_HP10_PHY - HomePlug 1.0 PHY R. Newman University of...

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