NetSim Support Portal

Receiver Sensitivity, Received Power and Phy Data Rate in 802.11 can be logged into a text or CSV file and then be plotted as per your requirement. 

Following is one such example where we log these parameters into a comma-separated CSV file. The steps involved may vary between different versions of NetSim. Choose the appropriate section of this article, as per the version of NetSim.

Modifying the source codes:

1. Open NetSim source code in Visual Studio by clicking on the Open Code button present in NetSim Home Screen via Open Simulation->Workspace Options->Open Code. 
2. Go to the IEEE802_11 project through the solution explorer and open the file IEEE802_11.c Add the lines of code highlighted in red inside the fn_NetSim_IEEE802_11_Init() function as shown below:                      
                                                                                                                                                                                                  _declspec(dllexport) int fn_NetSim_IEEE802_11_Init(struct stru_NetSim_Network *NETWORK_Formal,         NetSim_EVENTDETAILS *pstruEventDetails_Formal,char *pszAppPath_Formal,char *pszWritePath_Formal,
   int nVersion_Type)
   {
       char s[BUFSIZ];
       sprintf(s, "%s", "802_11_log.csv");
       FILE* fp = fopen(s, "w+");

       if (fp)

       {

       fprintf(fp, "Packet_ID,TX_ID,RX_ID,RX_POWER(dBm),RX_SENSITIVITY(dBm),DATA_RATE(Mbps)");

       fclose(fp);

       }

   return fn_NetSim_IEEE802_11_Init_F(NETWORK_Formal,
   pstruEventDetails_Formal,pszAppPath_Formal,
   pszWritePath_Formal,
   nVersion_Type);
   }                                                                                                                                                                                                
3. Add the lines of code highlighted in red inside the fn_NetSim_IEEE802_11_PhyIn() function under  IEEE802_11_Phy.c as shown below:                                                                                                                                                                      int fn_NetSim_IEEE802_11_PhyIn()

       {

        double dFadingPower=0;

        NetSim_PACKET* packet = pstruEventDetails->pPacket;

         .

         .

         .

         .

        double pdbm = GET_RX_POWER_dbm(packet->nTransmitterId, ifid,

        pstruEventDetails->nDeviceId,pstruEventDetails->nInterfaceId,    

        packet->pstruPhyData->dArrivalTime);                  

        char s[BUFSIZ];

        sprintf(s, "%s", "802_11_log.csv");

        FILE* fp = fopen(s, "a+");

        if (fp)

       {

        fprintf(fp, "\n%d,%d,%d,%f,%f,%f", pstruEventDetails->nPacketId, packet->nTransmitterId, packet->                  nReceiverId, pdbm, srcPhy->dCurrentRxSensitivity_dbm, srcPhy->PHY_TYPE.ofdmPhy.dDataRate);

       fclose(fp);

       }

        if (pdbm < srcPhy->dCurrentRxSensitivity_dbm)

        {

        set_radio_state(pstruEventDetails->nDeviceId, pstruEventDetails->nInterfaceId,

        RX_ON_IDLE, packet->nTransmitterId, 

        phy->firstPacketTransmissionId ? phy->firstPacketTransmissionId : hdr->transmissions);

        return -1; // dest is not in range

        }  

4. Choose the appropriate platform (win32 /x64) according to 32-bit or 64-bit build of NetSim used.
5. Now right click on the IEEE802_11 module in the solution explorer and select rebuild. 
6. Upon a successful build, NetSim will automatically take care of updating the respective binaries in the current workspace. 
7. After running any WLAN simulation, the output log file can be found in the <NetSim_Install_Directory>/bin folder. For Eg: Eg: C:\Program Files\NetSim Standard\bin 

