Questions about demod11

• 2012年6月30日 3:34

   

   
  

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   Hi, everyone! I'm trying to use demod11 for offline test and the protocol I use is protocol 802.11a. But I have some questions.

   First, as I comprehend, TestMod11A reads one frame from input file, implenments OFDM modulation and then writes the modulated symbols to output file (***.tx). ConvertModFile2DumpFile converts tx file to rx signal file (***.dmp). If this rx signal file is obtained, I can call CsFrameDemod to demodulate the original data. Here, I have a question. If I reads several frames from input file, OFDM-modulate them and writes to output file, and then I convert the file to rx signal file, can I simply call CsFrameDemod to demodulated all these frames? I wonder after PrepareSigStream is called,  BB11ARxFrameDemod will separate these frames or not.

   Second, I have no idea what the segment codes below performs.

          // Possible the scan pointer wraps to the buffer header
          dReq = buffer_span(pbSPTemp, SoraRadioGetRxStreamPos(&RxStream), SoraRadioGetRxStreamSize(&RxStream)) * 28.0 / 40;
          dCost = TimerRead(&ti) * 1000;
          dRatio = dCost / dReq;

          printf("[noise]  req: %9.3fus  cost: %9.3fus \n", dReq, dCost);
          iNoiseCounter++;
          dNoiseAverage += dRatio;
          dNosieSD += dRatio * dRatio;
          dNoiseMax = (dNoiseMax >= dRatio)?dNoiseMax : dRatio;
          if (dRatio >= 0.8)
          {
              dNoiseAbove0_8Counter++;
              if (dRatio >= 1.0)
              {
                  dNoiseAboveCounter++;
              }
          }

   Waiting for your answer. Thanks.

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