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Radio propagationmeasurement and cluster-based analysis formillimeter-wave cellular systems in dense urban environments

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Frontiers of Information Technology & Electronic Engineering 2021年第4期22卷 471-487页

作者： Peize ZHANG Haiming WANG Wei HONG State Key Laboratory of Millimeter Waves Southeast UniversityNanjing 210096China Purple Mountain Laboratories Nanjing 211111China

The deployment of millimeter-wave(mmWave)cellular systems in dense urban environments with an acceptable coverage and cost-efficient transmission scheme is essential for the rollout of fifth-generation and beyond *** this paper,cluster-based analysis of mmWave channel characteristics in two typical dense urban environments is ***,radio propagation measurement campaigns are conducted in two identified mmWave bands of 28 and 39 GHz in a central business district and a dense residential *** customdesigned channel sounder supports high-efficiency directional scanning sounding,which helps collect sufficient data for statistical channel ***,using an improved auto-clustering algorithm,multipath clusters and their scattering sources are *** appropriate measure for inter-and intra-cluster characteristics is provided,which includes the cluster number,the Ricean K-factor,root-mean-squared(RMS)delay spread,RMS angular spread,and their *** of these parameters across two mmWave bands for both line-of-sight(LoS)and non-light-of-sight(NLoS)links are *** shed light on the blockage effects,detailed analysis of the propagation mechanisms corresponding to each NLoS cluster is provided,including reflection from exterior walls and diffraction over building corners and ***,the results show that the cluster-based analysis takes full advantage of mmWave beamspace channel characteristics and has further implications for the design and deployment of mmWave wireless networks.

关键词： Millimeter-wave communication Clustering Diffraction multipath channels Propagation measurement

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Modified Wiener Beamforming for Indoor Channel Improvement

Modified Wiener Beamforming for Indoor Channel Improvement

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1998 International Conference on Communication Technology

作者： Gao Xing Huang Ya-Ru Inner Mongolia University

ISBN: (纸本)7800908275

＜正＞The impulse response of an indoor channel varies with different environments and spatial positions of a transceiver pair as a function of the phase relationship among individual multipath components that have variety of time *** factor results in various fading especially in a chip duration of the Direct Sequence Code Division Multiple（DS-CDMA） *** solve this problem,a Modified Wiener Beamforming（MWB） has been proposed to co-phase the multipath components and then combine them by maximum ratio combining in a chip duration We derive formulas for MWB with a method to separate and estimate multipath vectors through each *** purpose is to isolate and recombine multipath components before they are added together as a phasor to produce ***,the fading of Rayleigh or Rice distributed multipath in a chip duration can be reduced to a *** results are presented by using a three-dimension ray tracing to support the proposed method.

关键词： array signal processing spread spectrum communication code division multiple access multiuser channels multipath channels Rician channels Rayleigh channels indoor radio ray tracing transient response direction-of-arrival estimation modified Wiener beamforming indoor channel improvement impulse response indoor channel spatial positions transceiver pair phase relationship multipath components time delays chip duration direct sequence code division multiple access DS-CDMA system maximum ratio combining multipath vectors Rice distributed multipath Rayleigh distributed multipath simulation results 3D ray tracing antenna array

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