Orthogonal Time Frequency Space Modulation in 6G Era

Over the past decades, wireless technologies with reliable data transmissions and precise sensing ability in hostile environments are much less understood and significantly under-developed. The DD domain waveform, e.g., orthogonal time frequency space(OTFS), has been recognized globally for its great potential to achieve high-reliable communications and robust sensing performance under various channel conditions in 6G era.

Cloing and Bioinformatics Analysis of ndk Gene from Vibrio alginolyticus

[Objectives]The paper was to clone and analyze bioinformatics of ndk gene from Vibrio alginolyticus.[Methods]A pair of specific primers was designed based on the ndk gene sequence of V.alginolyticus HY9901.The full length of ndk gene was amplified by PCR and bioinformatics analysis was performed.MEGA 5.0 software was used to construct NDK phylogenetic tree by neighbor-joining method.SWISS-MODEL program was used to obtain the three-dimensional structural model of single subunit from NDK protein.[Results]The ndk gene,molecular structural formula C702H1094N192O214S7,was 426 bp in total,encoding 141 amino acids,with the theoretical molecular weight of 15.87199 kD and the theoretical pI value of 5.13.The prediction results of protein subcellular localization,SignalP 5.0,TMHMM Server 2.0 and SoftBerry-Psite showed that NDK mainly existed in the cytoplasm,and the protein was unstable and hydrophobic.There was neither signal peptide cleavage site,nor transmembrane region and KEGG metabolic pathway.The amino acid sequence had two protein kinase C phosphorylation sites,a casein kinaseⅡphosphorylation site,a N-myristoylation site,three microbody C-terminal target signal sites,and a nucleoside diphosphate kinase active site.Homology analysis showed that the NDK of V.alginolyticus had high homology with that of V.diabolicus,with a similarity of 98.58%.Analysis of the structural functional domain revealed that the protein had one NDK structural functional domain.The prediction results of secondary structure showed that theα-helix,random coil,β-sheet and extended strand accounted for 53.19%,28.37%,7.09%and 11.35%,respectively.Analysis of NDK protein via STRING database demonstrated that the proteins interacting with NDK protein were NrdA,NrdB,GmK,CmK,TmK,PyrG,PyrH,RelA,FolE and SpoT.[Conclusions]The study plays a positive role in the prevention and control of vibriosis and the improvement of the current aquaculture environment.

面向6G的智能机器通信与网络

随着智慧城市、智能制造等产业的快速发展,机器类通信得到学术界和产业界的广泛关注。机器类通信网络的功能集成化、智能化程度越来越高,对网络的时延、可靠性、连接设备数、峰值速率、安全性和可扩展性等指标提出了更严苛的要求。总结分析了4G、5G至未来6G时代的机器类通信网络需求的变化以及相应网络架构与关键技术的演化,在此基础上提出了面向6G机器类通信网络的感传算一体化智能机器通信网络架构。

Joint Radar and Communication: A Survey

Joint radar and communication(JRC)technology has become important for civil and military applications for decades.This paper introduces the concepts,characteristics and advantages of JRC technology,presenting the typical applications that have benefited from JRC technology currently and in the future.This paper explores the state-of-the-art of JRC in the levels of coexistence,cooperation,co-design and collaboration.Compared to previous surveys,this paper reviews the entire trends that drive the development of radar sensing and wireless communication using JRC.Specifically,we explore an open research issue on radar and communication operating with mutual benefits based on collaboration,which represents the fourth stage of JRC evolution.This paper provides useful perspectives for future researches of JRC technology.

Load-Aware Offloading Strategy in Two-Tier Heterogeneous Network

Although small cell offloading technology can alleviate the congestion in macrocell, aggressively offloading data traffic from macrocell to small cell can also degrade the performance of small cell due to the heavy load. Because of collision and backoff, the degradation is significant especially in network with contention-based channel access, and finally decreases throughput of the whole network. To find an optimal fraction of traffic to be offloaded in heterogeneous network, we combine Markov chain with the Poisson point process model to analyze contention-based throughput in irregularly deployment networks. Then we derive the close-form solution of the throughput and find that it is a function of the transmit power and density of base stations.Based on this, we propose the load-aware offloading strategies via power control and base station density adjustment. The numerical results verify our analysis and show a great performance gain compared with non-load-aware offloading.

Molecular Cloning and Bioinformatics Analysis of crp Gene in Vibrio alginolyticus

[Objectives]The crp gene in Vibrio alginolyticus was studied.[Methods]The crp gene of V.alginolyticus HY9901 was cloned and analyzed by bioinformatics.[Results]The ORF of the crp gene is 633 bp long and the predicted amino acid sequence encompasses 210 amino acid residues.The physicochemical property analysis indicated that the chemical formula of CRP is C_(1051)H_(1704)N_(290)O_(308)S_(10) with a molecular weight of 23.6514 kDa,and its theoretical pI is 7.74.Besides,the protein is stable and hydrophilic.The protein had three protein kinase C phosphorylation site,three casein kinase II phosphorylation site,one N-terminal myristoylation site.The BLAST analysis on the sequence revealed high homology with CRPs in other Vibrio species,and particularly the sequence shares about a homology of 99.52%with the CRP in V.parahaemolyticus.The SWISS-MODEL software simulated the subunit tertiary structural model of the CRP,and the similarity with template 3hif.1.A was 95.71%.[Conclusions]This study provides a reference for the search for efficient protective antigens against vibrosis.

通信感知一体化的信息理论极限

无线感知已成为通信产业界广泛公认的、下一代无线网络中的原生能力.通信感知一体化将通信和感知功能集成在同一个无线系统中,能够提高资源利用率,减少基础设施开销,并增强通信和感知各自的性能.通信与感知间的性能折衷是通感一体化的关键基础理论问题之一.本文首先指出通感性能极限和可达性能边界是研究通感性能折衷的重要手段,然后从容量–失真理论、基于均方误差的通感性能边界理论、基于感知等效速率的通感性能边界理论,以及面向目标检测的通感性能边界理论4个方面出发,对相关的当前研究进展进行了详细总结与分析.文中指出通感性能折衷可进一步划分为确定–随机折衷和子空间折衷,并详细讨论了现有研究工作中与之相关的结论.在此基础上,讨论了基于实际的5G NR协议与帧结构的通感性能边界理论.最后,本文对通感一体化的信息理论极限中仍需关注和进一步研究的开放问题进行了总结.

Cognitive information metrics for cognitive wireless networks

Considering the dynamic changes and uncertainty features of the radio environment in cognitive wireless networks(CWNs),the environment cognition ability is critical for the performance evaluation of CWNs design and optimization.However,there are no effective metrics to evaluate the ability and gain of information cognition in CWNs from an information theory perspective.Therefore,the novel cognitive information concept is proposed and defined as a metric to evaluate the uncertainty of both the internal and external environments of one system that can be removed by other systems or nodes using cognitive radio techniques.As an intelligent wireless communication system that is aware of its surrounding radio,network,and user multi-domains environment,the more cognitive information it achieves,the higher level cognitive capability it is.In this paper,we define and analyze the mathematical features of cognitive information.Results reveal that the increase of cognitive information can improve the spectrum efficiency and reduce the interference probability simultaneously in CWNs.Thus cognitive information can be regarded as a metric for CWNs optimization.Finally,we apply the theory of cognitive information in the parameters optimization in energy detection and cooperative spectrum sensing.