hey,
i am having major problems here. i was testing some code i put into the
ldu1 files to get the unit ids. after many installations of the revised
ldu1 files my work was halted. first my grc got stuck on start up. now
it starts and dies in a flash and prints out like a thousand errors that
essentially, i think, say that op25 is not installed; or that it is
installed incorrectly.
i have been trying to remedy this all weekend. i uninstalled and
reinstalled op25 and gr-baz and grc3.6.3. multiple times. i am fresh out
of ideas. i attached the traceback stuff, if you can, please take a
peek. any guidance would be much appreciated.
--
Matt D
------------
Hey,
In the hdu.cc file there is a function 'apply_rs_correction'. I am
interested in finding out how this works. What is confusing me is that
I know it works. But I have been looking at this code and to me it
seems to do essentially nothing???
// apply a different kind of correction
void
hdu::apply_rs_correction(bit_vector& frame)
{
// pre-processor if statement that is *always false* (0 == false)
#if 0
*// so this code is not included in the final compiled program
static itpp::Reed_Solomon rs(6, 8, true);
const size_t rs_codeword[][6] = {
};
const size_t nof_codeword_bits = sizeof(codeword_bits) /
sizeof(codeword_bits[0]);
// the end of the pre-processor if statement
#endif
// and that's it for this function? -- so this function is actually
empty in the compiled program???
}
I am putting comments in the code trying to understand it. What am i
missing here?
--
Matt D
------------
Hey,
I am trying to get a handle on the data in the Link Control Word. The
LCW is 72 bits right? On transmission the 72 bit LCW is serialized into
12 hex bits. And then it is encoded with a (24,12,13) RS code to yield
24 hex bits. The 24 hex bits are then encoded with a (10,6,3) shortened
Hamming code to yield 240 bits total.
Is it known how the bits are serialized? Or better yet is there an
existing function for unserializing/serializing that will work here?
And the Hamming and RS codes: does anyone have functions for decoding
(10,6,3) Hamming and (24,12,13) RS code?
If these decoders do not exist already, where should I start?
Thanks!
--
Matt D
------------
Hey,
Does anyone know whats up with the LCFs??? There are only 2 examples in
the Daniels manual. I have been unable to find out anything about the
remaining LCFs.
Thanks
--
Matt D
------------
