Hi Steve,
I running ofdm_mod and ofdm_demod demo with change fcentre, it works fine
with some change in ofdm_create function.
I want to increase number carrier (nc) to 37 (and without ldpc code) like
octave code. how to calculate Ts when nc = 30 ? I see in ofdm_lib.m
Ts=0.175/8.
And I change fcentre to 3000, so ofdm_demod run into error ? Can i using
fcentre = 3000 ? I want to using ofdm in PSTN network so bandwidth 400-3500.
My project is design duplex PSTN modem with bit rate 2400 and low SNR.
Thanks you.
Vào Th 2, 12 thg 11, 2018 vào lúc 21:44 Steve <coupaydevi...@gmail.com>
đã viết:
> My suggestion would be to disable it. It's not mandatory.
>
> On Mon, Nov 12, 2018 at 4:03 AM Đích Kiều <dich...@gmail.com> wrote:
>
>> Hi Steve,
>>
>> What about the center frequency of FIR filter, which initialized by
>> quisk_filt_cfInit? I see the default is 1500? How to change?
>>
>> Thanks, I tried to follow your way? But result in an error.
>>
>> Vào Th 6, 14 thg 9, 2018 vào lúc 14:10 Đích Kiều <dich...@gmail.com>
>> đã viết:
>>
>>> Thank you!
>>>
>>> Sent from my iPhone
>>>
>>> On Sep 14, 2018, at 11:49 AM, Steve <coupaydevi...@gmail.com> wrote:
>>>
>>> That's probably a good option to add. When I use OFDM on FM
>>> (experimentally), I move the frequency center left, to narrow the bandwidth.
>>>
>>> Look at ofdm_mod.c and add:
>>>
>>> if ((arg = opt_exists(argv, argc, "--fcentre"))) {
>>> ofdm_config->fcentre = atof(argv[arg+1]); /* Centre Frequency */
>>> } else {
>>> ofdm_config->fcentre = 1500.0;
>>> }
>>>
>>> probably the same in ofdm_demod.c
>>>
>>>
>>>
>>> On Thu, Sep 13, 2018 at 11:02 PM Đích Kiều <dich...@gmail.com> wrote:
>>>
>>>> Hi everyone, Hi David, Hi Bruce,
>>>>
>>>> I'm working in FreeDV on the old telephone network. I'm run into a
>>>> problem that I can't work with full-duplex because I think, due to the
>>>> hybrid circuit in the PSTN network. My solution is to adjust the center
>>>> frequency of the FreeDV 700D with different for TX (1000Hz) and RX
>>>> (2200Hz). I hope this help, I'm trying.
>>>>
>>>> I need some advice from all of you about that. If it's OK. How can I
>>>> adjust the center frequency of the FreeDV?
>>>>
>>>> P/ S: I can't use dial modem because I need fast sync.
>>>> Thanks very much.
>>>>
>>>> Email : dich...@gmail.com
>>>> SĐT : 0904736189
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>>>>
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>>>
>>
>> --
>>
>> *Kiều Việt Đích*
>> *Công ty 129 - Ban cơ yếu chính phủ*
>>
>> Email : dich...@gmail.com
>> SĐT : 0904736189
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Email : dich...@gmail.com
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