It's telling you there's a mismatch in the vector size (based on the FFT
length) between the FFT block and the Cyclic Prefixer block. It appears
you have the FFT block set to 512/8 = 64 and the Cyclic Prefixer block
set to 8/8 = 1.
Unless you're just writing this block as an exercise, if you set the
rolloff to 0 in the built-in Cyclic Prefixer block, the rolloff is
disabled completely.
Ron
On 4/13/19 14:27, Simran Kaur wrote:
Hi Team,
I am trying to make own cyclic prefix block in C++ in GNU
Radio(removing roll-off part and keeping all other parameters same).
After connecting my cyclic_prefix block to the already present FFT
block in tx_ofdm.grc, i am getting the following error:
Executing: /usr/bin/python2 -u
/home/labuser/workarea-gnuradio/gnuradio/gr-digital/examples/ofdm/tx_ofdm.py
Traceback (most recent call last):
File
"/home/labuser/workarea-gnuradio/gnuradio/gr-digital/examples/ofdm/tx_ofdm.py",
line 352, in
main()
File
"/home/labuser/workarea-gnuradio/gnuradio/gr-digital/examples/ofdm/tx_ofdm.py",
line 340, in main
tb = top_block_cls()
File
"/home/labuser/workarea-gnuradio/gnuradio/gr-digital/examples/ofdm/tx_ofdm.py",
line 239, in __init__
self.connect((self.fft_vxx_0, 0), (self.cyclicprefix_CP_cc_0, 0))
File
"/usr/local/lib/python2.7/dist-packages/gnuradio/gr/hier_block2.py",
line 47, in wrapped
func(self, src, src_port, dst, dst_port)
File
"/usr/local/lib/python2.7/dist-packages/gnuradio/gr/hier_block2.py",
line 110, in connect
self.primitive_connect(*args)
File
"/usr/local/lib/python2.7/dist-packages/gnuradio/gr/runtime_swig.py",
line 5334, in primitive_connect
return _runtime_swig.top_block_sptr_primitive_connect(self, *args)
ValueError:*itemsize mismatch: fft_vcc_fftw0:0 using 512, CP_cc0:0
using 8*
*NOTE:* CP_cc is the block name that i gave when creating my own
cyclic_prefix block.
Can anyone help with your suggestions?
Thanks,
Simran Kaur
___
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
___
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
