Re: [Discuss-gnuradio] gr-lte：can't decode MIB

Kevin, The output rate of a 3072 Interpolation, 1000 Decimation resampler is, per definition, 3.072 of the input rate, because from every single input sample, it generates 3072 intermediate samples, correctly anti-image-filtering that , and from every 1000 intermediate samples, correctly anti-alia

Re: [Discuss-gnuradio] gr-lte：can't decode MIB

Thank you ,johannes.I set the Resampler as: Interpolation:3.072k, Decimation :1k ,and the N_rb_dl=50, fft_length=2048. How should I set the sample_rate of USRP N210 to match the flowgragh? Best wishes! -- View this message in context: http://gnuradio.4.n7.nabble.com/gr-lte-can-t-decode-MIB-t

Re: [Discuss-gnuradio] gr-lte：can't decode MIB

-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Kevin, Marcus's hint would've been the first thing I'd have mentioned. Also, your flowgraph expects the samples to be resampled to 30.72Msps. It is really important that you match the sampling rate the flowgraph expects. Cheers Johannes On 16.12.

Re: [Discuss-gnuradio] gr-lte：can't decode MIB

Hi Kevin, > The source file is recorded from USRP N210 with a samp_rate of 15.36M, It cannot be, because the N210 doesn't support that rate. Did you correctly resample to 15.36MS/s before saving it to 1.dat? Best regards, Marcus On 16.12.2015 06:10, kevin_L wrote: > Hi,johannes,I deactivate th

Re: [Discuss-gnuradio] gr-lte：can't decode MIB

Hi,johannes,I deactivate the PCFICH block and the results are shown below. The source file is recorded from USRP N210 with a samp_rate of 15.36M, but the results showed of "ofdm_lte_remove_cp_cvc_0 OUT of sync. I don't know what the problem is,please help me ,thank you.

Re: [Discuss-gnuradio] gr-lte：can't decode MIB

-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Kevin, First of all, all those D's indicate that you drop packets. Record your samples and use a File source in your flowgraph to get rid of this. The flowgraph should decode 10 CFI's per frame while it decodes one MIB at most. Deactivate the PCFI

Re: [Discuss-gnuradio] gr-lte：can't decode MIB

Hi,Johannes, I am a little confused about what you said . You said that all of the MIBs are published.But I didn't see any of the MIBs,such as the N_ant,N_rb_dl.What I can see is the CFI messages.the following picture is my result. I don't know what's going wrong,please help me figure it out.Thank

Re: [Discuss-gnuradio] gr-lte：can't decode MIB

-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Kevin, the MIB carries a few parameters. All of them are published. Do you refer to SIBs? Those aren't implemented. I'd be happy to accept Pull Requests which add those features. CFI calculation might need some bugfixing because there position is n

Re: [Discuss-gnuradio] gr-lte：can't decode MIB

Hi,Johannes ,I set everthing right as you told me . It published the CFI messages and the MIB decoding rate is 1.00 ,but why it didn't publish the detailed MIB messages? Should I change your codes"unpack_mib_vcvc_impl.cc"to publish the detailed MIB messages? Or is there something I missed? Best wi

Re: [Discuss-gnuradio] gr-lte：can't decode MIB

-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Kevin, I assume you use a N2x0. UHD tells you that the requested sample rate is not supported and even exceeds the connection capacity. Then the resampler does upampling by a large factor which will feed the flowgraph with the wrong sample rate.

[Discuss-gnuradio] gr-lte：can't decode MIB

Dear Johannes,I use the usrp source, and ran the "lte_top_block_siso",but it just stucked. Should I impove my computer performance？ Or is there something wrong with my flowgragh? Wait for your reply,thank you! the two pictures following are my outputs.