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Application of Microperforated-Panel Absorber in Communication products

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Journal of Applied Mathematics and Physics 2018年第1期6卷 51-57页

作者： Wenfang Yu Xianming Zhang Qingshan Dong Reliability Department Wireless Product R & D Institute Wireless Product Operation Division ZTE Corporation Shenzhen China

Base on Prof. Maa Dah-You’s general theory of the microperforated-panel (MPP) absorber, We designed a noise reduction structure-sound attenuating cabinet (SAC). It can be applied to air-cooled communication products to reduce system noise. This article introduces engineering design method of SAC and laboratory test noise reduction results of application of SAC.

关键词： Microperforated-Panel (MPP) Sound Attenuating Cabinet (SAC) Air-Cooled Communication products

Iterative Phase Noise Suppression for Full-Duplex Communication Systems

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China Communications 2023年第2期20卷 226-234页

作者： Pengxin Guan Yiru Wang Hongkang Yu Yuping Zhao School of Electronics Engineering and Computer Science Peking UniversityBeijing 100871China wireless product Research and Development Institute ZTE CorporationShenzhen 518057China

Oscillator phase noise is one of the bottlenecks that limits the self-interference(SI)cancellation capability of full-duplex *** this paper,we propose a method for the suppression of common phase error(CPE)and intercarrier interference(ICI)induced by the phase noise in full-duplex orthogonal frequency division multiplexing(OFDM)***,we regard the effect of CPE as a portion of the SI channel and perform estimation,reconstruction and elimination in the time ***,the ICI signal is estimated and suppressed in the frequency ***,by analysing the performance of proposed algorithm,we further develop an iterative mechanism to reduce the parameter estimation error and improve SI cancellation *** results show that the proposed method has a significant SI cancellation capability improvement over the traditional SI cancellation schemes.

关键词： full-duplex self-interference phase noise suppression

Deterministic and Stochastic Simulators for Non-Isotropic V2V-MIMO Wideband Channels

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China Communications 2018年第7期15卷 18-29页

作者： Yiran Li Xiang Cheng Nan Zhang State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University wireless Algorithm Department Product Research and Development System ZTE Corporation

In this paper, we consider a novel two-dimensional(2D) geometry-based stochastic model(GBSM) for multiple-input multiple-output(MIMO) vehicle-to-vehicle(V2V) wideband fading channels. The proposed model employs the combination of a two-ring model and a multiple confocal ellipses model, where the signal is sum of the line-of-sight(Lo S) component, single-bounced(SB) rays, and double-bounced(DB) rays. Based on the reference model, we derive some expressions of channel statistical properties, including space-time correlation function(STCF), Doppler spectral power density(DPSD), envelope level crossing rate(LCR) and average fade duration(AFD). In addition, corresponding deterministic and stochastic simulation models are developed based on the reference model. Moreover, we compare the statistical properties of the reference model and the two simulation models in different scenarios and investigate the impact of different vehicular traffic densities(VTDs) on the channel statistical properties of the proposed model. Finally, the great agreement between simulation models and the reference model demonstrates not only the utility of simulation models, but also the correctness of theoretical derivations and simulations.

关键词： vehicle-to-vehicle wideband channels simulation model statistical properties

Joint Resource Allocation and Admission Control in Sliced Fog Radio Access Networks

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China Communications 2020年第8期17卷 14-30页

作者： Yuan Ai Gang Qiu Chenxi Liu Yaohua Sun State Key Laboratory of Network and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China LTE&5G wireless product R&D Institute ZTE CorporationShenzhen 518057China

Network slicing based fog radio access network(F-RAN) has emerged as a promising architecture to support various novel applications in 5 G-and-beyond wireless networks. However, the co-existence of multiple network slices in F-RANs may lead to significant performance degradation due to the resource competitions among different network slices. In this paper, the downlink F-RANs with a hotspot slice and an Internet of Things(Io T) slice are considered, in which the user equipments(UEs) of different slices share the same spectrum. A novel joint resource allocation and admission control scheme is developed to maximize the number of UEs in the hotspot slice that can be supported with desired quality-of-service, while satisfying the interference constraint of the UEs in the Io T slice. Specifically, the admission control and beamforming vector optimization are performed in the hotspot slice to maximize the number of admitted UEs, while the joint sub-channel and power allocation is performed in the Io T slice to maximize the capability of the UEs in the Io T slice tolerating the interference from the hotspot slice. Numerical results show that our proposed scheme can effectively boost the number of UEs in the hotspot slice compared to the existing baselines.

