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Repeat-Accumulate (RA) codes are a class of error-correcting codes used in digital communications and data storage that effectively combine two coding techniques: repetition coding and accumulation. They are known for their performance in environments with noise and interference, particularly in scenarios requiring reliable data transmission. ### Structure of Repeat-Accumulate Codes: 1. **Repetition Coding**: The basic idea of repetition coding is to repeat each bit of the data multiple times.

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  1. Error detection and correction
  2. Algorithms
  3. Applied mathematics
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