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Iterative Detection and ICI Cancellation for MISO-mode DVB-T2 System with Dual Carrier Frequency Offsets

  • Jeon, Eun-Sung (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Seo, Jeong-Wook (Advanced Mobile Technology Research Center, Korea Electronic Technology Institute) ;
  • Yang, Jang-Hoon (Department of Newmedia, Korea German Institute of Technology) ;
  • Paik, Jong-Ho (Multimedia Department, Seoul Women's University) ;
  • Kim, Dong-Ku (Department of Electrical and Electronic Engineering, Yonsei University)
  • Received : 2011.10.11
  • Accepted : 2012.01.27
  • Published : 2012.02.28

Abstract

In the DVB-T2 system with a multiple-input single-output (MISO) transmission mode, Alamouti coded orthogonal frequency division multiplexing (OFDM) signals are transmitted simultaneously from two spatially separated transmitters in a single frequency network (SFN). In such systems, each transmit-receive link may have a distinct carrier frequency offset (CFO) due to the Doppler shift and/or frequency mismatch between the local oscillators. Thus, the received signal experiences dual CFOs. This not only causes dual phase errors in desired data but also introduces inter-carrier interference (ICI), which cannot be removed completely by simply performing a CFO compensation. To overcome this problem, this paper proposes an iterative detection with dual phase errors compensation technique. In addition, we propose a successive-iterative ICI cancellation technique. This technique successively eliminates ICI in the initial iteration by exploiting pre-detected data pairs. Then, in subsequent iterations, it performs a fine interference cancellation using a priori information, iteratively fed back from the channel decoder. In contrast to previous works, the proposed techniques do not require estimates of dual CFOs. Their performances are evaluated via a full DVB-T2 simulator. Simulation results show that the DVB-T2 receiver equipped with the proposed dual phase errors compensation and the successive-iterative ICI cancellation techniques achieves almost the same performance as ideal dual CFOs-free systems, even for large dual CFOs.

Keywords

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