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[SOLVED] Question about coding rate?

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pink2011

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Hi all,

I am a begginer in digital communication. and i have one question !

Since coding rate of 3/4 gives triple data throughput in comparison with a coding rate of 1/4,

why would a coding rate of 1/4 ever be used?:???:


Thank you in advance.
 

why would a coding rate of 1/4 ever be used?
Click to expand...

who used it? This is a very low bandwidth-efficient coding scheme
 

David83 said:
who used it? This is a very low bandwidth-efficient coding scheme
Click to expand...

Thank you David for replying . . .

Yeah it is very low bandwidth-efficient coding scheme, but the question is why it is used although it has low bandwidth ?


Thank u
 

Some wireless systems even use a 1/5 coding rate, you compromise throughput with robustness to errors, 3/4 rate will have higher bit error rate than 1/4
 
most systems with Turbo codes like LTE, DVB, MediaFLO...etc
 

There is only one reason to use such a low coding rate FEC, i.e. better BER. However, in some cases, lower coding rate doesn't mean better BER. This is all depends on how you design your FEC.
 
Thank you for answering my question, *very informative to me*


Thank you once again
 

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