True-Time-Delay Beamforming Receiver With RF Re-Sampling
True-Time-Delay Beamforming Receiver With RF Re-Sampling
复制标题
具有射频重采样功能的真时延波束成形接收器
DOI：
10.1109/tcsi.2020.3005475
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
J. Ryynänen
中科院分区：
文献类型：
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作者：
Kalle Spoof;Vishnu Unnikrishnan;M. Zahra;K. Stadius;M. Kosunen;J. Ryynänen
在具有较大相对带宽的混合波束形成接收机中，需要模拟域真时延（TTD）来缓解波束偏斜问题。我们提出了一种真正的时间延迟波束成形接收机架构，使斜视自由宽带空间滤波之前的A/D转换。该接收机通过对无源混频器的离散时间输出进行延迟重采样来实现真实时间延迟。该接收机具有将波束成形延迟的范围从具有脉冲跳过的本机振荡器（LO）信号的RF信号的一个载波周期扩展到若干载波周期的能力，从而实现具有大天线阵列的TTD波束成形。此外，提出了具有并行混频器的多相结构，以防止由脉冲跳过LO信号的降低的采样率导致的频谱混叠。此外，最大波束成形延迟与LO频率成比例，从而在由波长设置的天线间隔较大的低频处也支持大型阵列。我们验证了所提出的概念与晶体管级模拟的接收器实现了28纳米CMOS工艺。该设计实现了400 MHz RF带宽的无斜波束成形，以及三个载波时间段的最大波束成形延迟。3 GHz载波频率的功耗为每个天线4 mW。
Analog domain true-time-delays (TTD) are desired in hybrid beamforming receivers with large relative bandwidths to mitigate the problem of beam squint. We propose a true-time-delay beamforming receiver architecture which enables squint-free wideband spatial filtering prior to the A/D conversion. The receiver implements true-time-delay with delayed re-sampling of the discrete-time output of a passive mixer. The receiver has the capability to extend the range of the beamforming delays from one to several carrier periods of the RF signal with pulse-skipped local oscillator (LO) signals, thereby enabling TTD beamforming with large antenna arrays. Further, a polyphase structure with parallel mixers is proposed to prevent spectral aliasing resulting from the lowered sample rate of the pulse-skipped LO signals. In addition, the maximum beamforming delay scales with the LO frequency, supporting large arrays also at low frequencies where the antenna separation set by the wavelength is large. We verify the proposed concepts with transistor-level simulation of the receiver implemented with a 28-nm CMOS process. The design achieves a squint-free beamforming for a 400 MHz RF bandwidth, and a maximum beamforming delay of three carrier time periods. The power consumption for a 3 GHz carrier frequency is 4 mW per antenna.
大阵列波束形成器的集成离散时延补偿技术
DOI：
10.1109/tcsi.2019.2926309
发表时间：
2019
期刊：
IEEE Transactions on Circuits and Systems I: Regular Papers
影响因子：
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作者：
Ghaderi, Erfan;Sivadhasan Ramani, Ajith;Rahimi, Arya A.;Heo, Deukhyoun;Shekhar, Sudip;Gupta, Subhanshu
通讯作者：
Gupta, Subhanshu