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arXiv 1608.02830cs.ITmath.IT
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基于移相器选择的大型阵列天线混合波束形成

Hybrid Beamforming for Large Antenna Arrays with Phase Shifter Selection

Sohail Payami, Mir Ghoraishi, Mehrdad Dianati

摘要:

利用信道矩阵奇异向量的性质,提出了一种适用于大型天线阵列的渐进最优混合波束形成方案。它示出了具有瑞利衰落的信道矩阵的元素遵循正态分布时,采用大的天线阵列。所提出的波束形成算法在稀疏和丰富的传播环境中都是有效的,并且适用于点对点和多用户场景。此外,一个封闭形式的表达式和下限的可实现的速率时,模拟和数字移相器。它示出的混合波束形成器的性能,使用移相器与超过2位的分辨率与模拟相移。在瑞利衰落信道模型下,提出了一种降低移相器网络功耗的移相器选择方案。使用该选择方案,可以随着移相器网络中的功耗的降低而增加频谱效率。与所有移相器都工作的情况相比,仿真结果表明,当多达50%的移相器被关闭时,频谱效率增加。

英文摘要:

This paper proposes an asymptotically optimal hybrid beamforming solution for large antenna arrays by exploiting the properties of the singular vectors of the channel matrix. It is shown that the elements of the channel matrix with Rayleigh fading follow a normal distribution when large antenna arrays are employed. The proposed beamforming algorithm is effective in both sparse and rich propagation environments, and is applicable for both point-to-point and multiuser scenarios. In addition, a closed-form expression and a lower-bound for the achievable rates are derived when analog and digital phase shifters are employed. It is shown that the performance of the hybrid beamformers using phase shifters with more than 2-bits resolution is comparable with analog phase shifting. A novel phase shifter selection scheme that reduces the power consumption at the phase shifter network is proposed when the wireless channel is modeled by Rayleigh fading. Using this selection scheme, the spectral efficiency can be increased as the power consumption in the phase shifter network reduces. Compared to the scenario that all of the phase shifters are in operation, the simulation results indicate that the spectral efficiency increases when up to 50% of phase shifters are turned off.

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