Widely linear MMSE precoding and equalization techniques for SC-FDE systems

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• 作者：Bruno S Chang (4)
  Carlos AF da Rocha (5)
  Didier Le Ruyet (6)
  Daniel Roviras (6)
  
  4. Electronics Department ; Federal University of Technology - Paran谩 ; Curitiba ; 80230-901 ; Brazil
  5. Communications Research Group ; Federal University of Santa Catarina ; Florian贸polis ; 88040-900 ; Brazil
  6. CEDRIC/LAETITIA Laboratory ; Conservatoire National des Arts et M茅tiers ; 75141 ; Paris C茅dex 03 ; France
  
• 关键词：SC ; FDE ; Widely linear processing ; Equalization ; Tomlinson ; Harashima precoding
• 刊名：EURASIP Journal on Advances in Signal Processing
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：2014
• 期：1
• 全文大小：1,314 KB
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• 刊物主题：Signal, Image and Speech Processing;
• 出版者：Springer International Publishing
• ISSN：1687-6180

文摘

Single-carrier systems using frequency-domain equalization (SC-FDE) systems were proposed to overcome the low robustness to carrier frequency offset (CFO) and high peak-to-average-power ratio (PAPR) inherent to regular orthogonal frequency-division multiplexing (OFDM) systems. Usually, linear minimum mean square error (MMSE) equalization is used to compensate the channel effect, since maximum likelihood (ML) detection is computationally impractical. However, if the transmitted signal comes from an improper constellation, widely linear processing can be used to take advantage of all the available second-order statistics from this transmitted signal, obtaining this way a performance gain when compared to the strictly linear case. In this paper, a SC-FDE system employing widely linear MMSE equalization is proposed in its regular and decision-feedback (DFE) versions. A SC-FDE system employing widely linear MMSE Tomlinson-Harashima precoding (THP) and equalization is also proposed. With Tomlinson-Harashima precoding, the error propagation problem observed in systems using a decision-feedback equalizer vanishes, because the feedback processing is done at the transmitter. Simulation results show that together with the error performance gain, these systems have lower sensibility to the feedback filter length in systems using decision-feedback equalizers. In Tomlinson-Harashima precoded systems, the performance gain is observed even with channel estimation/channel state information errors.