3D Beamforming Through Joint Phase-Time Arrays
CoRR(2024)
摘要
High-frequency wide-bandwidth cellular communications over mmW and sub-THz
offer the opportunity for high data rates, however, it also presents high
pathloss, resulting in limited coverage. To mitigate the coverage limitations,
high-gain beamforming is essential. Implementation of beamforming involves a
large number of antennas, which introduces analog beam constraint, i.e., only
one frequency-flat beam is generated per transceiver chain (TRx). Recently
introduced joint phase-time array (JPTA) architecture, which utilizes both true
time delay (TTD) units and phase shifters (PSs), alleviates analog beam
constraint by creating multiple frequency-dependent beams per TRx, for
scheduling multiple users at different directions in a frequency-division
manner. One class of previous studies offered solutions with "rainbow" beams,
which tend to allocate a small bandwidth per beam direction. Another class
focused on uniform linear array (ULA) antenna architecture, whose
frequency-dependent beams were designed along a single axis of either azimuth
or elevation direction. In this paper, we present a novel 3D beamforming
codebook design aimed at maximizing beamforming gain to steer radiation toward
desired azimuth and elevation directions, as well as across sub-bands
partitioned according to scheduled users' bandwidth requirements. We provide
both analytical solutions and iterative algorithms to design the PSs and TTD
units for a desired subband beam pattern. Through simulations of the
beamforming gain, we observe that our proposed solutions outperform the
state-of-the-art solutions reported elsewhere.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要