Error Correction Coding (ECC, FEC) - definition
Error Correction Coding (ECC, FEC) - definition
error correction coding (ECC; forward error correction, FEC) is a processing technique used in information transmission and storage systems to detect and self-correct errors occurring as a result of interference, noise or damage to the transmission medium. It involves adding additional control bits to the usage data, generated according to a specific mathematical algorithm, which enables the receiver to identify and correct erroneously received information without the need for retransmission.
Corrective coding is a key component of digital systems, especially where it is impossible or expensive to retransmit data - as in satellite links, streaming, wireless networks, Mass Storage or integrated circuits. The most commonly used codes are block codes (e.g. Hamming, BCH, Reed-Solomon codes) as well as splicing and turbo codes, which allow high correction efficiency with relatively little redundancy overhead. Low-Density Parity-Check (LDPC) codes and polar codes, known for their high performance close to the Shannon limit, are also used in modern telecommunications systems.
In practice, FEC coding takes place at the transmitting side, where the data is transformed into a coded string and then transmitted over the channel. The receiver, based on the code structure and decoding rules, analyses the received signal and reconstructs the original data, even in the presence of errors. The effectiveness of the correction depends on the strength of the code (the number of errors detected and corrected), the length of the codeword and the decoding algorithm.
Corrective coding underpins the reliability of digital information transmission and storage, ensuring the integrity of data and making systems more resilient to interference. Its implementation requires knowledge of information theory, linear algebra and numerical algorithms, and the selection of a particular code depends on the characteristics of the channel, the required throughputand the level of error protection.
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