On statistical properties of co-channel interference in OFDM systems

Cheng Feng, Hongyu Cui, Meng Ma, Bingli Jiao

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Co-channel interference is a key problem in orthogonal frequency division multiplexing (OFDM) wireless communication systems. Channel coding is an effective means of combating the interference. In order to achieve a good decoding performance, the accurate interference distribution should be known at receiver. In most of the previous studies, the co-channel interference was usually modeled as a Gaussian random variable, however, was found to be inaccurate for OFDM cellular systems recently in few works. In this paper, we study the statistic properties of co-channel interference in wireless OFDM systems. By using Monte Carlo simulation and curve-fitting, non-Gaussian distributions are found to be more accurate than the Gaussian distribution. Based on the derived interference distributions, the log-likelihood ratio (LLR) in a maximum a posteriori (MAP) decoder is calculated to enhance the error correction ability. Simulation results show that a dramatic performance gain can be achieved by using the derived interference distributions compared to the conventional decoder using the Gaussian model.

Original languageEnglish
Article number6646518
Pages (from-to)2328-2331
Number of pages4
JournalIEEE Communications Letters
Volume17
Issue number12
DOIs
StatePublished - Dec 2013
Externally publishedYes

Keywords

  • Co-channel interference
  • decoding
  • orthogonal frequency division multiplexing (OFDM)

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