[ndnSIM] change Data rate in 802.11a

[lzy]

in my script，i use 802.11a for my wifi rate，it highest speed is 54mbps，but actually  the top rate is 6Mbps (or lower)  when i run my script,it seems that wifi station can mostly handle 350 packet/s. is there anyone who can help me to solve this problem?here are my defination.


 std::string phyMode ("OfdmRate54Mbps");
 WifiHelper wifi;
 wifi.SetStandard (WIFI_PHY_STANDARD_80211a);
 YansWifiPhyHelper wifiPhy =  YansWifiPhyHelper::Default ();
 wifiPhy.SetPcapDataLinkType (YansWifiPhyHelper::DLT_IEEE802_11_RADIO);
 wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager",
        "DataMode",StringValue (phyMode),
        "ControlMode",StringValue (phyMode));
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