[Discuss-gnuradio] embed fix sequence in payload part
From:
pratik hetamsaria
Subject:
[Discuss-gnuradio] embed fix sequence in payload part
Date:
Wed, 27 Jun 2007 22:04:18 +0100 (BST)
hi..
i am trying to embed a fixed sequence which i want to recover during demodulation. I have read from the previous archives that it would be easier to embed it in the payload part.However, as soon as i add anything in the payload part, and try to receive using rx_voice, i get an error saying
terminate called after throwing an instance of 'std::runtime_error' what(): msg length is not a multiple of d_itemsize Aborted (core dumped)
What I have understood is that the msg length changes as soon as I add something to the payload.If I dont do anything and just run rx_voice.py then the msg length comes to be 1687/1720
I have tried getting the msg length after adding different sequences. If i change the code as: payload = payload + preamble, the msg length changes to 1719
Otherwise, If i change as: payload = payload + default_access_code the msg length changes to 1751
where default_access_code and
preamble are given in packet_utils.py.
I have not been able to find out the value of d_itemsize or what should be its value so that the code runs.
I would be very grateful for any help.
Thanking you, Pratik Hetamsaria
Download prohibited? No problem. CHAT from any browser, without download.