PIC-based iterative SDR detector for OFDM systems in doubly-selective fading channels

  • Authors:
  • Shu Feng;Hlaing Minn;Liang Yan;Lu Jinhui

  • Affiliations:
  • Department of Communication Engineering, EEOT, Nanjing University of SCI and TECH, Nanjing, China and Department of Electrical Engineering, University of Texas at Dallas, Texas;Department of Electrical Engineering, University of Texas at Dallas, Texas;Department of Communication Engineering, EEOT, Nanjing University of SCI and TECH, Nanjing, China;Department of Communication Engineering, EEOT, Nanjing University of SCI and TECH, Nanjing, China

  • Venue:
  • IEEE Transactions on Wireless Communications
  • Year:
  • 2010

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Abstract

OFDM data detection in doubly-selective fading channels requires high complexity due to intercarrier interferences (ICI). We present a low-complexity receiver consisting of a semidefinite relaxation (SDR) based detector and parallel interference cancellation (PIC). The entire band is divided into clusters of adjacent subcarriers. SDR is applied on each cluster while PIC tackles ICI from other clusters. An upper bound of ICI power is derived and used to omit far-away clusters in performing PIC. Finally, an adaptive detector based on PIC, PIC-based SDR and the snap-shot SNR in channel is proposed to achieve a better tradeoff between complexity and performance.