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© 2004, B ROADBAND Physics, Inc. All Rights Reserved. Innovation Through Mathematics Call for Interest on Broadband Over Power Lines 7 June 2004, Denver CO, USA Mark Laubach, CEO, N3BMN Broadband Physics, Inc. San Jose, CA
© 2004, All Rights Reserved Innovation Through Mathematics 2 Power Lines are a Harsh Mistress for high speed communications RF Environment –Power lines are bad antenna –History of being a bad neighbor to other services Harsh ingress noise environment –Tough on modulation for high bit rate with low errors –Constantly changing impairments
© 2004, All Rights Reserved Innovation Through Mathematics 3 Looking Forward The Physical Layer must be of sound foundation –reliable high capacity digital service –a good neighbor, today and in the future. Nothing else matters Everything else is enabled
© 2004, All Rights Reserved Innovation Through Mathematics 4 Broadband Physics Sub-band Division Multiplexing (SDM) –Wavelet mathematics applied to digital signaling –Carrier-less –Quadrature matched filter approach Filtering / de-filtering of well shaped impulses –+55dB designed stop-band per Sub-Band –High phase-noise and phase ripple resiliency –Highly flexible –No cyclic-prefix or Time Domain Equalizer –and more….
© 2004, All Rights Reserved Innovation Through Mathematics 5 SDM Overview Wavelet math inherently defines a multi-sub-band system –+55dB stop bands –Orthogonal in frequency and time
© 2004, All Rights Reserved Innovation Through Mathematics 6 SDM Baseband Full 18MHz –Maintains steep stop-bands –Flat topped –Well behaved
© 2004, All Rights Reserved Innovation Through Mathematics 7 SDM Flexibility and Integrity Unique sub-bands can be controlled via software –On / off –Depth of modulation 2bits/second/Hz through 12bits/second/Hz –Key to Good Neighbor to other services –Key to future proofing (flexibility) Frequency domain impairments isolated to specific sub-bands –Well isolated due to stop-band performance –Key to phase and impairment resiliency
© 2004, All Rights Reserved Innovation Through Mathematics 8 Ham Radio Band Plans (MHz)
© 2004, All Rights Reserved Innovation Through Mathematics 9 SDM Good Neighbor
© 2004, All Rights Reserved Innovation Through Mathematics 10 SDM Resiliency SDM isolates frequency noise impairments to specific sub-bands 0DB -10DB -20DB -30DB -40DB -50DB -60DB Power Frequency Single Sub-Band Equalization Domain SDM SDM can be designed to be very resilient to phase noise ripple, group delay, micro-reflections, multi-path, etc.
© 2004, All Rights Reserved Innovation Through Mathematics 11 Very Low Spectral Regrowth 2 sub-bands off creates +50dB notch Approx 3dB regrowth for 18Mhz wide modulation Additive White Gaussian Noise (AWGN) only in notches, 50dB down!
© 2004, All Rights Reserved Innovation Through Mathematics 12 Summary BoPL needs a sturdy foundation –SDM is a brick wall modulation with no bandaids –Highly flexible –Highly resilient to BoPL noise conditions BPIs belief: if BoPL can conquer power lines and be friendly to adjacent services, can only be done via SDM BPIs position: –Fully patented 7 U.S., 1 Canadian –If IEEE process were to select SDM technology, BPI would be willing to license on a customary non-discriminatory basis for a reasonable fee –BPI technology ready to vet this summer Needs interested parties/company
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