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MIMO-OFDMA波束成形的反馈设计 被引量：1

Feedback Design in MIMO-OFDMA Beamforming Scheme
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摘要 MIMO-OFDMA的波束成形算法中,接收机需要反馈信道状态信息。当系统用户、子载波、天线数增加时,反馈量随之线性增长。为了限制反馈量在一个固定的限度之下,文中提出一种预设门限的反馈算法。接收机在确定每个子载波上的最优波束成形矢量及相应的信噪比之后,只有当信噪比大于门限时,才反馈最优波束成形矢量的索引及相应的信噪比值。该算法可以大大降低反馈量,同时保证频谱利用率几乎不变。 In a MIMO-OFDMA beamforming scheme, receivers need to convey the Channel State Information （CSI）. When user, subcarrier, antenna numbers rise, feedback data increase linearly. In order to limit the feedback data in a fix level, a prefixed-threshold-based feedback scheme is proposed in this paper. Afer the receiver determines the optimal beamforming vector and the corresponding channel SNR, the index of the optimal bear, forming vector and the value of SNR are converyed only when the value of SNR is bigger than the threshold. This scheme can significantly reduce the feedback data while the downlink spectral efficiency keeps almost stable.
作者 蒋晓琪 李昊 徐昌庆
机构地区 上海交通大学电子工程系
出处 《通信技术》 2009年第1期3-5,共3页 Communications Technology
基金 国家自然科学基金资助项目(No.60572156)
关键词 MIMO-OFDMA 波束成形 门限 MIMO-OFDMA beamforming threshold
分类号 TN911 [电子电信—通信与信息系统]
  • 相关文献

参考文献6

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共引文献2

同被引文献10

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通信技术
2009年 第1期

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