New Iterative Frequency-Domain Detectors for IA-Precoded MC-CDMA Systems

Adão Silva, José Assunção, Rui Dinis, Atílio Gameiro, Peter Farkas

Research output: Contribution to journalArticle

Abstract

The aim of this paper is to design new multi-user receivers based on the iterative block decision feedback equalization concept for MC-CDMA systems with closed-form interference alignment (IA) at the transmitted side. IA is a promising technique that allows high capacity gains in interfering channels. On the other hand, iterative frequency-domain detection receivers based on the IB-DFE concept can efficiently exploit the inherent space-frequency diversity of the MIMO MC-CDMA systems. In IA-precoded based systems the spatial streams are usually separated by using a standard linear MMSE equalizer. However, for MC-CDMA based systems, linear equalization is not the most efficient way of separating spatial streams due to the residual inter-carrier interference (ICI). Therefore, we design new non-linear iterative receiver structures to efficiently remove the aligned interference and separate the spatial streams in presence of residual ICI. Two strategies are considered: in the first one the equalizer matrices are obtained by minimizing the mean square error (MSE) of each individual data stream at each subcarrier, while in the second approach the matrices are computed by minimizing the overall MSE of all data streams at each subcarrier. We also propose an accurate analytical approach for obtaining the performance of the proposed receivers. Our schemes achieve the maximum degrees of freedom provided by the IA precoding, while allowing close-to-optimum space-diversity gain, with performance approaching the matched filter bound.

Original languageEnglish
Pages (from-to)1183-1199
Number of pages17
JournalWireless Personal Communications
Volume86
Issue number3
DOIs
Publication statusPublished - 1 Feb 2016

Fingerprint

Code division multiple access
Detectors
Equalizers
Mean square error
Decision feedback equalizers
Matched filters
MIMO systems
Feedback

Keywords

  • Frequency-domain equalization
  • Interference alignment
  • MC-CDMA
  • Non-linear equalizers

Cite this

Silva, Adão ; Assunção, José ; Dinis, Rui ; Gameiro, Atílio ; Farkas, Peter. / New Iterative Frequency-Domain Detectors for IA-Precoded MC-CDMA Systems. In: Wireless Personal Communications. 2016 ; Vol. 86, No. 3. pp. 1183-1199.
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New Iterative Frequency-Domain Detectors for IA-Precoded MC-CDMA Systems. / Silva, Adão; Assunção, José; Dinis, Rui; Gameiro, Atílio; Farkas, Peter.

In: Wireless Personal Communications, Vol. 86, No. 3, 01.02.2016, p. 1183-1199.

Research output: Contribution to journalArticle

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AU - Silva, Adão

AU - Assunção, José

AU - Dinis, Rui

AU - Gameiro, Atílio

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