RATE_HT_MCS_RATE_CODE_MSK_V1
idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK_V1;
thr = thresh_tpt[rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK_V1];
rate_v1 & RATE_HT_MCS_RATE_CODE_MSK_V1;
RATE_HT_MCS_RATE_CODE_MSK_V1);