3GPP Interleaver

• Turbo internal interleaver is block interleaver

  • re-orders data within a block

• Interleaver implemented as address sequence generator

  • Read or write memories in interleaved or non-interleaved order
  • Data stored in memories in non-interleaved order

• 3GPP interleaver block sizes vary from 40 to 5114 bits

  • All block sizes have different interleaver

• Most hardware implementations are look-up tables

  • Require large memory: 5k ? 13
  • Require processor to generate memory data

• Altera has developed algorithmic 3GPP interleaver

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