Enhanced beamforming for 60GHz OFDM system with co-channel interference mitigation

2011 IEEE International Conference on Ultra-Wideband (ICUWB) Pub Date : 2011-10-24 DOI:10.1109/ICUWB.2011.6058850

Zhiwei Lin, Xiaoming Peng, F. Chin

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引用次数: 12

Abstract

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.

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60GHz OFDM系统的增强波束形成与同信道干扰抑制

波束形成是60GHz无线系统在这一传播路径损耗大的毫米波区域工作的关键技术之一。在IEEE 802.15.3c标准中，基于码本的模拟波束形成机制简单可行。然而，当需要密集的空间复用时，这种简单的波束扫描机制可能无法在同信道干扰(CCI)的存在下正常工作。针对60GHz正交频分复用(OFDM)系统，提出了一种模拟与数字混合波束形成的增强波束形成技术。基于码本的相控阵波束扫描机制由于硬件简单，可以应用于模拟波束形成。另一方面，可以引入多个射频链来实现自适应数字波束形成，以提高性能和鲁棒性。针对这种混合模拟/数字波束形成结构，提出了一种基于最小均方误差(MMSE)的交换波束或波束形成码字选择算法，以增强CCI存在下的干扰抑制和空间复用能力。

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2011 IEEE International Conference on Ultra-Wideband (ICUWB)

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