Re: [Discuss-gnuradio] gr-lte updated to GNU Radio 3.7 API

[Mike Cornelius]

Hi Johannes,

I gave this a try today so I thought I'd pass on my results:-

Firstly, I found that I could not 'import lte' as sync_cc.py could not import 'window' from gnuradio.

I 'fixed' that by changing sync_cc.py as follows:-

self.pfft = fft.fft_vcc(fftl, True, window.rectangular(fftl), False, 1)

to

self.pfft = fft.fft_vcc(fftl, True, fft.window.rectangular(fftl), False, 1)

Now when I run it with my reference waveform I see:-

--------------------------------------------------------------------------------

Press Enter to quit: 

pss_calculator_vcm NEW half_frame_start = -13166 N_id_2 = 0 corr_val = 27512.798828

pss_calculator_vcm NEW half_frame_start = -8784 N_id_2 = 2 corr_val = 30075.925781

pss_calculator_vcm NEW half_frame_start = 13187 N_id_2 = 0 corr_val = 33294.562500

sync_frequency_c ASYNC! new offset = 6611 old offset = 0 samp_num = 5910

pss_calculator_vcm NEW half_frame_start = 21971 N_id_2 = 1 corr_val = 35808.539062

sync_frequency_c ASYNC! new offset = 13187 old offset = 6611 samp_num = 5899

pss_calculator_vcm NEW half_frame_start = 43907 N_id_2 = 0 corr_val = 36685.992188

sync_frequency_c ASYNC! new offset = 15 old offset = 13187 samp_num = 15027

pss_calculator_vcm is locked! half_frame_start = 61455 N_id_2 = 0 corr_val = 36685.992188

sync_frequency_c ASYNC! new offset = 16 old offset = 15 samp_num = 12763

sss_calculator_vcm locked to frame_start = 215056 abs_pos = 1751056 cell_id = 132

sss_calculator_vcm publish_frame_start 215056

sss_calculator_vcm publish_cell_id 132

<bound method block_gateway_sptr.block__name of <block_gateway>> received cell_id = 132

 <bound method block_gateway_sptr.block__name of <block_gateway>>  cell_id =  cell_id =  132 132  generating RS map!

received cell_id = 132

  generating RS map!

remove_cp_cvc

frame_start = 1751056

mod start   = 215056

Segmentation fault

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I'm not certain whether CID 132 is correct for this waveform so it's hard to say whether it's working up to the seg fault or not.

Regards,

Mike

On 15 December 2013 10:34, Johannes Demel <address@hidden> wrote:

Hello GNU Radio enthusiasts,

some time after the GNU Radio 3.7 release I started to move the code for
'gr-lte' to the new API. Besides moving it to the new API, I wanted to
clean up code and rework a lot of tests. Thus, the whole transition took
a lot of time and work.
Now, all current blocks are moved to the GNU Radio 3.7 API with lots of
enhancements. e.g. I tried to remove all hierarchical python blocks and
created them as GRC hier blocks instead. Or runtime status events, like
cell_id extraction, are all propagated through message ports now.
Also, there is a PyBOMBS recipe now to ease the installation process.

I hope 'gr-lte' can be useful for others.

Source code is available at https://github.com/kit-cel/gr-lte

Happy hacking
Johannes

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