© 2004, B ROADBAND Physics, Inc. All Rights Reserved. Innovation Through Mathematics Call for...
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Transcript of © 2004, B ROADBAND Physics, Inc. All Rights Reserved. Innovation Through Mathematics Call for...
© 2004, BROADBANDPhysics, Inc. All Rights Reserved.
Innovation
Through
Mathematics
Call for Interest on Broadband Over Power Lines
7 June 2004, Denver CO, USA
Mark Laubach, CEO, N3BMNBroadband Physics, Inc.
San Jose, CA
2 © 2004, All Rights Reserved
Innovation
Through
Mathematics
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
3 © 2004, All Rights Reserved
Innovation
Through
Mathematics 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
4 © 2004, All Rights Reserved
Innovation
Through
Mathematics 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….
5 © 2004, All Rights Reserved
Innovation
Through
Mathematics SDM Overview
• Wavelet math inherently defines a multi-sub-band system– +55dB stop bands– Orthogonal in frequency and time
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
6 © 2004, All Rights Reserved
Innovation
Through
Mathematics SDM “Baseband”
• Full 18MHz– Maintains steep stop-bands– Flat topped– Well behaved
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
7 © 2004, All Rights Reserved
Innovation
Through
Mathematics 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
8 © 2004, All Rights Reserved
Innovation
Through
Mathematics Ham Radio Band Plans (MHz)
Band Region 1 Region 2 Region 3
160m 1.810-1.850 1.800-2.000 1.800-2.000
80m 3.500-3.800 3.500-4.000 3.500-3.900
60m 5.332-5.405
40m 7.000-7.100 7.000-7.300 7.000-7.100
30m 10.100-10.150 10.100-10.150 10.100-10.150
20m 14.000-14.350 14.000-14.350 14.000-14.350
17m 18.068-18.168 18.068-18.168 18.068-18.168
15m 21.000-21.450 21.000-21.450 21.000-21.450
12m 24.890-24.990 24.890-24.990 24.890-24.990
10m 28.000-29.700 28.000-29.700 28.000-29.700
9 © 2004, All Rights Reserved
Innovation
Through
Mathematics SDM Good Neighbor
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
10 © 2004, All Rights Reserved
Innovation
Through
Mathematics SDM Resiliency
• SDM isolates frequency noise impairments to specific sub-bands
0DB
-10DB
-20DB
-30DB
-40DB
-50DB
-60DB
Power
Frequency
Single Sub-BandEqualization Domain SDM
• SDM can be designed to be very resilient to phase noise ripple, group delay, micro-reflections, multi-path, etc.
11 © 2004, All Rights Reserved
Innovation
Through
Mathematics 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!
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
12 © 2004, All Rights Reserved
Innovation
Through
Mathematics Summary
• BoPL needs a sturdy foundation– SDM is a “brick wall” modulation with no “bandaids”– Highly flexible– Highly resilient to BoPL noise conditions
• BPI’s belief: if BoPL can conquer power lines and be friendly to adjacent services, can only be done via SDM
• BPI’s 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