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Re: [Discuss-gnuradio] gmsk+fec

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] gmsk+fec
Date: Sun, 27 Dec 2015 19:05:43 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0

Hi Ekko,
that screenshot is too small to tell anything significant. Could you
1. use the screenshotting function of GRC (File->Screen Capture) and
2. post the resulting PNG e.g. to imgur.com, but don't resize it.

Best regards,

On 12/27/2015 06:02 PM, Ekko wrote:
hello all
i have a simple GMSK modulation tx and rx chain in gnuradio.data is read from a file,and recieve demod into another file, this model works well

i would like to add convolutional encoding/decoding,and this is my grc,

​i got some problem

Using Volk machine: sse4_2_32
INFO: tried to set frame to 12000; max possible is 4096
INFO: cc_decoder: tried to set frame to 12000; max possible is 4096
FATAL: Missing a required length tag on port 0 at item #0
thread[thread-per-block[3]: <block fec_tagged_encoder (3)>]: Missing length tag.

i think that i am not using the fec in a correct way , so i want to ask is there someone who can give me some instruction about how to add a fec into gmsk,or how to use fec in gnuradio.

thank you 


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