Enhanced beamforming for 60GHz OFDM system with co-channel interference mitigation
Enhanced beamforming for 60GHz OFDM system with co-channel interference mitigation
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DOI：
10.1109/icuwb.2011.6058850
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发表时间：
2011-10
期刊：
影响因子：
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通讯作者：
Zhiwei Lin;Xiaoming Peng;Francois Chin
中科院分区：
文献类型：
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作者：
Zhiwei Lin;Xiaoming Peng;Francois Chin
波束形成是60 GHz无线通信系统工作在毫米波高损耗频段的关键技术之一。在IEEE 802.15.3c标准中，采用了基于码本的模拟波束形成机制，以实现其简单性和可行性。然而，当需要密集空间重用时，这种简单的波束扫描机制在存在共信道干扰（CCI）的情况下可能无法正常工作。针对60 GHz正交频分复用（OFDM）系统，提出了一种模拟和数字混合波束形成的增强波束形成技术。具有诸如基于码本的相控天线阵列的波束扫描机制由于其硬件简单性而可以应用于模拟波束成形。另一方面，可以引入多于一个RF链以实现自适应数字波束成形，从而提高性能和鲁棒性。提出了一种基于最小均方误差（MMSE）的切换波束或波束成形码字选择算法，用于这种混合模拟/数字波束成形结构，以在CCI存在下实现增强的干扰抑制和空间重用能力。
Beamforming is one of the key technique for 60GHz wireless system to work at this millimeter-wave region with high propagation path loss. In IEEE 802.15.3c standard, a codebook based analog beamforming mechanism is adopted for its simplicity and feasibility. However, this simple beam sweep mechanism may not work properly in the presence of Co-Channel Interference (CCI) when dense spatial reuse is required. In this paper, an enhanced beamforming technique is proposed with mixed analog and digital beamforming structure for 60GHz Orthogonal Frequency Division Multiplexing (OFDM) system. Beam sweep mechanism with such as codebook based phased antenna array can be applied to analog beamforming for its hardware simplicity. On the other hand, more than one RF chains can be introduced to enable adaptive digital beamforming for improved performance and robustness. A Minimum Mean Square Error (MMSE) based switched beam or beamforming codeword selection algorithm is proposed for this mixed analog/digital beamforming structure to achieve enhanced interference mitigation and spatial reuse capability in the presence of CCI.