Next Article in Journal
On the Accessibility of Newton’s Method under a Hölder Condition on the First Derivative
Previous Article in Journal
Conditional Random Fields for Pattern Recognition Applied to Structured Data
Article Menu

Export Article

Open AccessArticle
Algorithms 2015, 8(3), 484-513; doi:10.3390/a8030484

Multi-Feedback Interference Cancellation Algorithms for OFDM Systems over Doubly-Selective Channels

1,2,* , 3
,
4,* and 1,2
1
College of Electronic and Information Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing 210044, China
2
Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology (CICAEET), Nanjing 210044, China
3
College of Information Science and Technology, Hainan University, Haikou 570228, China
4
School of Communication Engineering, Chengdu University of Information Technology, Chengdu 610225, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Evangelos Kranakis
Received: 28 May 2015 / Revised: 2 July 2015 / Accepted: 8 July 2015 / Published: 14 July 2015
View Full-Text   |   Download PDF [412 KB, uploaded 14 July 2015]   |  

Abstract

Orthogonal frequency-division multiplexing (OFDM) systems over rapidly time varying channels may suffer from significant inter-carrier interference (ICI), which destroys the orthogonality between subcarriers and degrades the detection performance. Without sufficient ICI suppression, OFDM systems usually experience an error floor. According to the approximate matched filter bound (AMFB), the error floor in a coded OFDM system is not irreducible. In this work, we introduce novel multiple feedback matched filter (MBMF)-based ICI cancellation receivers. Based on the output of a novel MBMF scheme, the approach employs a multiple ICI cancellation strategy with or without signal-to-interference-plus-noise-ratio (SINR) ordering. The developed schemes can significantly improve the performance and remove the error floor with a negligible complexity increase. Given the multiple cancellation approach, we compare the SINR performance of the MBMF outputs with that employing single feedback and show that the SINR performance with multiple cancellation candidates is improved over that with a single one at practical SNR values. Additionally, for time-varying channels, we exploit partial fast Fourier transform (PFFT) by splitting one OFDM symbol into multiple segments; the channel state is separately estimated by least-squares (LS) methods without inserting more pilots. Simulation results demonstrate the superiority of the proposed methods over serial and block equalizers and the robustness to the Doppler effects compared to conventional single-segment method. View Full-Text
Keywords: interference cancellation; OFDM; doubly-selective channels interference cancellation; OFDM; doubly-selective channels
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Li, P.; Chen, M.; Li, L.A.; Feng, J. Multi-Feedback Interference Cancellation Algorithms for OFDM Systems over Doubly-Selective Channels. Algorithms 2015, 8, 484-513.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Algorithms EISSN 1999-4893 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top