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HomePlug AV PHY

(c) 2013 R. Newman University of Florida. HomePlug AV PHY. What is HomePlug AV?. Broadband PLC for home networking Open industry standard 6+ manufacturers (including Intellon) Developed 2003-2007 by Homeplug Powerline Alliance (HPA) Consortium of chip designers, OEMs, PLC users

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HomePlug AV PHY

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  1. (c) 2013 R. Newman University of Florida HomePlug AV PHY

  2. What is HomePlug AV? • Broadband PLC for home networking • Open industry standard • 6+ manufacturers (including Intellon) • Developed 2003-2007 by Homeplug Powerline Alliance (HPA) • Consortium of chip designers, OEMs, PLC users • Products shipped in 2006 • Second ethernet class PLC, most widely available • 150 Mbps coded PHY data rate • 0ver 40 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.

  3. Reference Model

  4. Protocol Layer Architecture

  5. HPAV Networks • Physical Network (PhyNet) • Relative to a station (STA) • All other STAs able to communicate with the reference STA • Logical Network (AVLN) • Has a Central Coordinator (CCo) STA • Set of STAs with same • Network ID (NID) and • Network Membership Key (NMK) (usually)

  6. AV Logical Networks • Neighbor networks • Hidden nodes

  7. HPAV STA Roles • STA = Level-0 CCo (no QoS support) • Assoc/Authenticate new STA • TEI provisioning • CSMA operation • Neighbor Network (NNW) passive coordination • Level-1 CCo = Level-0 plus: • TDMA operation/scheduling/admission control • GLID provisioning • Uncoordinated mode with NNWs • Level-2 CCo = Level-1 plus: • Coordinated mode with NNWs

  8. HPAV PHY • Windowed OFDM – 917 carriers 1.8 – 30 MHz • 40.96us symbol time, 4.96us rolloff • Variable Cyclic Prefix • Turbo Convolution Codes, copy codes • Robust Frame Control (-5 dB) • Robo Modes (5 & 10 Mbps) • Bit Loaded Payload • Tone Maps synchronized with AC line cycle • coherent modulation up to 1024-QAM • 200 Mbps channel rate/150 Mbps information rate

  9. HPAV Transceiver

  10. HPAV Transmitter • Data paths for HP1.0.1 FC, AV FC, and payload • Turbo convolutional encoders for AV paths • Architecture similar to HP 1.0.1 transmitter

  11. HPAV Receiver • 384 point FFT for HP1.0.1 FC • 3072 point FFT for AV FC and payload • Turbo convolutional decoders for AV paths

  12. HPAV OFDM • 1155 evenly spaced carriers 1.80-30.00 Mhz • 917 carriers used for modulation • notch amateur/government bands • 24.414 kHz carrier spacing • 40.96 usec raw symbol duration • Cyclic Prefix (CP) has three lengths • Set by tone map during channel adaptation • 4.96 usec roll-off interval + variable Guard Interval • 18.32 usec GI for Frame Control • 5.56 usec GI for Robo, HS-Robo • 7.56 usec GI for mini-Robo • 47.12, 7.56, and 5.56 usec GI for negotiated TMs

  13. HPAV OFDM • Modulation • Coherent modulation used • BPSK, QPSK, 8-QAM, 16-QAM, 64-QAM, 256-QAM, 1024-QAM (1,2,4,6,8,10 bits/carrier) • Negotiated TMs • Carriers bit-loaded • Robust Modulation Modes • QPSK all unmasked carriers, rate ½ turbo code • GI and interleaving redundancy differs (4, 2, 5 copies) • Robo ~ 5 Mbps, 520 octet PHY Block (PB520) • High-speed Robo ~ 10 Mbps, PB520 • mini-Robo ~ 4 Mbps, 136 octet PB (PB136)

  14. HPAV PHY Frames • 4 PPDU Formats • AV-Only Short PPDU • Only HPAV preamble and Frame Control (FC) • AV-Only Long PPDU • Like above, but with (data) payload • Hybrid Short PPDU • Hybrid preamble, HP1.0 FC and HPAV FC • Hybrid Long PPDU • Like above, but with (data) payload

  15. HPAV PHY Payload • Forward Error Correction (FEC) blocks • 520 octet or 136 octet length • 4 Modulation Types • Fixed: ROBO, High-speed ROBO, Mini-Robo • Negotiated Tone Maps (channel capacity) • 5 PHY Payload Formats • Mini-ROBO + one 136-octet FEC Block • ROBO + one 520-octet FEC Block • High-Speed ROBO + 1-3 520-octet FEC Blocks • Negotiated TM + one 136-octet FEC Block • Negotiated TM + >= 1 520-octet FEC Blocks

  16. AV Mode Long PPDU • AV-Only Delimiter • Preamble of 7.5 SYNCP and 2.5 SYNCM symbols • HPAV FC may have 2 symbols • Second FC symbol used when many carriers masked • Cyclic prefix fixed on first 2 payload symbols • CP assigned by TM after that

  17. HPAV Hybrid Long PPDU • Hybrid Delimiter • Preamble of 7.5 SYNCP and 1.5 SYNCM symbols • HPAV FC may have 2 symbols • Cyclic prefix fixed on first 2 payload symbols • CP assigned by tone map after that

  18. HPAV Symbol • 75 MHz Clock • 3072-point IFFT (40.96 usec) • Roll-off Interval (RI) = 372 samples (4.96 usec) • Guard Interval (GI) variable • 1374 samples for FC (18.32 usec) • 417, 567, or 3534 samples for data • 417 for Robo + HS-Robo, 567 for mini-Robo

  19. HPAV Special Symbols • Detection of these used for Physical Carrier Sense (PCS) • SYNCP and SYNCM symbols • Used only in preamble • Omit CP (raw symbols only – repeated) • SYNCM is SYNCP inverted • Priority Resolution Signal • Derived from HP 1.0.1 PRS • Add HPAV carriers • Reverse sign of phases used in preamble

  20. Frame Control FEC Encoder • Rate ½ turbo convolutional encoder • Interleaver • Diversity copier • QPSK on all unmasked carriers • Q-channel offset by 128 from I-channel • A second symbol (if needed) starts with bit address offset by 64 from first symbol

  21. Payload FEC Encoder • Turbo convolutionalencoder • Two rate 2/3 recursive systematic convolutional (RSC) constituent codes • Both have 8 states • Support 520, 136, 16 octet blocks • Rate ½ or 16/21 after puncturing

  22. HPAV NA Transmit Spectrum Mask Band used by HomePlug AV

  23. HPAV Spectral Occupancy

  24. HPAV Carrier Spectral Occupancy Band used by HomePlug 1.0

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