wifi: Document origin of formula

2018-08-13 18:41:44 -07:00
parent 9deaad5ae7
commit 26df85d8bf
1 changed files with 2 additions and 0 deletions
--- a/src/wifi/model/wifi-phy.cc
+++ b/src/wifi/model/wifi-phy.cc
@@ -2150,6 +2150,8 @@ WifiPhy::GetPayloadDuration (uint32_t size, WifiTxVector txVector, uint16_t freq
  else if (mpdutype == NORMAL_MPDU && preamble != WIFI_PREAMBLE_NONE)
    {
      //Not an A-MPDU
+      // The number of OFDM symbols in the data field when BCC encoding 
+      // is used is given in equation 19-32 of the IEEE 802.11-2016 standard.
      numSymbols = lrint (stbc * ceil ((16 + size * 8.0 + 6.0 * Nes) / (stbc * numDataBitsPerSymbol)));
    }
  else