| Spacetime coded eigenbeamforming for downlink frequency-selective correlated fading channels |
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| 作者姓名： | 李勇朝 廖桂生 仝文宁 |
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| 作者单位： | National Key Laboratory for Radar Signal Processing Xidian University，National Key Laboratory for Radar Signal Processing Xidian University，School of Humanities and Arts Xidian University，Xi'an 710071 P.R. China，Xi'an 710071 P.R. China Xi'an 710071，P.R. China |
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| 基金项目： | Project supported by National Natural Science Foundation ofChina (Grant No .60172028) ,，Natural Science Foundation ofShanxi Province(Grant No .2004F45) |
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| 摘 要： | 1 Introduction Space-ti me coding (STC)1-4]is an emerging tech-nique in communications . Multi-input multi-output(MIMO) signals are encoded in both spatial and tem-poral domains .As a result ,diversity and coding gainsare achieved . Most works to date on this subject arebased on two fundamental assumptions . One is thatthe transmitter does not knowthe channel state infor-mation (CSI) ,i.e.,openloop .The otheris that fad-ing from each base station antenna to any mobile an-tenna is indepen…
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Spacetime coded eigenbeamforming for downlink frequencyselective correlated fading channels |
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| LI Yong-zhao LIAO Gui-sheng TONG Wen-ning. National Key Laboratory for Radar Signal Processing,Xidian University,Xi'an ,P.R. China . School of Humanities and Arts,Xidian University,Xi'an ,P.R. China.Spacetime coded eigenbeamforming for downlink frequency-selective correlated fading channels[J].Journal of Shanghai University(English Edition),2006(6). |
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| Authors: | LI Yong-zhao LIAO Gui-sheng TONG Wen-ning National Key Laboratory for Radar Signal Processing Xidian University Xi'an PR China School of Humanities and Arts Xidian University Xi'an PR China |
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| Institution: | LI Yong-zhao LIAO Gui-sheng TONG Wen-ning1. National Key Laboratory for Radar Signal Processing,Xidian University,Xi'an 710071,P.R. China 2. School of Humanities and Arts,Xidian University,Xi'an 710071,P.R. China |
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| Abstract: | To improve the performance of space-time coding over downlink frequency-selective correlated fading channels, a novel transmission scheme combining eigenbeamforming and OFDM is proposed. Provided that the channel correlated statistics are available at the transmitter, the wideband correlated fading channels can be converted into an independent FIR channel with 2 transmitting antennas and N receiving antennas by eigenbeamforming and dimension reduction. OFDM is utilized to convert the FIR channel into a group of independent parallel subchannels to carry space-time codes. With the new structure, the performance of space-time coding over downlink wideband correlated fading channels is greatly improved and the system complexity is reduced. Validity of the proposed system is verified by simulations under different conditions. Comparison between the new structure and an available structure is made both theoretically and computationally. |
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| Keywords: | frequency-selective correlated fading OFDM space-time coded eigenbeamforming |
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