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Proximal Policy Optimization-based Transmit Beamforming and Phase-shift Design in an IRS-aided ISAC System for the THz Band

Xiangnan Liu, Haijun Zhang, Keping Long, Mingyu Zhou, Yonghui Li, H. Vincent Poor
2022 IEEE Journal on Selected Areas in Communications  
In this paper, an IRS-aided integrated sensing and communications (ISAC) system operating in the terahertz (THz) band is proposed to maximize the system capacity.  ...  Then the joint optimization of transmit beamforming and phase-shift design is achieved by gradient-based, primal-dual proximal policy optimization (PPO) in the multi-user multiple-input single-output (  ...  In particular, transmit beamforming and phase-shift design in an IRS-aided device-based ISAC system with multiple users are studied.  ... 
doi:10.1109/jsac.2022.3158696 fatcat:fwrhh3ex7zeshmcn7cgg2qox5q

Terahertz-Band Integrated Sensing and Communications: Challenges and Opportunities [article]

Ahmet M. Elbir, Kumar Vijay Mishra, Symeon Chatzinotas, Mehdi Bennis
2022 arXiv   pre-print
However, ISAC at THz-band entails several design challenges such as beam split, range-dependent bandwidth, near-field beamforming, and distinct channel model.  ...  In particular, it provides an overview of antenna and array design, hybrid beamforming, integration with reflecting surfaces and data-driven techniques such as machine learning.  ...  For this purpose, a proximal policy optimization (PPO) approach with reinforcement learning (RL) is proposed in [9] , wherein the transmitter and IRS parameters are jointly optimized for THz-ISAC, wherein  ... 
arXiv:2208.01235v1 fatcat:l7c7x4fl4far3j757gxu2gt62q

Evolution of NOMA Toward Next Generation Multiple Access (NGMA) for 6G [article]

Yuanwei Liu and Shuowen Zhang and Xidong Mu and Zhiguo Ding and Robert Schober and Naofal Al-Dhahir and Ekram Hossain and Xuemin Shen
2022 arXiv   pre-print
Furthermore, we discuss advanced mathematical tools for facilitating the design of NOMA communication systems, including conventional optimization approaches and new machine learning techniques.  ...  Next, we propose a unified framework for NGMA based on multiple antennas and NOMA, where both downlink and uplink transmissions are considered, thus setting the foundation for this emerging research area  ...  The authors of [217] proposed a DDPG-based algorithm to jointly optimize the NOMA user partition, RIS phase shift, and NOMA power allocation policy to maximize the sum rate.  ... 
arXiv:2108.04561v2 fatcat:yy2wmlweffft5b2wzefkrde6za

6G for Vehicle-to-Everything (V2X) Communications: Enabling Technologies, Challenges, and Opportunities [article]

Md. Noor-A-Rahim, Zilong Liu, Haeyoung Lee, M. Omar Khyam, Jianhua He, Dirk Pesch, Klaus Moessner, Walid Saad, H. Vincent Poor
2022 arXiv   pre-print
Aiming for truly intelligent transportation systems, we envision that machine learning will play an instrumental role for advanced vehicular communication and networking.  ...  To this end, we provide an overview on the recent advances of machine learning in 6G vehicular networks.  ...  An architecture for an OFDM based RadCom system has been studied in [104] with unique advantages to the radar application, such as, very high dynamic range, independence from the transmitted user data  ... 
arXiv:2012.07753v2 fatcat:u5edqsewbzgthlkgc3nooqmdo4

6G for Vehicle-to-Everything (V2X) Communications: Enabling Technologies, Challenges, and Opportunities

Md. Noor-A-Rahim, Zilong Liu, Haeyoung Lee, Mohammad Omar Khyam, Jianhua He, Dirk Pesch, Klaus Moessner, Walid Saad, H. Vincent Poor
2022 Proceedings of the IEEE  
This article provides a comprehensive overview of the scientific and technological advances that have the capability to shape future 6G vehicle-to-everything (6G-V2X) communications.  ...  An architecture for an OFDM-based RadCom system has been studied in [104] with unique advantages to the radar application, such as very high dynamic range, independence from the transmitted user data  ...  One of the main challenges in THz-assisted 6G-V2X will be the effective use of traditional cellular and new THz bands.  ... 
doi:10.1109/jproc.2022.3173031 fatcat:vo37ywop6babtmnl7nnq3kmgqa

6G Technology Overview - One6G White Paper [article]

One6G Association
2022 Zenodo  
In this white paper, we give an overview of the key enabling technologies that constitute the pillars for the evolution toward 6G.  ...  6G is supposed to address the demands for consumption of mobile networking services in 2030 and beyond.  ...  There are already numerous works aimed at optimizing the parameters (amplitudes, phase shifts) of an IRS according to the desired use case.  ... 
doi:10.5281/zenodo.6630705 fatcat:rghtxgovubc5zartbe2qx4ekvm