Soft-in soft-out detection using partial Gaussian approximation

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

6 Scopus Citations
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Author(s)

  • Qinghua Guo
  • Defeng Huang
  • Sven Nordholm
  • Jiangtao Xi
  • Li Ping

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number6810827
Pages (from-to)427-436
Journal / PublicationIEEE Access
Volume2
Publication statusPublished - 2014

Abstract

This paper concerns the soft-in soft-out detection in a coded communication system, where the transmitted symbols are discrete valued, and the exact a posteriori probability (APP) detection often involves prohibitive complexity. By using the properties of Gaussian functions, an approximate approach to the APP detection is devised with the idea that, in the computation of the APP of each symbol, the remaining symbols are distinguished based on their contributions to the APP of the concerned symbol, and the symbols with less contributions are approximated as (continuous) Gaussian variables [hence the name partial Gaussian approximation (PGA)] to reduce the computational complexity. The connection between the PGA detector and the reduced dimension maximum a posteriori detector (RDMAP) is investigated. It is shown that, PGA is equivalent to RDMAP, but it has a complexity much lower than that of RDMAP, i.e., PGA can be regarded as an efficient implementation of RDMAP. In addition, the application of PGA in intersymbol interference (ISI) channel equalization is also investigated. We show that PGA allows further significant complexity reduction by exploiting the circulant structure of the system transfer matrix, which makes PGA very attractive in handling severe ISI channels with large memory length.

Research Area(s)

  • Gaussian functions, LMMSE detection, RDMAP, Soft-in soft-out detection, Turbo equalization

Citation Format(s)

Soft-in soft-out detection using partial Gaussian approximation. / Guo, Qinghua; Huang, Defeng; Nordholm, Sven; Xi, Jiangtao; Ping, Li.

In: IEEE Access, Vol. 2, 6810827, 2014, p. 427-436.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review