Output of tx as input of rx

[Ghasem NaddafzadehShirazi]

Why do I get length(output_samps) = 1228800 in TX, although length(input_samps) for RX should be twice as much (307200x8=2457600)?

Thanks for your help in advance?

[Ghasem NaddafzadehShirazi]

I think I got my answer. We need at least 8 frames in RX. (why?)

[bwojtowi]

Ghasem,

You are correct, lte_fdd_dl_receive requires 8 frames of data in order to
proceed with processing. This was a limit that was put in place to cover
some worse case scenarios when decoding MIB fails a few times and then
decoding SIB1 fails a few times. When using with output from
lte_fdd_dl_transmit, the number of frames required can certainly be cut
down. This is a fairly easy modification to make on line 48 of
lte_fdd_dl_receive.

Hope this helps,
Ben

On Mon, Dec 2, 2013 at 1:56 PM, Ghasem NaddafzadehShirazi ghasemnaddaf@users.sf.net wrote:

I think I got my answer. We need at least 8 frames in RX. (why?)

Output of tx as input of rxhttps://sourceforge.net/p/openlte/discussion/general/thread/7efbf455/?limit=25#4bed

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[sethu]

Hi Ben,

Please clarify the following issue.

I have successfully generated bin files with LTE_fdd_dl_transmit.m file with the following parameters:

bandwidth = 15; % For all bandwidths, successfully generated .bin files.
N_frames = 10;
N_id_2 = 1;
N_id_1 = 10;
N_ant = 1;
mcc = 0091;
mnc = 040;
tac = 1;
cell_id = 1;
band = 10;%1

output_samps = lte_fdd_dl_transmit(bandwidth, N_frames, N_id_2, N_id_1, N_ant, mcc, mnc, tac, cell_id, band);

%lte_fdd_dl_receive(output_samps);

fd = fopen('signal_15_10.bin', 'w');
fdisp(fd,output_samps);
fclose(fd);

---

As mentioned, output of transmitter is input to receiver, as mentioned in code, given output_samps as input to lte_fdd_dl_receive(output_samps); but, SIB1 is getting successfully decoded for 10MHZ bandwidth; for rest of the bandwidths, either "SIB 1 PDCCH Not Found" or "Index exceeds matrix dimension" is getting received.

Kindly confirm why the lte_fdd_dl_receive.m file is successfully decode SIB1 for 10 MHz bandwidth and why not for other bandwidths? Kindly reply at your earliest convenience.

[bwojtowi]

Sethu,

I have not tested the octave code in a while. However, the last time I did
test it, it was able to decode SIB1 for all bandwidths. I'll have to take
a closer look to see if I can reproduce the issue.

Thanks for reporting this!
Ben

On Thu, Feb 13, 2014 at 12:25 AM, sethu sethu443@users.sf.net wrote:

Hi Ben,

Please clarify the following issue.
I have successfully generated bin files with LTE_fdd_dl_transmit.m file
with the following parameters:

bandwidth = 15; % For all bandwidths, successfully generated .bin files.
N_frames = 10;
N_id_2 = 1;
N_id_1 = 10;
N_ant = 1;
mcc = 0091;
mnc = 040;
tac = 1;
cell_id = 1;
band = 10;%1

output_samps = lte_fdd_dl_transmit(bandwidth, N_frames, N_id_2, N_id_1,
N_ant, mcc, mnc, tac, cell_id, band);

%lte_fdd_dl_receive(output_samps);

fd = fopen('signal_15_10.bin', 'w');
fdisp(fd,output_samps);
fclose(fd);

---

As mentioned, output of transmitter is input to receiver, as mentioned in
code, given output_samps as input to lte_fdd_dl_receive(output_samps); but,
SIB1 is getting successfully decoded for 10MHZ bandwidth; for rest of the
bandwidths, either "SIB 1 PDCCH Not Found" or "Index exceeds matrix
dimension" is getting received.

Kindly confirm why the lte_fdd_dl_receive.m file is successfully decode
SIB1 for 10 MHz bandwidth and why not for other bandwidths? Kindly reply at
your earliest convenience.

---

Output of tx as input of rxhttps://sourceforge.net/p/openlte/discussion/general/thread/7efbf455/?limit=25#7551

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[sethu]

Hi Ben,
Thanks for prompt response. I would like to make sure that the above mentioned scenario is an offline application. Generating samples in .bin files using lte_fdd_dl_transmit( ) and output samples is given as input to lte_fdd_dl_receive( ) call.

Please confirm whether any changes need to be made in files for different bandwidths. Also, could you please explain the testing scenario in your case. Thanks in advance.

Regards,
Sethu

[bwojtowi]

Sethu,

Sorry for the delayed response. I am able to reprocude the issue that you
are seeing. A fix for the bug will be included in the next release. In
order to continue your testing, here is a summation of the fix:
In lte_fdd_dl_transmit.m remove the following line:
480: N_pdcch_reg = N_pdcch_cce*9;
and add the following line:
516: pdcch_reg = zeros(N_ant, N_pdcch_reg, 4)

Thanks,
Ben

On Sun, Feb 16, 2014 at 11:57 PM, sethu sethu443@users.sf.net wrote:

Hi Ben,
Thanks for prompt response. I would like to make sure that the above
mentioned scenario is an offline application. Generating samples in .bin
files using lte_fdd_dl_transmit( ) and output samples is given as input to
lte_fdd_dl_receive( ) call.

Please confirm whether any changes need to be made in files for different
bandwidths. Also, could you please explain the testing scenario in your
case. Thanks in advance.

Regards,
Sethu

---

Output of tx as input of rxhttps://sourceforge.net/p/openlte/discussion/general/thread/7efbf455/?limit=25#7309

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