Re: Empty file at File Sink for BPSK mod&demod simulation

[Grace Huang]

Hi Jeff,

Thank you for the replies.

Do you mean that the sample rate for RRC taps should be 32 instead of nfilts? I've set nfilts as a variable with the value of 32. 

Regarding the deprecated packet encoder block, I've searched up a bit but could not find much information on replacing the block. Came across this: https://dsp.stackexchange.com/questions/56163/gnu-radio-packet-encoder-decoder-unwanted-bytes-added-to-the-transmitted-str

but I downloaded the binary installers for GNURadio on windows and can't find the example flowgraphs stated. Is there any way to access these flow graphs or any examples on going about doing the encoding and decoding?

Thank you.

Grace

On Wed, Jun 24, 2020 at 9:19 PM Jeff Long <willcode4@gmail.com> wrote:

... and the packet encoder block has been removed "after long deprecation" according to the Changelog.

On Wed, Jun 24, 2020 at 9:10 AM Jeff Long <willcode4@gmail.com> wrote:

The RRC taps have a sample rate of 32 and the grc file shows samp_rate set to nfilts.

On Wed, Jun 24, 2020 at 6:38 AM Grace Huang <gracehuang1999@gmail.com> wrote:

Hi all,

I'm trying to pass a text file through with a simulated channel model modulated with BPSK. I'm having an issue with not getting any data written on to the text file at the file sink. 

I passed a txt file in with file source block, followed by packet encoder then modulate it with BPSK before passing through the channel model. After that, I used polyphase clock sync, CMA equalizer and costa loop to minimise frequency, noise and time offset and distortion. Finally I proceeded to use constellation decoder, differential decoder, unpack K bits and packet decoder before passing it to file sink.

The exact flow graph can be found on GitHub here: https://github.com/wei1006/HAB

Are there steps that I've missed out or done wrongly?

Please advise

Thank you,

Grace