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RS Encoder VHDL Source Code

vhdl reed-solomon rs encoder source code encoder

In the WiMAX physical layer (especially the OFDM mode, like IEEE 802.16d), the Reed-Solomon (RS) encoder is used as part of the forward error correction (FEC) system to protect transmitted data against errors caused by noise, fading, and interference during wireless transmission.

RS Encoder (Reed-Solomon)

  • The RS encoder works by adding redundant (parity) symbols to the original data symbols.
  • This way, even if some parts of the transmitted signal are lost or corrupted, the receiver can detect and correct multiple symbol errors without needing retransmission.
  • This is particularly important in WiMAX because wireless channels can suffer from burst errors.

Specifications of RS Encoder in WiMAX

  • RS(255, 239, 8) over GF(2^8) Where,
    • 255 total symbols
    • 239 information symbols
    • 16 parity symbols
    • Can correct up to 8 symbol errors.

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Summary

The RS encoder in WiMAX OFDM adds redundancy to data to detect and correct multiple symbol errors, ensuring more reliable communication over unreliable wireless channels.