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jiakejunlv
Joined: 17 May 2006
Posts: 4
Helped: 1
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 31 May 2006 5:12 Ldpc code discuss |
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hellow guy:
i learn the LDPC code recently, i have accomplished the encode and decode ,but i don not know the relationship of BER and SNR ,how can i define this relationship?
help me
qq:395044780 Email: jiakejunlv(at)126.com
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davyzhu
Joined: 23 May 2004
Posts: 521
Helped: 3
Location: oriental
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| 31 May 2006 7:30 Ldpc code discuss |
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Hello guy,
If you want to do simulation, encoder and decoder is not enough. You have to add AWGN noise based on your SNR setting to emulate the channel effect. And when you decode the bit stream, your program will calculate how many bit can not be correcting to right(i.e. what you transmit from encoder).
The SNR defination: 10*log(powerOfSignal/powerOfNoise)
If you are familiar with C, you would like to run the FAMOUS neal's LDPC program. And you may modify it as you like.
http://www.cs.toronto.edu/~radford/ftp/LDPC-2006-02-08/index.html
Another Chinese
Davy
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khaldoon99
Joined: 13 Dec 2005
Posts: 20
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| 01 Jun 2006 19:23 Ldpc code discuss |
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Hi
SNR (signal to noise ratio) is a number determinates the amount of noise that you will apply on a channel or a series of bits ,so you must apply a noise (AWGN) then you will compare the bit errors with the Shanon limit to determinate the power of algorithm.
BER: in the receiption you can calculate the number of bit errors (any way).
the relation is nonlinear and can't described by a mathematical eqaution.
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