ID 原文 译文
56198 该机制通过集成基于多重哈希的维度划分策略和自适应累积回溯时间聚类策略分别学习数据流的空间和时间相关性,不需要预定义任何参数,能够根据数据流的动态变化趋势来自适应地调整隐私参数,从而保证了隐私保护机制的数据自适应性并有效提高了数据效用性. No longer predefiningparameters, AdaPub seamlessly incorporates two modules DimParti and AdaCluster to learn spatial and tempo?ral correlations simultaneously in a data-adaptive manner, thus ensuring data adaptability of privacy-preservingmechanism and greatly improving the data utility of the sanitized streams.
56199 此外,本文进一步提出了一种面向层次数据流发布的隐私保护机制HierAdaPub,利用最优隐私预算分配策略来最小化扰动方差以保证数据效用性. Moreover, for hierarchical aggregatedstreams publishing, we further propose a data-adaptive mechanism HierAdaPub that leverages an optimal privacybudget allocation strategy to minimize the total perturbation errors.
56200 大量仿真实验从不同角度均验证了所提出隐私保护机制能够在提供强隐私保护的同时,具有较高的数据效用性. Extensive experiments on real-world andsynthetic datasets demonstrate that our mechanisms substantially outperform the state-of-the-art solutions interms of both data utility and data adaptivity while achieving strong privacy guarantees.
56201 大规模MIMO阵列是第五代移动通信(5G)的关键技术之一. Massive MIMO is a key enabling technology of the fifth generation communication (5G).
56202 然而,阵列在经历了长时间工作之后,会出现部分通道失效的情况,从而对大规模MIMO阵列的辐射性能造成不同程度的影响. However,the transmitting/receiving channels of the massive MIMO array may fail after long-term continuous operation.
56203 本文针对5G毫米波大规模MIMO阵列中不同数量通道失效以及失效通道处于不同失效状态时的辐射特性进行了系统的仿真与实验研究,并在此基础上对MIMO阵列的辐射性能进行了统计分析. In this paper, systematic simulation and experimental studies on the radiation characteristics of arrays with different numbers of failed elements under different electrical statuses are performed. And statistical analysis is conducted based on these studies. The probabilistic model for the millimeter-wave 5G massive MIMO array is proposed.
56204 提出并建立了大规模MIMO阵列部分通道失效状态下的方向图参数概率模型,对概率模型的结果和统计分析的结果进行了对比,验证了概率模型的正确性和有效性,所给出的概率模型可以代替基于大量样本的仿真或实验结果进行统计分析的方法,对有不同比例的通道失效及不同失效状态时阵列的辐射特性进行快速评估,直接得出阵列主要辐射参数的期望值和方差. Also, the comparison between the results derived from the probabilistic model and statistical results is made to validate the correctness and effectiveness of the proposed probabilistic model. The proposed probabilistic model can be a substitute for the statistical analysis based on large numbers of samples. And it can be used for the fast evaluation of the radiation characteristics of arrays with different percentages of failed elements under different electrical statuses. By using this probabilistic model, the expectation and variance of main radiation characteristics can be obtained directly.
56205 此外,本文还分析了不同失效比例和状态下主要辐射特性的概率分布. Furthermore, the probability distribution of main radiation characteristics of arrays with different percentages of failed elements under different electrical statuses is also analyzed in this paper.
56206 围绕如何提高椭圆球面波（prolate spheroidal wave functions, PSWFs）多载波调制系统频带利用率,采用对PSWFs信号分组优化,利用信号索引与脉冲幅度调制进行两个维度的信息加载,在保证信号高能量聚集性的同时提高系统频带利用率的思路,提出了基于信号分组优化的PSWFs多载波调制方法.该方法依据信号路数、分组数,优选高能量聚集性PSWFs信号,保证信号波形具有高能量聚集性; To improve the spectral efficiency (SE) of multi-carrier modulation based on prolate spheroidal wave functions (PSWFs), a novel PSWFs multi-carrier modulation method based on signal grouping optimization is proposed. The proposed method performs group optimization on PSWFs signals, and conveys information by index modulation (IM) and pulse amplitude modulation (PAM), which can improve SE on the premise of ensuring high energy aggregation of the modulation signal. Firstly, according to the number of PSWFs signal and packets, the proposed method selects high-energy aggregation PSWFs signals to ensure that the signal waveform has high energy aggregation.
56207 采用I/Q 2个相互独立支路,同时利用信号索引、脉冲幅度调制进行信息加载,增加调制符号组合数,提高系统频带利用率.理论与仿真分析表明,本文所提方法相对于基于PSWFs的正交和非正交调制,在未明显降低信号功率谱、峰均功率比特性的前提下,能够有效提高系统频带利用率.如当误比特率为10-5时,所提方法相对于基于PSWFs的正交调制,以牺牲0. 05 dB的系统误码性能为代价,系统频带利用率可提升约18.2%;相对于基于PSWFs的非正交调制,系统频带利用率可提升约17%,同时系统误码性能提升约0. Secondly, the proposed method adopts I/Q independent branches, and uses IM and PAM for information loading, which aims to increase the number of modulation symbol combinations and improve SE. Firstly, according to the number of PSWFs signal and packets, the proposed method selects high-energy aggregation PSWFs signals to ensure that the signal waveform has high energy aggregation. Theoretical and simulation analysis shows that, compared with the multi-carrier orthogonal and non-orthogonal modulation based on PSWFs, the proposed method can effectively improve the system SE without significantly reducing the signal energy aggregation and peak-to-average power ratio.