# Gr-lte **URL:** \ **Category:** GNU Radio\ **Created:** [December 11, 2013, 11:05am UTC](https://www.ruby-forum.com/t/gr-lte/238004 "2013-12-11T11:05:43Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Post date:** [December 11, 2013, 11:05am UTC](https://www.ruby-forum.com/t/gr-lte/238004/1 "2013-12-11T11:05:43Z")
Hi Johannes, I have compiled the gr-lte-gr37/gr37-lte branch successfully. Now I see a lot of python files and also grc-files in 37grc, but I dont’ now how can I start your LTE receiver application. I can generate the LTE signals and I would like to receive it with your LTE Receiver. Can you desribe me the test procedure? Which python files should I start for example? Thank you very much in advance for you answer! A.Baier ---
**Author:** ![Baier](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/77aa72/32.png) [@Baier](https://www.ruby-forum.com/u/Baier)\ **Post date:** [December 11, 2013, 5:48pm UTC](https://www.ruby-forum.com/t/gr-lte/238004/2 "2013-12-11T17:48:16Z")
Hi, In gr-lte/37grc are all the needed GRC flowgraphs. LTE\_flowgraph\_top\_level.grc is the one you eventually want to execute. When you first open ‘LTE\_flowgraph\_top\_level.grc’ probably most blocks are missing. This is because all the ‘hier blocks’ are not compiled yet. Just open the other flowgraphs. Click ‘Generate’ and ‘Reload’ and you get there. I know it is unhandy to do it this way. But having a lot of GRC ‘hier blocks’ and everything connected via GRC gives you a good overview of the flowgraph and all its different parts. And you can dig in to all the sub flowgraphs if you’re interested in how they work. Evnetually you feed the flowgraph your samples. These samples must be sampled at certain sampling rates. In the top\_level’ fg is a variable called ‘samp\_rate’ which tells you which sample rate the fg expects. This value depends on your chosen FFT size. And by choosing the FFT size you’re choosing the maximum number of subcarriers you can extract. I hope this helps. I know right now, the repo seems a little messy. As soon as I’m finished with all the blocks I want to move to GR 3.7 API I’ll clean it up. Happy hacking Johannes ---
**Author:** ![Baier](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/77aa72/32.png) [@Baier](https://www.ruby-forum.com/u/Baier)\ **Post date:** [March 27, 2014, 5:19am UTC](https://www.ruby-forum.com/t/gr-lte/238004/3 "2014-03-27T05:19:15Z")
i have installed gr-lte in gnuradio 3.7.2 .All hier blocks are generated and flow graph is complete upto unpack MIB.Is that it?.But when i run this i get following error Using Volk machine: sse4\_2\_32 pbch\_pre\_decoder\_vcvc\_1 set N\_ant to 2 pbch\_pre\_decoder\_vcvc\_1 set decoding style to “tx\_diversity” pbch\_pre\_decoder\_vcvc\_0 set N\_ant to 1 pbch\_pre\_decoder\_vcvc\_0 set decoding style to “tx\_diversity” pbch\_layer\_demapper\_vcvc\_1 set N\_ant to 2 pbch\_layer\_demapper\_vcvc\_1 set decoding style to “tx\_diversity” pbch\_layer\_demapper\_vcvc\_0 set N\_ant to 1 pbch\_layer\_demapper\_vcvc\_0 set decoding style to “tx\_diversity” RS GENERATOR cell\_id pilots 1 RS GENERATOR cell\_id pilots 0 Traceback (most recent call last): File “/home/cdot/top\_block.py”, line 218, in tb = top\_block(N\_rb\_dl\_0=options.N\_rb\_dl\_0) File “/home/cdot/top\_block.py”, line 92, in **init** self.decode\_bch\_hier\_gr37\_0 = decode\_bch\_hier\_gr37() File “/root/.grc\_gnuradio/decode\_bch\_hier\_gr37.py”, line 46, in **init** self.bch\_lte\_bch\_viterbi\_vfvb\_0 = lte.bch\_viterbi\_vfvb() File “/usr/local/lib/python2.7/dist-packages/lte/bch\_viterbi\_vfvb.py”, line 42, in **init** self.vtss = blocks.vector\_to\_streams(1\* gr.sizeof\_float, 120, “bch\_viterbi\_vector\_to\_streams\_0”) File “/usr/local/lib/python2.7/dist-packages/gnuradio/blocks/blocks\_swig1.py”, line 369, in make return \_blocks\_swig1.vector\_to\_streams\_make(\*args, \*\*kwargs) TypeError: vector\_to\_streams\_make() takes at most 2 arguments (3 given)