• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
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Volume 20 Issue 5
Oct.  2007
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Article Contents
LIU Hongwu, FENG Quanyuan. Post-IDFT Multidimensional Beamforming for STC-OFDM Systems[J]. Journal of Southwest Jiaotong University, 2007, 20(5): 604-610.
Citation: LIU Hongwu, FENG Quanyuan. Post-IDFT Multidimensional Beamforming for STC-OFDM Systems[J]. Journal of Southwest Jiaotong University, 2007, 20(5): 604-610.

Post-IDFT Multidimensional Beamforming for STC-OFDM Systems

  • Received Date: 29 Jun 2006
  • Publish Date: 25 Oct 2007
  • A post-inverse discrete Fourier transform(post-IDFT) multidimensional beamforming scheme was proposed for space-time coded-orthogonal frequency division multiplexing(STC-OFDM) systems.This scheme obtains multiple eigen mode by decomposing cross-matrix of space-frequency channels,and forms multidimensional post-IDFT beamformings for STC-OFDM systems based on the orthogonality of the STBC transmission matrix.The space-diversity gain achieved by the scheme is the sum of the multiple eigen values,and is the same as that of the sub-carrier beamforming,with a lower symbol error rate(SER) than a STC-OFDM does.The proposed scheme reduces the complexity to 1/S(S is the number of subcarriers of an OFDM system) compared with the sub-carrier beamforming;moreover,when the dimension of the post-IDFT beamforming(m) is less than the number of the transmit antennas(M),the system reduces M-m IDFT blocks.

     

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