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Non-Orthogonal Transmission for User and Control Plane split architecture in 5G Systems and Beyond: Performance Analysis and Design Insights

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China Communications 2022年第11期19卷 179-194页

作者： Xianling Wang Haijun Zhang Yitong Liu Chen Zhu Yue Tian Fujian Key Laboratory of Communication Network and Information Processing Xiamen University of TechnologyXiamen 361024China University of Science and Technology Beijing Beijing 100083China Beijing University of Posts and Telecommunications Beijing 100876China

In next generation networks,mobility management will be a critical issue due to dense base station(BS)deployment,for which user and control plane split architecture provides a promising solution.Jointly designing such architecture with nonorthogonal transmission brings in more flexibility to further improve system efficiency.This paper proposes a non-orthogonal transmission design for user and control plane split architecture.In this design,user equipments(UEs)will select the BS providing the strongest received signal to associate its data channel,but constantly connect its control channel to the nearest macro-cell BS(MBS).Upon non-orthogonal transmission,an MBS can multiplex data traffics and control signals on the same resource.Stochastic geometry based analysis is carried out to investigate outage probability,which extends its regular definition by jointly considering data and control channels,and then mobility-aware outage rate.Numerical results show that:1)The proposed split architecture alleviates the increase in handover rate for ultra dense networking,compared with conventional architecture.2)Non-orthogonal transmission outperforms traditional orthogonal transmission in the split architecture,because it is capable of accommodating more control channels.3)By carefully adjusting power levels,minimum outage probabilities can be reached for macrocell UEs in the proposed design.

关键词： heterogeneous networks mobility management non-orthogonal transmission split architecture stochastic geometry

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split-ADC BASED DIGITAL BACKGROUND CALIBRATION FOR TIME-INTERLEAVED ADC

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Journal of Electronics(China) 2012年第3期29卷 302-309页

作者： Zhang Rui Yin Yongsheng Gao Minglun Institute of Very Large Scale Integration Hefei University of TechnologyHefei 230009China

A novel Time-Interleaved Analog-to-Digital Converter (TIADC) digital background calibration for the mismatches of offsets, gain errors, and timing skews based on split-ADC is proposed. Firstly, the split-ADC channels in present TIADC architecture are designed to convert input signal at two different channel sampling rates so that redundant channel to facilitate pair permutation is avoided. Secondly, a high-order compensation scheme for correction of timing skew error is employed for effective calibration to preserve high-resolution when input frequency is high. Numerical simulation performed by MATLAB for a 14-bit TIADC based on 7 split-ADC channels shows that Signal-to-Noise and Distortion Ratio (SNDR) and Spurious Free Dynamic Range (SFDR) of the TIADC achieve 86.2 dBc and 106 dBc respectively after calibration with normalized input frequency near Nyquist frequency.

关键词： Time-Interleaved Analog-to-Digital Coverter (TIADC) split architecture Digital background calibration Adaptive calibration High-order timing skew compensation

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split-ADC BASED DIGITAL BACKGROUND CALIBRATION FOR TIME-INTERLEAVED ADC

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Journal of Electronics(China) 2012年第Z2期 302-309页

作者： Zhang Rui Yin Yongsheng Gao Minglun (Institute of Very Large Scale Integration, Hefei University of Technology, Hefei 230009, China)

关键词： Time-Interleaved Analog-to-Digital Coverter (TIADC) split architecture Digital background calibration Adaptive calibration High-order timing skew compensation

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