Comparison of forward-only and bi-directional fixed-lag adaptive SISOs

Jun Heo, Keith M. Chugg, Achilleas Anastasopoulos

Research output: Contribution to conferencePaperpeer-review

9 Citations (Scopus)


Several structures for fixed-lag (FL) soft-in/soft-out (SISO) algorithms in the case of a perfectly known channel are well-known. These forward-only and bi-directional fixed-lag SISOs have recently been described with the bi-directional version shown to be preferred. Adaptive iterative detection using adaptive SISOs (A-SISOs) have also recently been demonstrated to provide significant performance gains for time-varying channels. However, these impressive results have been obtained with fixed-interval, bi-directional A-SISOs and training signals at both ends of the data packet. We combine these recent results to develop and compare various adaptive, fixed-lag SISOs. Among several reasonable options considered, the preferred A-SISO algorithm is found to be bi-directional with forward-only channel estimation.

Original languageEnglish
Number of pages5
Publication statusPublished - 2000
Externally publishedYes
Event2000 IEEE International Conference on Communications - New Orleans, LA, USA
Duration: 2000 Jun 182000 Jun 22


Other2000 IEEE International Conference on Communications
CityNew Orleans, LA, USA

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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