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New Design for Linear Complex Precoding over ABBA Quasi-Orthogonal Space-Time Block Codes
Ran Rong,안찬호,김동구,양장훈 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.12
codes, a class of quasi-orthognal space-time block codes (QoSTBC) proposed by Tirkkonen and others, allow full rate and a fast maximum likelihood (ML) decoding, but do not have full diversity. In this paper, a linear complex precoder is proposed for ABBA codes to achieve full rate and full diversity. Moreover, the same diversity produce as that of orthogonal space-time block code with linear complex precoder (OSTBC-LCP) is achieved. Meanwhile, the size of the linear complex precoder can be reduced by half without affecting performance, which means the same complexity of decoding as that of the conventional ABBA code is guaranteed.
New Design for Linear Complex Precoding over ABBA Quasi-Orthogonal Space-Time Block Codes
Rong Ran(란롱),Janghoon Yang(양장훈),Chan-ho An(안찬호),Dong Ku Kim(김동구) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.12C
ABBA codes, a class of quasi-orthognal space-time block codes (QoSTBC) proposed by Tirkkonen and others, allow full rate and a fast maximum likelihood (ML) decoding, but do not have full diversity. In this paper, a linear complex precoder is proposed for ABBA codes to achieve full rate and full diversity. Moreover, the same diversity produce as that of orthogonal space-time block code with linear complex precoder (OSTBC-LCP) is achieved. Meanwhile, the size of the linear complex precoder can be reduced by half without affecting performance, which means the same complexity of decoding as that of the conventional ABBA code is guaranteed.
Application of Genetic Algorithm for Large-Scale Multiuser MIMO Detection with Non-Gaussian Noise
Ran Rong 한국정보통신학회 2022 Journal of information and communication convergen Vol.20 No.2
Based on experimental measurements conducted on many different practical wireless communication systems, ambient noise has been shown to be decidedly non-Gaussian owing to impulsive phenomena. However, most multiuser detection techniques proposed thus far have considered Gaussian noise only. They may therefore suffer from a considerable performance loss in the presence of impulsive ambient noise. In this paper, we consider a large-scale multiuser multiple-input multiple-output system in the presence of non-Gaussian noise and propose a genetic algorithm (GA) based detector for large-dimensional multiuser signal detection. The proposed algorithm is more robust than linear multi-user detectors for non-Gaussian noise because it uses a multi-directional search to manipulate and maintain a population of potential solutions. Meanwhile, the proposed GA-based algorithm has a comparable complexity because it does not require any complicated computations (e.g., a matrix inverse or derivation). The simulation results show that the GA offers a performance gain over the linear minimum mean square error algorithm for both non-Gaussian and Gaussian noise.
Cell-Selective Metabolic Glycan Labeling Based on Ligand-Targeted Liposomes
Ran Xie,Senlian Hong,Lianshun Feng,Jie Rong,Xing Chen 한국당과학회 2012 한국당과학회 학술대회 Vol.2012 No.1
Cell-surface glycans play key roles in mediating various molecular recognition events; aberrant glycosylation is implicated in disease progression. Therefore, probing the dynamic changes of glycan biosynthesis and structures is of great importance for augmenting our understanding of glycobiology and improving disease diagnosis and therapeutics. The metabolic glycan labeling was an appealing approach to incorporate specially designed carbohydrate analogs into the glycans, which enables the detection and imaging of the glycans in cells and living animals. However, one major bottleneck of this method is cell- type selectivity. Herein, we present the cell-specific metabolic glycan labeling using ligand-targeted liposomes to deliver unnatural sugars to target cells in a cell-surface receptor dependent manner. In this strategy, sugar analogs are encapsulated in ligand-targeted liposomes. The ligands bind to specific cell-surface receptors that are only expressed or up-regulated in target cells, which mediate the intracellular delivery of azidosugars via endocytosis. The delivered azidosugars are metabolically incorporated into cell-surface glycans and detected or imaged using a bioorthogonal reaction. The application of this strategy includes the facile introduction of myriad alternative ligands, as well as the cell-specific or tissue-specific imaging and detection of glycosylation in vivo.