ID 原文 译文
18905 数值仿真表明，与传统常规波束形成(CBF)、最小方差无畸变响应(MVDR)、传统多重信号分类(MUSIC)及基于稀疏低秩分解的增强拉格朗日乘子(SLD-ALM)算法相比，有限次采样条件下所提算法具有较高DOA估计精度及较好稳健性能。 Compared with the traditional Conventional BeamForming (CBF),Minimum Variance Distortionless Response(MVDR), MUltiple SIgnal Classification (MUSIC) and Sparse andLow-rank Decomposition based Augmented Lagrange Multiplier(SLD-ALM) algorithms, numerical simulations show that the proposed algorithm has higher DOA estimation accuracy and better robustness performance under finite sampling snapshot.
18906 作为5G的关键技术之一，非正交多址(NOMA)通过非正交方式访问无线通信资源，以实现提高频谱利用率、增加用户连接数的目的。 As one of the key 5G technologies, Non-Orthogonal Multiple Access (NOMA) can improve spectrum efficiency and increase the number of user connections by utilizing the resources in a non-orthogonal manner.
18907 该文提出将压缩感知(CS)及广义正交匹配追踪(gOMP)算法引入上行免调度NOMA系统，从而增强NOMA系统活跃用户检测及数据接收的性能。 In the uplink grant-free NOMA system, the Compressive Sensing (CS) and generalized Orthogonal MatchingPursuit (gOMP) algorithm are introduced in active user and data detection, to enhance the system performance.
18908 通过每次迭代识别多个索引，gOMP算法实际上是传统的正交匹配追踪(OMP)算法的扩展。 The gOMP algorithm is literally generalized version of the Orthogonal Matching Pursuit (OMP)algorithm, in the sense that multiple indices are identified per iteration.
18909 为了获得最优性能，研究分析了在gOMP算法信号重构的每次迭代中所应选择的最优索引数目。 Meanwhile, the optimal number of indices selected per iteration in the gOMP algorithm is addressed to obtain the optimal performance.
18910 仿真结果表明：与其它的贪婪追踪算法及梯度投影稀疏重构(GPSR)算法相比，最优索引gOMP算法具有更优异的信号重构性能； Simulations verify that the gOMP algorithm with optimal number of indices has better recovery performance, compared with the greedy pursuit algorithms and the Gradient Projection Sparse Reconstruction (GPSR)algorithm.
18911 并且，对于不同的活跃用户数或过载率等参数配置的NOMA系统，均表现出最优的多用户检测性能。 In addition, given different system configurations in terms of the number of active users and subcarriers, the proposed gOMP with optimal number of indices also exhibits better performance than that of the other algorithms mentioned in this paper.
18912 采用近天底的宽刈幅干涉高度计是近年来新发展的海面高程测量技术，与陆地高程测量不同，海浪一直处于随机运动之中，其动态特性会在合成孔径雷达(SAR)成像和干涉处理中引入显著误差。 The wide-swath interferometric altimeter working at near-nadir is a newly developed ocean surface topography measurement technology in recent years. Different from land elevation measurement, for the dynamic ocean surface waves, they move randomly all the time and this brings bias in Synthetic ApertureRadar (SAR) imaging and interferometric processes and leads to the final height measurement errors.
18913 对于厘米级的干涉测量精度要求来说，该误差是主要误差源之一。 For the requirement of centimeter-level precision, this error is the main source of measurement errors.
18914 该文研究了由海面特性引起的高程误差机理及其对于近天底干涉SAR测高精度的影响，建立了运动误差理论模型，同时考虑了电磁偏差与叠掩偏差影响。 The errors due to the characteristics of ocean surface and their impact on near-nadir InSAR’s precision are investigated. The motion error theoretical model is established combining the characteristics of the ocean surface and InSAR working mechanism, and the electromagnetic bias and layover bias are also taken into consideration.