Beamforming with Multiple One-Bit Wireless Transceivers
Beamforming with Multiple One-Bit Wireless Transceivers
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DOI：
10.1109/ita.2018.8503219
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发表时间：
2018-02
期刊：
影响因子：
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通讯作者：
Kang Gao;J. N. Laneman;B. Hochwald
中科院分区：
文献类型：
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作者：
Kang Gao;J. N. Laneman;B. Hochwald
传统的波束成形技术依赖于高度线性的发射机和接收机，以允许在发射机和接收机处进行相位相干组合。发射机使用波束成形来将信号功率导向接收机，并且接收机使用波束成形来收集并相干地联合收割机组合来自多个接收机天线的信号。当发射机和接收机由于功率和成本原因而被限制为非线性1比特设备时，与波束成形相关联的潜在优点和性能度量没有被很好地理解。我们定义在发送端的波束形成作为一个码本设计问题，以最大限度地提高码字之间的最小距离。我们定义在接收机的波束形成作为发送码字的最大似然检测器。我们表明，波束成形与一位收发器是一个星座设计问题，我们可以在几dB的SNR线性收发器所达到的能力。
Classical beamforming techniques rely on highly linear transmitters and receivers to allow phase-coherent combining at the transmitter and receiver. The transmitter uses beamforming to steer signal power towards the receiver, and the receiver uses beamforming to gather and coherently combine the signals from multiple receiver antennas. When the transmitters and receivers are instead constrained for power and cost reasons to be nonlinear one-bit devices, the potential advantages and performance metrics associated with beamforming are not as well understood. We define beamforming at the transmitter as a codebook design problem to maximize the minimum distance between codewords. We define beamforming at the receiver as the maximum likelihood detector of the transmitted codeword. We show that beamforming with one-bit transceivers is a constellation design problem, and that we can come within a few dB SNR of the capacity attained by linear transceivers.