机构

• 上海光学精密机械研究... [2]
• 国家空间科学中心 [1]
• 长春光学精密机械与物... [1]
• 数学与系统科学研究院 [1]
• 软件研究所 [1]
• 国家授时中心 [1]
• 更多

采集方式

• OAI收割 [7]

内容类型

• 期刊论文 [4]
• 会议论文 [2]
• 学位论文 [1]

发表日期

• 2020 [2]
• 2018 [1]
• 2010 [1]
• 2008 [2]

学科主题

• 光学工程 [1]

筛选

浏览/检索结果: 共7条，第1-7条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序作者升序作者降序 Compressed Coding, AMP-Based Decoding, and Analog Spatial Coupling 期刊论文  OAI收割 IEEE TRANSACTIONS ON COMMUNICATIONS, 2020, 卷号: 68, 期号: 12, 页码: 7362-7375 作者:  Liang, Shansuo;  Liang, Chulong;  Ma, Junjie;  Ping, Li   |  收藏  |  浏览/下载：127/0  |  提交时间：2021/04/26 Decoding  Error correction  Encoding  Error correction codes  Signal to noise ratio  Modulation  Compressed sensing  Compressed sensing  forward error control coding  approximate message passing  state evolution  area theorem and analog spatial-coupling   eLoran系统新型数据调制/信道编码方案设计与评估 期刊论文  OAI收割 全球定位系统, 2020, 卷号: 45, 期号: 5, 页码: 84 作者:  李婉清;  王建辉;  李实锋;  傅其祥   |  收藏  |  浏览/下载：20/0  |  提交时间：2021/11/29 enhanced Loran navigation system  data modulation  channel coding  performance assessment  transmission rate  增强罗兰导航系统  数据调制  信道编码  性能评估  传输速率   Doppler-robust high-spectrum-efficiency VCM-OFDM scheme for low Earth orbit satellites broadband data transmission 期刊论文  OAI收割 IET COMMUNICATIONS, 2018, 卷号: 12, 期号: 1, 页码: 35-43 作者:  Li, Jionghui;  Xiong, Weiming;  Sun, Geng;  Wang, Zhugang;  Huang, Yonghui   |  收藏  |  浏览/下载：77/0  |  提交时间：2018/03/02 Satellite Ground Stations  Satellite Links  Radio Receivers  Radio Transmitters  Ofdm Modulation  Modulation Coding  Doppler Shift  Filtering Theory  Doppler-robust High-spectrum-efficiency Vcm-ofdm Scheme  Low Earth Orbit Satellites Broadband Data Transmission  High-efficiency Satellite-ground Downlink Data Transmission System  Limited Spectrum Resource  Dynamic Link Conditions  Orbital Motion  Leo Satellite  Variable Coding Modulated Orthogonal Frequency Division Multiplexing  Satellite On-board Transmitter  Ground Station Receiver  Filtered-ofdm Signal  Adjustable Codmod  Spectral Efficiency  Physical Layer Frame Structure  Doppler Frequency Shift Compensation  Future Gigabit X-band Reliable Satellite-ground Downlink Transmissions   Design and image restoration research of a cubic-phase-plate system (EI CONFERENCE) 会议论文  OAI收割 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, April 26, 2010 - April 29, 2010, Dalian, China 作者:  Zhang J.;  Zhang J.;  Zhang J.;  Shi G.;  Zhang X. 收藏  |  浏览/下载：28/0  |  提交时间：2013/03/25 Wave-front coding technology is a novel jointly optical and digital imaging technology which can greatly extend the depth of focus of optical systems. The image restoration process is an important part of wave-front coding technology. Using wave-front coding makes the modulation transfer function(MTF) values of the optical systems change little over a range of several times the depth of focus  which means the system MTF is quite insensitive to defocus  and there is no zero in the passband. So we can design a single filter for the restoration of images in different defocus positions. However  it's hard to avoid noise during image acquisition and transmission processes. These noises will be amplified in the image restoration  especially in the high frequency part when the MTF drop is relatively low. The restoration process significantly reduces the system signal to noise ratio this way. Aimed at the problem of noise amplification  a new algorithm was proposed which incorporated wavelet denoising into the iterative steps of Lucy-Richardson algorithm. Better restoration results were obtained through the new algorithm  effectively solving the noise amplification problem of original LR algorithm. Two sets of identical triplet imaging systems were designed  in one of which the cubic-phase-plate was added. Imaging experiments of the manufactured systems were carried  and the images of a traditional system and a wave-front coded system before and after decoding were compared. The results show that the designed wave-front coded system can extend the depth of focus by 40 times compared with the traditional system while maintaining the light flux and the image plane resolution. 2010 Copyright SPIE - The International Society for Optical Engineering.   strengthening qim-based watermarking by non-uniform discrete cosine transform 会议论文  OAI收割 10th International Workshop on Information Hiding, Santa Barbara, CA, MAY 19-21, Zhao Xianfeng; Xia Bingbing; Deng Yi 收藏  |  浏览/下载：55/3  |  提交时间：2011/06/13 Acoustic noise measurement  Cosine transforms  Discrete cosine transforms  Image coding  Induction heating  Modulation  Power spectrum  Speech recognition  Technical presentations  Watermarking   基于RS编码及网格编码调制的光PPM通信纠错技术 期刊论文  OAI收割 光子学报, 2008, 卷号: 37, 期号: 7, 页码: 1361, 1364 梁波; 陈卫标 收藏  |  浏览/下载：1087/167  |  提交时间：2009/09/18 空间光通信  Communication performances  RS纠错码  Effective communications  TCM技术  External code  PPM调制  Numerical simulations  Optical channels  Optical communication systems  Optical-  PPM modulation  Reed-Solomon code  RS coding  Space optical communication  TCM  Trellis code modulations  Trellis-code modulation   相变存储材料光学特性的超快多阶调制研究 学位论文  OAI收割 作者:  温帅   |  收藏  |  浏览/下载：177/0  |  提交时间：2018/12/26 相变材料  phase-change material  皮秒激光  picosecond laser pulse  多阶编码  multi-level coding  并行调控  parallel modulation