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Wideband Full-Duplex Phased Array With Joint Transmit and Receive Beamforming: Optimization and Rate Gains

Published: 01 April 2021 Publication History

Abstract

Full-duplex (FD) wireless and phased arrays are both promising techniques that can significantly improve data rates in future wireless networks. However, integrating FD with transmit (Tx) and receive (Rx) phased arrays is extremely challenging, due to the large number of self-interference (SI) channels. Previous work relies on either RF canceller hardware or on analog/digital Tx beamforming (TxBF) to achieve SI cancellation (SIC). However, Rx beamforming (RxBF) and the data rate gain introduced by FD nodes employing beamforming have not been considered yet. We study FD phased arrays with joint TxBF and RxBF with the objective of achieving improved FD data rates. The key idea is to carefully select the TxBF and RxBF weights to achieve wideband RF SIC in the spatial domain with minimal TxBF and RxBF gain losses. Essentially, TxBF and RxBF are <italic>repurposed</italic>, thereby not requiring specialized RF canceller circuitry. We formulate the corresponding optimization problem and develop an iterative algorithm to obtain an approximate solution with provable performance guarantees. Using SI channel measurements and datasets, we extensively evaluate the performance of the proposed approach in different use cases under various network settings. The results show that an FD phased array with 9/36/72 elements can cancel the total SI power to below the noise floor with sum TxBF and RxBF gain losses of 10.6/7.2/6.9dB, even at Tx power level of 30dBm. Moreover, the corresponding FD rate gains are at least 1.33/1.66/1.68<inline-formula> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula>.

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  • (2024)Joint Transmit and Receive Wideband Beamforming for Spatial SIC in STAR Phased Array SystemsIEEE Transactions on Signal Processing10.1109/TSP.2024.343447272(4253-4267)Online publication date: 1-Jan-2024
  • (2023)Wireless Powered Mobile Edge Computing Networks: A SurveyACM Computing Surveys10.1145/357999255:13s(1-37)Online publication date: 13-Jul-2023
  • (2023)Transfer Beamforming via Beamforming for TransferIEEE Transactions on Mobile Computing10.1109/TMC.2023.331874123:5(6243-6257)Online publication date: 25-Sep-2023
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          cover image IEEE/ACM Transactions on Networking
          IEEE/ACM Transactions on Networking  Volume 29, Issue 4
          Aug. 2021
          473 pages

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          IEEE Press

          Publication History

          Published: 01 April 2021
          Published in TON Volume 29, Issue 4

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          • (2024)Joint Transmit and Receive Wideband Beamforming for Spatial SIC in STAR Phased Array SystemsIEEE Transactions on Signal Processing10.1109/TSP.2024.343447272(4253-4267)Online publication date: 1-Jan-2024
          • (2023)Wireless Powered Mobile Edge Computing Networks: A SurveyACM Computing Surveys10.1145/357999255:13s(1-37)Online publication date: 13-Jul-2023
          • (2023)Transfer Beamforming via Beamforming for TransferIEEE Transactions on Mobile Computing10.1109/TMC.2023.331874123:5(6243-6257)Online publication date: 25-Sep-2023
          • (2023)Scalable In-Band Full-Duplex Phased Arrays: Complexity Reduction and Distributed ProcessingIEEE Journal on Selected Areas in Communications10.1109/JSAC.2023.328754341:9(2808-2820)Online publication date: 1-Sep-2023

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