1. The PBCC 22 Mbps Extension of IEEE 802.11b
Chris Heegard, Ph.D.,
Sean Coffey, Ph.D., Anuj Batra, Ph.D., Srikanth Gummadi and Matthew Shoemake, Ph.D. Home and Wireless Networking
March 12, 2001
Texas Instruments
141 Stony Circle, Suite 130
Santa Rosa California
(707)
Chris Heegard, TI

2. Content Review of PBCC Technology IP Statement Market Issues Summary
Chris Heegard, TI

3. Short History of PBCC Alantro Communications incorporated, August 1997
Blending the Theory of Information with the Art of Silicon
PBCC-11 introduced in IEEE
64 State Binary Convolutional Code + Signal Scrambler
Introduced in March 1998 meeting
Adapted as “High Performance” option
Although it provided a more robust solution, +3dB C.G., it was deemed “too complex”
Time to market was a major factor in selection of CCK
Harris semiconductor had a working MBOK chip
Chris Heegard, TI

4. Movitation for Higher Performance
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5. History (cont) PBCC-22 developed beginning in summer of 1998
Constraints
Interoperability with IEEE b networks
Translate coding gain advantage to “double the data rate”
22 Mbps
Compatibility with IEEE b radios
8-PSK, 11 MHz symbol rate, short preamble
Operate in the same environment as CCK-11
64 state code --->> 256 state code
A good engineering solution: cost versus performance
Satisfy FCC Requirements
Chris Heegard, TI

6. Packet Binary Convolutional Coding
Combines Binary Convolutional Coding with Codeword Scrambling
PBCC-22 Rate k=2, n=3 encoder
256 state
Digital-8PSK modulation
Dfree^2/Es = 704/98 = 8.6 dB
Reference: 16QAM+Interleaved (k=1,n=2) 64 state BCC
Dfree^2/Es = 40/10 = 6.0 dB (-2.6 dB)
Chris Heegard, TI

7. PBCC Components
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8. BCC Encoder for 22Mbps
PBCC-22:
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9. Digital 8-PSK
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10. The Transmitted Signal
Barker 2
CCK 11
PBCC 11
PBCC 22
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11. AWGN Performance
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12. Chris Heegard, TI

13. Chris Heegard, TI

14. Receiver Approach
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15. Multipath Performance
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16. Multipath Performance (cont)
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17. IP Statements
TI believes strongly in market acceleration and expansion for wireless Ethernet and seeks to serve as much of this demand with its chip offerings
TI formally offered royalty free patent licenses for its High Rate submission on a reciprocal basis, providing it is adopted as the standard
Chris Heegard, TI

18. Commercial Questions What does the market really want?
ie, versus. what technologies can be grafted together
Will the proposed solution accelerate or confuse marketplace?
Does the proposed solution enlarge the market?
When does the marketplace benefit from the solution?
How is the proposed solution going to be positioned and presented to the market?
802.11b+?, a-, a+b?, g…
Chris Heegard, TI

19. Conclusions PBCC is an innovative new code that solves a real problem
Backward compatible with IEEE b standard
Backward compatible with radio and regulatory requirements
“Doubles the Data Rate” in the same environment
PBCC solution
Time to market advantages
It is already in the standard; the proposal simply extends it
Marketplace is seeking faster, simpler products - sooner
Chris Heegard, TI