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Channel Measurement and Analysis of Human Body Radar Cross Section in 26 GHz ISAC Systems
DUAN Hongyu, WANG Mengyang, DUO Hao, HE Danping, MA Yihua, LU Bin, ZHONG Zhangdui
ZTE Communications    2025, 23 (2): 3-10.   DOI: 10.12142/ZTECOM.202502002
Abstract27)   HTML1)    PDF (2126KB)(18)       Save

Radar cross section (RCS) plays a critical role in modeling target scattering characteristics and enhancing the precision of target detection and localization in integrated sensing and communication (ISAC) systems. This paper investigates the human body RCS at 26 GHz via multi-angle channel measurements under different clothing conditions. Based on calibrated electromagnetic (EM) parameters, the RCS characteristics of the human body in far-field conditions are analyzed using ray-tracing (RT) simulations. Some suggestions for the design of ISAC systems are also discussed. The results provide a solid theoretical foundation and practical reference for the modeling of target scattering characteristics for ISAC channels.

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Measurement and Analysis of Radar-Cross-Section of UAV at 21–26 GHz Frequency Band
AN Hao, LIU Ting, HE Danping, MA Yihua, DOU Jianwu
ZTE Communications    2025, 23 (1): 107-114.   DOI: 10.12142/ZTECOM.202501014
Abstract117)   HTML3)    PDF (1717KB)(85)       Save

With the emergence of the 6G technology, integrated sensing and communication (ISAC) has become a hot-spot vertical application. The low-altitude scenario is considered to be a significant use case of the ISAC. However, the existing channel model is hard to meet the demands of the sensing function. The radar-cross-section (RCS) is a critical feature for the sensing part, while accurate RCS data for the typical frequency band of ISAC are still lacking. Therefore, this paper conducts measurements and analysis of the RCS data of the unmanned aerial vehicles (UAVs) under multiple poses and angles in real flying conditions. The echo from a UAV is acquired in an anechoic chamber, and the RCS values are calculated. The results of different flying attitudes are analyzed, providing RCS features for the ISAC applications.

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Massive Unsourced Random Access Under Carrier Frequency Offset
XIE Xinyu, WU Yongpeng, YUAN Zhifeng, MA Yihua
ZTE Communications    2023, 21 (3): 45-53.   DOI: 10.12142/ZTECOM.202303007
Abstract125)   HTML8)    PDF (1438KB)(264)       Save

Unsourced random access (URA) is a new perspective of massive access which aims at supporting numerous machine-type users. With the appearance of carrier frequency offset (CFO), joint activity detection and channel estimation, which is vital for multiple-input and multiple-output URA, is a challenging task. To handle the phase corruption of channel measurements under CFO, a novel compressed sensing algorithm is proposed, leveraging the parametric bilinear generalized approximate message passing framework with a Markov chain support model that captures the block sparsity structure of the considered angular domain channel. An uncoupled transmission scheme is proposed to reduce system complexity, where slot-emitted messages are reorganized relying on clustering unique user channels. Simulation results reveal that the proposed transmission design for URA under CFO outperforms other potential methods.

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Truly Grant-Free Technologies and Protocols for 6G
MA Yihua, YUAN Zhifeng, LI Weimin, LI Zhigang
ZTE Communications    2021, 19 (4): 105-110.   DOI: 10.12142/ZTECOM.202104012
Abstract113)   HTML3)    PDF (808KB)(338)       Save

The further integration of telecommunications and industry has been considerable and is expected to bring significant benefits to society and economics in 6G. It also forms some evolution trends for next-generation communication systems, including further rises in machine-type communications (MTC), uplink-dominated systems, and decentralized structures. However, the existing access protocols are not friendly to these trends. This paper analyzes the problems of existing access protocols and provides novel access technologies to solve them. These technologies include contention-based non-orthogonal multiple access (NOMA), data features, enhanced pilot design and successive interference cancellation (SIC) of diversity. With these key enablers, truly grant-free access can be realized, and some potential modifications of protocols are then analyzed. Finally, this paper uses massive and critical scenarios in digital transformations to show the great necessity of introducing novel access technologies into future communication protocols.

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