Transmit Beamforming for MIMO Optical Wireless Communication Systems

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• 作者：Liang Wu (1)
  Zaichen Zhang (1)
  Huaping Liu (2)
  
• 关键词：Beamforming ; Flat fading ; Frequency selective fading ; Optical wireless communications (OWCs)
• 刊名：Wireless Personal Communications
• 出版年：2014
• 出版时间：September 2014
• 年：2014
• 卷：78
• 期：1
• 页码：615-628
• 全文大小：535 KB
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• 作者单位：Liang Wu (1)
  Zaichen Zhang (1)
  Huaping Liu (2)
  
  1. National Mobile Communications Research Laboratory, Southeast University, Nanjing聽, 210096, China
  2. School of Electrical Engineering and Computer Science, Oregon State University Corvallis, Corvallis, OR, 97331, USA
  
• ISSN：1572-834X

文摘

This paper focuses on transmit beamforming for multiple-input multiple-output optical wireless communication (OWC) systems with intensity modulation and direct detection (IM/DD). OWC with IM/DD requires the transmitted signals to be nonnegative, for which existing beamforming schemes developed for radio frequency systems cannot be applied directly. We propose effective schemes for OWC over frequency flat and frequency selective channels. For frequency flat fading, the property of the beamforming vector is derived. For frequency selective fading, bit-error rate performances of the proposed scheme with zero-forcing and minimum mean-square error frequency domain equalization receivers are derived, and a suboptimal beamforming vector for frequency selective fading channels is proposed. Compared with asymmetrically clipped optical orthogonal frequency division multiplexing based frequency domain beamforming, the proposed scheme needs much less feedback information and has a better error performance.