max-logMAP Decoder

• Turbo decoder requires soft-in / soft-out decoder

• Candidate algorithms are

  • Soft Output Viterbi Algorithm (SOVA)
  • Maximal A-Posteriori (MAP)

• MAP has superior performance

  • Works with 0.8dB to 1.3dB lower signal to noise ration (SNR)

• MAP is larger (requires large alpha matrix memory)

• logMAP is MAP in logarithmic domain (avoid ? and ?)

• max-logMAP is simplification of logMAP

  • Approximately 0.3dB poorer performance
  • Difference reduces with mis-matched channel estimation

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