关键词： NOMA fog radio access networks resource allocation admission control

Future Vision on Artificial Intelligence Assisted Green Energy Efficiency Network

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ZTE Communications 2023年第2期21卷 34-39页

作者： CHEN Jiajun GAO Yin LIU Zhuang LI Dapeng State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen 518055China wireless product R&D Institute ZTE CorporationShanghai 201203China

To meet the key performance requirement of the 5G network and the demand of the growing number of mobile subscribers,millions of base stations are being constructed.5G New Radio is designed to enable denser network deployments,which raises significant concerns about network energy *** learning(ML),as a kind of artificial intelligence(AI)technologies,can enhance network optimization performance and energy *** this paper,we propose AI/ML-assisted energy-saving strategies to achieve optimal performance in terms of cell shutdown duration and energy *** realize network intelligence,we put forward the concept of intrinsic AI,which integrates AI into every aspect of wireless communication networks.

关键词： machine learning energy efficiency traffic distribution load prediction intrinsic AI

Intelligence Driven wireless Networks in B5G and 6G Era:A Survey

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ZTE Communications 2024年第3期22卷 99-105页

作者： GAO Yin CHEN Jiajun LI Dapeng State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen 518055China wireless product R&D Institute ZTE CorporationShanghai 201203China

As the wireless communication network undergoes continuous expansion,the challenges associated with network management and optimization are becoming increasingly *** address these challenges,the emerging artificial intelligence(AI)and machine learning(ML)technologies have been introduced as a powerful *** empower wireless networks to operate autonomously,predictively,ondemand,and with smart functionality,offering a promising resolution to intricate optimization *** paper aims to delve into the prevalent applications of AI/ML technologies in the optimization of wireless *** paper not only provides insights into the current landscape but also outlines our vision for the future and considerations regarding the development of an intelligent 6G network.

关键词： intelligent network native AI load prediction trajectory prediction

A review on GaN HEMTs:nonlinear mechanisms and improvement methods

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Journal of Semiconductors 2023年第12期44卷 31-46页

作者： Chenglin Du Ran Ye Xiaolong Cai Xiangyang Duan Haijun Liu Yu Zhang Gang Qiu Minhan Mi State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen 518055China wireless product Planning Department ZTE CorporationShenzhen 518055China School of Microelectronics Xidian UniversityXi’an 710071China

The GaN HEMT is a potential candidate for RF applications due to the high frequency and large power handling *** ensure the quality of the communication signal,linearity is a key parameter during the system ***,the GaN HEMT usually suffers from the nonlinearity problems induced by the nonlinear parasitic capacitance,transconductance,channel transconductance *** them,the transconductance reduction is the main contributor for the nonlinearity and is mostly attributed to the scattering effect,the increasing resistance of access region,the self-heating effect and the trapping *** on the mechanisms,device-level improvement methods of transconductance including the trapping suppression,the nanowire channel,the graded channel,the double channel,the transconductance compensation and the new material structures have been proposed *** features of each method are reviewed and compared to provide an overview perspective on the linearity of the GaN HEMT at the device level.

关键词： GaN HEMT linearity improvement transconductance reduction transconductance compensation nanowire channel graded channel

General Introduction of Non General Introduction of Non-Terrestrial Networks for New Radio

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ZTE Communications 2022年第S1期20卷 72-78页

作者： HAN Jiren GAO Yin Algorithm Department Wireless Product R&D InstituteZTE CorporationShanghai 201203China

In the new radio(NR)access technology,non-terrestrial networks(NTN)are intro-duced to meet the requirement of anywhere and anytime connections from the world *** the introduction of NTN,the NR system is able to offer the wide-area coverage and en-sure the service availability for *** this paper,the general aspects of NTN are intro-duced,including the NTN architecture overview,the impact of NTN on next-generation radio access network(NG-RAN)interface functions,mobility scenarios and other NTN related *** current progress in 3GPP Release 17 is also provided.

关键词： NR NTN satellite payload

Pragmatic Physical Layer Abstraction Method Based on Bit-LLR-Wise Exponential Effective SNR Mapping for Bit Interleaved Coded Orthogonal Frequency Division Multiplexing System

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Journal of Shanghai Jiaotong university(Science) 2014年第2期19卷 173-180页

作者：李孟实俞晖罗汉文徐友云 Institute of wireless Communication Technology Shanghai Jiaotong University

In this paper, we analyze the physical layer abstraction for bit interleaved coded orthogonal frequency division multiplexing(BIC-OFDM) system from a parallel bit channel perspective. By combining the exponential effective SNR(signal-to-noise ratio) mapping(EESM) with the maximum a posteriori(MAP) algorithm, a bit LLR(log-likelihood ratio) wise EESM(BL-EESM) method is proposed. This method can abstract the link performance with high accuracy, especially for the case when channel estimation is imperfect. Afterward, the BL-EESM method is simplified by utilizing the non-linear quantization idea, which can reduce the times of exponential operation by two orders of magnitude at wide system bandwidth, yet shows little loss in accuracy. Our proposal can be applied to both system level simulations to save the time consumption and to practical terminals to facilitate the adaptive modulation and coding(AMC) procedure, bringing about throughput improvement at low hardware cost.

关键词： physical layer abstraction parallel bit channel signal-to-noise ratio (SNR) exponential effective SNR mapping (EESM) adaptive modulation and coding (AMC) quantization