Soft-input soft-output lattice sphere decoder for linear channels

Joseph Boutros, Nicolas Gresset, Loïc Brunel, Marc Fossorier

Research output: Contribution to conferencePaper

101 Citations (Scopus)


Soft output detection for signals transmitted on linear channels is investigated. A particular emphasis is made for signal detection on multiple antenna channels. The a posteriori information at the detector output is evaluated from a shifted spherical list of point candidates. The spherical list is centered on the maximum likelihood point, which has the great advantage of stabilizing the list size. Thus, the sphere radius is selected in order to control the list size and to cope with the boundaries of the finite multiple antenna constellation. Our new soft output sphere decoder is then applied to the computation of constrained channel capacity and to the iterative detection of a coded transmission. For example, we achieved a signal-to-noise ratio at 1.25dB from capacity limit on a 4 × 4 MEMO channel with 16-QAM modulation and a 4-state rate 1/2 parallel turbo code.

Original languageEnglish
Number of pages5
Publication statusPublished - 1 Dec 2003
Externally publishedYes
EventIEEE Global Telecommunications Conference GLOBECOM'03 - San Francisco, CA, United States
Duration: 1 Dec 20035 Dec 2003


OtherIEEE Global Telecommunications Conference GLOBECOM'03
CountryUnited States
CitySan Francisco, CA


ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Global and Planetary Change

Cite this

Boutros, J., Gresset, N., Brunel, L., & Fossorier, M. (2003). Soft-input soft-output lattice sphere decoder for linear channels. 1583-1587. Paper presented at IEEE Global Telecommunications Conference GLOBECOM'03, San Francisco, CA, United States.