1. Open NetSim source code in Visual Studio by clicking on the Open Code button present in NetSim Home Screen via Open Simulation->Workspace Options->Open Code. 
2. Go to the IEEE802_11 project through the solution explorer and open the file IEEE802_11.c Add the lines of code highlighted in red inside the fn_NetSim_IEEE802_11_Init() function as shown below:                      
                                                                                                                                                                                                  _declspec(dllexport) int fn_NetSim_IEEE802_11_Init(struct stru_NetSim_Network *NETWORK_Formal,         NetSim_EVENTDETAILS *pstruEventDetails_Formal,char *pszAppPath_Formal,char *pszWritePath_Formal,
   int nVersion_Type)
   {
       char s[BUFSIZ];
       sprintf(s, "%s\\%s", pszIOLogPath, "802_11_log.csv");
       FILE* fp = fopen(s, "w+");

       if (fp)

       {

       fprintf(fp, "Packet_ID,TX_ID,RX_ID,RX_POWER(dBm),RX_SENSITIVITY(dBm),DATA_RATE(Mbps)");

       fclose(fp);

       }

   return fn_NetSim_IEEE802_11_Init_F(NETWORK_Formal,
   pstruEventDetails_Formal,pszAppPath_Formal,
   pszWritePath_Formal,
   nVersion_Type);
   }                                                                                                                                                                                                
3. Add the lines of code highlighted in red inside the fn_NetSim_IEEE802_11_PhyIn() function under  IEEE802_11_Phy.c as shown below:                                                                                                                                                                                    int fn_NetSim_IEEE802_11_PhyIn()

       {

        double dFadingPower=0;

        NetSim_PACKET* packet = pstruEventDetails->pPacket;

         .

         .

         .

         .

        double pdbm = GET_RX_POWER_dbm(packet->nTransmitterId, ifid,

        pstruEventDetails->nDeviceId,pstruEventDetails->nInterfaceId,    

        packet->pstruPhyData->dArrivalTime);                  

        char s[BUFSIZ];

        sprintf(s, "%s\\%s", pszIOLogPath, "802_11_log.csv");

        FILE* fp = fopen(s, "a+");

        if (fp)

       {

        fprintf(fp, "\n%d,%d,%d,%f,%f,%f", pstruEventDetails->nPacketId, packet->nTransmitterId, packet->                  nReceiverId, pdbm, srcPhy->dCurrentRxSensitivity_dbm, srcPhy->PHY_TYPE.ofdmPhy.dDataRate);

       fclose(fp);

       }

        if (pdbm < srcPhy->dCurrentRxSensitivity_dbm)

        {

        set_radio_state(pstruEventDetails->nDeviceId, pstruEventDetails->nInterfaceId,

        RX_ON_IDLE, packet->nTransmitterId, 

        phy->firstPacketTransmissionId ? phy->firstPacketTransmissionId : hdr->transmissions);

        return -1; // dest is not in range

        }  

4. Choose the appropriate platform (win32 /x64) according to 32-bit or 64-bit build of NetSim used.
5. Now right click on the IEEE802_11 module in the solution explorer and select rebuild. 
6. Upon a successful build, NetSim will automatically take care of updating the respective binaries in the current workspace. 
7. Now on running any simulation in IEEE802.11, you will get a log file containing Receiver Sensitivity, Received Power and Phy Data Rate, which can be opened from the results dashboard as follows:  

Note:

The above code modifications are applicable for WLAN standards such as 802.11 a, g and p. In case of standards such as 802.11 n and ac modify the line

In case of standard 802.11b, modify the line

as

Result and Analysis:

The log file containing Receiver Sensitivity, Received Power and Phy Data Rate will be as shown below:                                                                                        

Related articles:

• https://support.tetcos.com/en/support/solutions/articles/14000104254-how-do-i-write-code-to-see-the-received-power-in-a-simple-two-node-wireless-system-
• https://support.tetcos.com/en/support/solutions/articles/14000071456-what-is-the-netsim-api-to-calculate-received-power-between-two-wireless-nodes-in-wlan-
• https://support.tetcos.com/en/support/solutions/articles/14000071587-what-are-the-different-phy-rates-in-802-11b-
• https://support.tetcos.com/en/support/solutions/articles/14000089068-how-is-the-phy-rate-decided-in-netsim-802-11-