1. MAX Per BCC Data Rate Date: 2010-09-12 Authors: Month Year
doc.: IEEE yy/xxxxr0
MAX Per BCC Data Rate
Date:
Authors:
Slide 1
Jun Zheng, Broadcom
John Doe, Some Company

2. Max Data Rate for Each BCC Encoder
Due to the hardware limitations of Viterbi decoder, we need to set a threshold of the maximum data rate for each BCC encoder/decoder pair
Propose to use 600Mbps as the maximum per BCC data rate
It is a reasonable threshold within the current hardware limit
It will not lead to too many BCC encoder/decoder pairs, i.e. only 4 BCC encoders for the support of 160MHz-3streams-256QAM
802.11n had 300 Mbps per BCC encoder, and 600 Mbps per encoder can be achieved in most cases by simply doubling the clock speed which allows us to reuse the 11n viterbi decoder (with minor modifications)
Jun Zheng, Broadcom

3. Max Data Rate for Each BCC Encoder (Cont.)
For each MCS rate, the number of BCC encoders is calculated based on SGI (400ns guard interval)
E.g. for the case of 80MHz-2streams-mcs7-64QAM-R5/6:
800ns GI frame has PHY rate 585Mbps
400ns GI frame has PHY rate 650 Mbps
For both cases, 2 BCC encoders would be used
There should be no limit on the number of BCC encoders so that LDPC can be optional for all rates
Jun Zheng, Broadcom

4. Straw Poll
Do you support updating the IEEE Specification Framework for TGac to require that:
The maximum data rate per BCC encoder be 600Mbps
The number of BCC encoders for a particular combination of MCS, Nsts and BW be determined by the short GI data rate and that the same number of encoders be used for the corresponding normal GI rate
The number of BCC encoders not be limited?
Yes:
No:
Abs:
Jun Zheng, Broadcom