| MIMO-OFDMA波束成形的反馈设计 |
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| 引用本文： | 蒋晓琪,李昊,徐昌庆.MIMO-OFDMA波束成形的反馈设计[J].通信技术,2009,42(1):3-5. |
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| 作者姓名： | 蒋晓琪 李昊 徐昌庆 |
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| 作者单位： | 上海交通大学电子工程系,上海,200240 |
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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。
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| 关 键 词： | MIMO-OFDMA 波束成形 门限 |
Feedback Design in MIMO-OFDMA Beamforming Scheme |
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| JIANG Xiao-qi,LI Hao,XU Chang-qing.Feedback Design in MIMO-OFDMA Beamforming Scheme[J].Communications Technology,2009,42(1):3-5. |
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| Authors: | JIANG Xiao-qi LI Hao XU Chang-qing |
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| Affiliation: | (Department of Electronic Engineering , Shanghai Jiaotong University, Shanghai 200240, China) |
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| Abstract: | 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. |
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| Keywords: | MIMO-OFDMA beamforming threshold |
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