1. John Kowalski/Sharp Labs
March 2001
The Case for FEC
John Kowalski/Sharp Labs
J. Kowalski, Sharp

2. The Case AV is a BIG market - emerging NOW.
March 2001
AV is a BIG market - emerging NOW.
Our competitors won’t wait (HL2, High Rate Bluetooth)
Standardization Delay= Bad press + Lose/Lose for all vendors
No demonstrated alternative yet.
FEC in MAC facilitates AV- low jitter, better BER performance
Careful design yields performance, transparency.
Solution results in good use of radio channel
J. Kowalski, Sharp

3. Objections Answered (1)
March 2001
Objections Answered (1)
Interleaver always needed-
Not for 11b with good retransmit scheme (can be at CL)
No reason to believe similar result can’t be realized for 11a.
“Not backward compatible”
11e frame formats can’t be exploited by legacy STAs anyway
A CL could STILL interpret FEC frames, if really needed
J. Kowalski, Sharp

4. Objections Answered (2)
March 2001
Objections Answered (2)
802.11a scrambler limits performance-
Loses can be made up for by selective retransmit at higher layer (no ACK) OR delayed ACK.
J. Kowalski, Sharp

5. March 2001
Objections Answered
J. Kowalski, Sharp