Hello,
I have acoustic modem which uses ALSA source as interface to outside world. I
use a preamble based time synchronization technique to find start of data in
the frame. But my synchronization method is taking too long and in the process
i think i am loosing incoming samples from ALSA sour
io] gr-trellis : problem in using viterbi decoder
To: "Raman O" , discuss-gnuradio@gnu.org
Date: Tuesday, 20 July, 2010, 1:55 AM
you will have to make the constellation a 2D array (essentially representing
the 2 BPSK symbols).
It is all explained in the examples and the documentation of gr-tre
sing generator poly in
awgn1o2_128.fsm.
Many many thanks,
Ram
--- On Mon, 19/7/10, Achilleas Anastasopoulos wrote:
From: Achilleas Anastasopoulos
Subject: Re: [Discuss-gnuradio] gr-trellis : problem in using viterbi decoder
To: "Raman O" , discuss-gnuradio@gnu.org
Date: Monday, 19 July,
Hello Achilleas,
Thanks for your response.
I have connected encoder block , it disappeared during editing mail by mistake.
Input is in the form of an array of size K and vector2stream feeds encoder bit
a time ,so i am using following syntax :
gr_vector_source_s_sptr bit_src = gr_make_vector_so
Hello ,
I am using conv encoder and viterbi decoder in FHSS-BPSK transceiver.
Below I have pasted encoder-decoder code which is a part of pure C++
application. Problem is encoder input and decoder output do not match.
Can anyone point where i am making mistake ?
Thanks in advance
Ram
Hello,
I have built a receiver with alsa source. I think without buffering ,
fast audio source is drowning the receiver blocks as they are slower.
How can I buffer the data from alsa source and rest of receiver blocks
like bandpass filter , time sync , data decoder operate on buffered
hello ,
I have implemented receiver for detecting and decoding data frame based
FHSS. At the moment, I am feeding Rx with recorded wav file and it works fine.
The problem is when i want to do online decoding by replacing wav source with
alsa source, I see nothing happening beyond frame sync.
Hello,
I am implementing transceiver based on acoustic waves. Now I have started
with receiver. Input to the receiver is from audio_alsa_source. I have written
a block named packet_detect based on sync_decimator to accept samples from
alsa_source.
Within the packet_detect block , I have bee
