Hi , johannes, thank you for your reply. I use the recorded samples from the matlab lte system tools. It can decode the MIB successfully. But when i use the recorded samples from the usrp N210, ( I set the usrp N210 with the samp_rate =10M ,and connect to a resampler with the interpolation of 3072,the decimation of 1000,then connect to a file sink .) I use the file sink as the input of the "lte_top_block_siso",I set the samp_rate of the flowgraph to 30.72M,fft_len =2048 .N_rb_dl=50, but the results shows "ofdm_lte_remove_cp_cvc_0 OUT of sync" so where the problem locates?
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