thanks.it's work. On Tue, Sep 12, 2017 at 8:10 PM, Mike McLernon <mike.mcler...@mathworks.com> wrote:
> Hi Seah, > > > Based on the error you're getting below, the coarse frequency offset (CFO) > estimator is receiving a real signal when it will accept only a complex > signal. Cast that signal to be complex before it enters the CFO estimator, > and you should eliminate that error. > > > Best, > > Mike > > > > > ------------------------------ > *From:* USRP-users <usrp-users-boun...@lists.ettus.com> on behalf of seah > chong via USRP-users <usrp-users@lists.ettus.com> > *Sent:* Tuesday, September 12, 2017 12:12 AM > *To:* usrp-users@lists.ettus.com > *Subject:* [USRP-users] the transmitter cannot receive the > acknowledgement from the receiver > > Hi all, > > Currently i'm doing a project to prove that the concurrent short > signalling in real environment. > > i am using MATLAB R2016A OS Ubuntu 14.04. USRP N210 using CBX > daughterboards. i have succesfully generate MEX function by following R. > Subramanian paper (https://github.com/80211bSDR/LinkLayer-MATLAB). > > <https://github.com/80211bSDR/LinkLayer-MATLAB> > GitHub - 80211bSDR/LinkLayer-MATLAB: This work is ... > <https://github.com/80211bSDR/LinkLayer-MATLAB> > github.com > LinkLayer-MATLAB - This work is supported by MathWorks under the > Development-Collaboration Research Grant. We would appreciate a citation to > our paper when this code ... > > > > > now, i'm try to run 1DTx (dtxPHYLayerVisual.m) and > 1Rx(drxPHYLayerVisual.m). before running the 1DTx and 1DRx,we need to run > the command below > > i ) at the DTx > > DTxInitParameters > swapFreqFlag = 0; %same channel operation > codegen transceiveXXX -args > {complex(zeros(1408,1)),true,txGain,rxGain,centerFreqTx,centerFreqRx,decFactor, > intFactor,swapFreqFlag} > > ii) at the DRx > > DRxInitParameters > codegen transceiveXXX -args > {complex(zeros(1408,1)),true,txGain,rxGain,centerFreqTx,centerFreqRx,decFactor, > intFactor} > > after complete the step above,we found errors when running the > 1DTx(dtxPHYLayerVisual.m) and 1DRx (drxPHYLayerVisual.m). The error come out > from DTxPHYlayerVisual.m as below: > > > > > > > > > > > > > > > > > *@ 3.06: 802.11b DATA Packet #1 Transmitted.xxxError using > coder.internal.errorIf (line 8)The input signal must be complex.Error in > comm.internal.CoarseFrequencyEstimatorBase/validateInputsImpl (line 70) > coder.internal.errorIf(isreal(x), ...Error in rffe (line 66) ofs = > step(he,ddf);Error in dtxPHYLayerVisual>dtx_3ReceiveACK (line 453) dfr > (1:halfUsrpFrameLength)= rffe(df,ft,cas,cau,cef);Error in dtxPHYLayerVisual > (line 81) [faf,dfl,flg,nrb,rbs,st] = dtx_3ReceiveACK(df,ft,st);* > > From these errors, we know that the transmitter cannot receive the > acknowledgement from the receiver. I've suspected these errors are due to > wrong declaration of IPaddress. Currently, I've setup the IP Address DTx is > 192.168.10.2 and DRx is 192.168.10.20.is our declaration is correct or not? > > I hope someone can enlighten me either it is due to the IPaddress or other > issues and can give me the solutions. > > Regards, > > ChongSeah > > >
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