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Re: matlab coodes for ldpc
Hi,
Maybe you can have a look on
http://www.kozintsev.net/soft.html
You can download igor's software for ldpc codes and matrix generation.
Everything is implemented under matlab.
I've checked matrix generation but not the decoder.
Good luck!
nonbinary ldpc
In fact I would like to talk about decoding.
I've implemented Progressive Edge Growth algorithm and use it for binary LDPC codes so i will use it for non binary LDPC codes for the moment.
I will have a look to better construction as soon as I will have a decoder.
But there...
Re: FEC Decoder
I think that FEC is applied on the Transport Stream and the RTP packet is generate with a specific payload type such that the receiver can recognize FEC RTP Packet.
Re: soft-decision decoding
Assume that the modulation is a BPSK and the transmission over an AWGN,
yhe LLR on GF(2^q) are then defined by :
\sum_{i=1}^{q} 2*y_i/sigma^2.
You can find this formula reading a paper on non binary LDPC codes, whose decoder needs LLR over GF(2^q).
Hope this will...
Re: soft-decision decoding
Hi,
with such DSP, the Koetter-Vardy algorithm is a real challenge!
When I work on it I implement the reliability Matrix with gaussian PDF as it is done by the authors. After, I used Koetter Algorithm for Interpolation and Roth Ruckenstein algorithm for...
convert orthogonal to orthonormal function
norm(u) is defined by <u,u> where <,> is a dot product and u a vector.
A norm depends on the dot product you chose to use.
What do you mean by "the benefits of the norm"?
orthogonal mean the same as orthonormal
Orthogonal mean that the dot product is null.
Orthonormal mean that the dot product is null and the norm is equal to 1.
If two or more vectors are orthonormal they are also orthogonal but the inverse is not true.
book ldpc over gf
Has anyone already worked on this topic?
I'm currently working on it and I would have enjoy to discuss about it with people who have already work on it.
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