Can someone explain what 'coding rate' is?

Question

In simple, easy to understand terms can someone explain what coding rate means in a wireless communication system please! :-) THANKS!

Answer 1

The code rate or information rate[1] of a forward error correction (FEC) code, for example a convolutional code, states what portion of the total amount of information that is useful (non redundant). The code rate is typically a fractional number. If the code rate is k/n, for every k bits of useful information, the coder generates totally n bits of data, of which n-k are redundant.

If R is the gross bitrate or data signalling rate (inclusive of redundant error coding), the net bitrate (the useful bit rate exclusive of error-correction codes) is ≤ R•k/n.

For example: The code rate of a convolutional code may typically be 1/2, 2/3, 3/4, 5/6, 7/8, etc, corresponding to that one redundant bit is inserted after every single, second, third, etc, bit. The code rate of the Reed Solomon block code denoted RS(204,188) is 188/204, corresponding to that 204 - 188 = 16 redundant bytes are added to each block of 188 byte of useful information.

A few error correction codes do not have a fixed code rate -- rateless erasure codes.

Note that bit/s is a more widespread unit of measurement for the information rate, implying that it is synonymous to net bit rate or useful bit rate exclusive of error-correction codes.

Answer 2

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Answer 3

You probably mean code rate. In wireless and other communication, extra data is transmitted to aid in correcting errors. Code rate refers to either



1, The amount of real data, excluding error correction data, sent per second,

2. The ratio of real data to total data.