期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
Linking temporal records 被引量:3
1
作者 Pei LI Xin Luna DONG +1 位作者 Andrea MAURINO Divesh SRIVASTAVA 《Frontiers of Computer Science》 SCIE EI CSCD 2012年第3期293-312,共20页
Many data sets contain temporal records which span a long period of time; each record is associated with a time stamp and describes some aspects of a real-world en- tity at a particular time (e.g., author information... Many data sets contain temporal records which span a long period of time; each record is associated with a time stamp and describes some aspects of a real-world en- tity at a particular time (e.g., author information in DBLP). In such cases, we often wish to identify records that describe the same entity over time and so be able to perform interest- ing longitudinal data analysis. However, existing record link- age techniques ignore temporal information and fall short for temporal data. This article studies linking temporal records. First, we ap- ply time decay to capture the effect of elapsed time on entity value evolution. Second, instead of comparing each pair of records locally, we propose clustering methods that consider the time order of the records and make global decisions. Ex- perimental results show that our algorithms significantly out- perform traditional linkage methods on various temporal data sets. 展开更多
关键词 temporal data record linkage data integration
原文传递
Novel schemes to generate multi-level modulation formats for ultra-capacity coherent detection transmission systems 被引量:2
2
作者 Jianjun Yu Xiang Zhou 《Chinese Optics Letters》 SCIE EI CAS CSCD 2010年第9期823-830,共8页
We summarize several novel schemes to generate multi-level modulation formats for high capacity transmission system with high spectral efficiency. We show that multi-level 8QAM, 16QAM, 32QAM, and 64QAM (QAM: quatlra... We summarize several novel schemes to generate multi-level modulation formats for high capacity transmission system with high spectral efficiency. We show that multi-level 8QAM, 16QAM, 32QAM, and 64QAM (QAM: quatlrature amplitude modulation) optical signals can be generated by commercial optical and electrical devices. Employing these multilevel modulation formats, we have realized PDM-8QAM (PDM: polarization division multiplexing) 32 Tb/s and PDM-36QAM 64-Tb/s signals transmission over 580-and 320-km fibers, respectively. 展开更多
关键词 Spectrum analyzers
原文传递
Digital signal processing for coherent multi-level modulation formats 被引量:3
3
作者 Xiang Zhou 《Chinese Optics Letters》 SCIE EI CAS CSCD 2010年第9期863-870,共8页
This paper presents a review on the recent progress of digital signal processing (DSP) in the high-speed optical transmission system using single-carrier based multi-level modulation formats. The principle of severa... This paper presents a review on the recent progress of digital signal processing (DSP) in the high-speed optical transmission system using single-carrier based multi-level modulation formats. The principle of several digital phase and polarization tracking algorithms recently proposed and demonstrated for future spectrally-efficient optical transmission system are discussed in detail. A novel DSP-based interference mitigation algorithm for the single-ended coherent receiver has been included. Recent technology advance on transmitter-side DSP such as digital pulse-shaping, pre-equalization and digital nonlinear compensation has also been discussed. 展开更多
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部