MAX Per BCC Data Rate Date: 2010-09-12 Authors: Month Year doc.: IEEE 802.11-yy/xxxxr0 MAX Per BCC Data Rate Date: 2010-09-12 Authors: Slide 1 Jun Zheng, Broadcom John Doe, Some Company

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

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

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