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Joint Phase Time Array: Opportunities, Challenges, and System Design Considerations
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DOI：10.1109/MCOM.001.2400677.png)
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摘要
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This article presents a novel approach to designing millimeter-wave (mmWave) cellular communication systems, based on joint phase time array (JPTA) radio frequency (RF) frontend architecture. JPTA architecture comprises time-delay components appended to conventional phase shifters, which offer extra degrees of freedom to be exploited for designing frequency-selective analog beams. Hence, a mmWave device equipped with JPTA can receive and transmit signals in multiple directions in a single time slot per RF chain, one direction per frequency subband, which alleviates the traditional constraint of one analog beam per transceiver chain per time slot. The utilization of subband-specific analog beams offers a new opportunity in designing mmWave systems, allowing for enhanced cell capacity and reduced pilot overhead. To understand the practical feasibility of JPTA, a few challenges and system design considerations are discussed in relation to the performance and complexity of the JPTA systems. For example, frequency-selective beam gain losses are present for the subband analog beams, e.g., up to 1 dB losses for 2 subband cases, even with the state-of-the-art JPTA delay and phase optimization methods. Despite these side effects, system-level analysis reveals that the JPTA system is capable of improving cell capacity: 5%-tile cell throughput by up to 65%. To the best of the authors' knowledge, this article is the first to explain the system-level benefits and system-design challenges of JPTA, with an analysis of the performance tradeoff based on an intuitive metric of beam gain losses.
Keyword:
DELAY
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8.2
论文数:
6.9K
被引数:
2.2W
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引用论文
Yildiz, O.; AlAmmouri, A.; Mo, J.; Nam, Y.; Erkip, E.; Zhang, J.C. 3D Beamforming Through Joint Phase-Time Arrays. In Proceedings of the 2024 IEEE 100th Vehicular Technology Conference (VTC2024-Fall), Washington, DC, USA, 7–10 October 2024; pp. 1–7. [Google Scholar] [CrossRef]Yildiz, O.; AlAmmouri, A.; Mo, J.; Nam, Y.; Erkip, E.; Zhang, J.C. 通过联合相位-时间阵列实现3D波束成形。发表于2024年IEEE第100届 vehicular Technology Conference (VTC2024-Fall) 会议论文集，美国华盛顿特区，2024年10月7日至10日；第1-7页。[Google Scholar] [CrossRef].png)
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