Low-power hybrid turbo decoding based on reverse calculation

Hye Mi Choi, Ji Hoon Kim, In Cheol Park

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


As turbo decoding is a highly memory-intensive algorithm consuming large power, a major issue to be solved in practical implementation is to reduce power consumption. This paper presents an efficient reverse calculation method to lower the power consumption by reducing the number of memory accesses required in turbo decoding. The reverse calculation method is proposed for the Max-log-MAP algorithm, and it is combined with a scaling technique to achieve a new decoding algorithm, called hybrid log-MAP, that results in a similar BER performance to the log-MAP algorithm. For the W-CDMA standard, experimental results show that 80% of memory accesses are reduced through the proposed reverse calculation method. A hybrid log-MAP turbo decoder based on the proposed reverse calculation reduces power consumption and memory size by 34.4% and 39.2%, respectively.

Original languageEnglish
Pages (from-to)782-789
Number of pages8
JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Issue number3
StatePublished - 2006


  • Log-MAP algorithm
  • Low-power design
  • Max-log-MAP algorithm
  • Reverse calculation
  • Turbo codes
  • Turbo coding
  • Turbo decoding


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