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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Improved Wideband Precoding with Arbitrary Subcarrier Grouping in MIMO-OFDM Systems

  • Long, Hang (Wireless Signal Processing and Network Lab, Key Laboratory of Universal Wireless Communication, Ministry of Education, Beijing University of Posts & Telecommunications) ;
  • Kim, Kyeong-Jin (UWB Wireless Communications Research Center, Inha University) ;
  • Xiang, Wei (Faculty of Engineering and Surveying, University of Southern Queensland) ;
  • Shen, Shanshan (Wireless Signal Processing and Network Lab, Key Laboratory of Universal Wireless Communication, Ministry of Education, Beijing University of Posts & Telecommunications) ;
  • Zheng, Kan (Wireless Signal Processing and Network Lab, Key Laboratory of Universal Wireless Communication, Ministry of Education, Beijing University of Posts & Telecommunications) ;
  • Wang, Wenbo (Wireless Signal Processing and Network Lab, Key Laboratory of Universal Wireless Communication, Ministry of Education, Beijing University of Posts & Telecommunications)
  • Received : 2011.01.28
  • Accepted : 2011.06.23
  • Published : 2012.02.01
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Abstract

Precoding in the multiple-input multiple-output orthogonal frequency division multiplexing system is investigated. In conventional wideband precoding (WBP), only one precoder, obtained from the decomposition of the subcarrier independent channel matrix, is used for all subcarriers. With an investigation of the relationship between the subcarrier independent channel matrix and the temporal/frequency channels, an improved WBP scheme is proposed for practical scenarios in which a part of subcarriers are allocated to a user. The improved WBP scheme is a generalized scheme of which narrow-band precoding and conventional WBP schemes are special modes. Simulation results demonstrate that the improved WBP scheme almost achieves the optimum performance of a single precoder and outperforms the conventional WBP scheme in terms of the bit error ratio and ergodic capacity with slight complexity increase. The largest advantage of the improved WBP scheme on signal-to-noise ratio in simulation results is over 2.1 dB.

Keywords

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