China Communications最新文献_第7页

Channel correlation based user grouping algorithm for nonlinear precoding satellite communication system 基于信道相关性的非线性预编码卫星通信系统用户分组算法

China Communications Pub Date : 2024-01-01 DOI: 10.23919/JCC.ja.2022-0437

Ke Wang, Baorui Feng, Jingui Zhao, Wenliang Lin, Zhongliang Deng, Dongdong Wang, Yi Cen, Genan Wu

{"title":"Channel correlation based user grouping algorithm for nonlinear precoding satellite communication system","authors":"Ke Wang, Baorui Feng, Jingui Zhao, Wenliang Lin, Zhongliang Deng, Dongdong Wang, Yi Cen, Genan Wu","doi":"10.23919/JCC.ja.2022-0437","DOIUrl":"https://doi.org/10.23919/JCC.ja.2022-0437","url":null,"abstract":"Low Earth Orbit (LEO) multibeam satellites will be widely used in the next generation of satellite communication systems, whose inter-beam interference will inevitably limit the performance of the whole system. Nonlinear precoding such as Tomlinson-Harashima precoding (THP) algorithm has been proved to be a promising technology to solve this problem, which has smaller noise amplification effect compared with linear precoding. However, the similarity of different user channels (defined as channel correlation) will degrade the performance of THP algorithm. In this paper, we qualitatively analyze the inter-beam interference in the whole process of LEO satellite over a specific coverage area, and the impact of channel correlation on Signal-to-Noise Ratio (SNR) of receivers when THP is applied. One user grouping algorithm is proposed based on the analysis of channel correlation, which could decrease the number of users with high channel correlation in each precoding group, thus improve the performance of THP. Furthermore, our algorithm is designed under the premise of co-frequency deployment and orthogonal frequency division multiplexing (OFDM), which leads to more users under severe inter-beam interference compared to the existing research on geostationary orbit satellites broadcasting systems. Simulation results show that the proposed user grouping algorithm possesses higher channel capacity and better bit error rate(BER) performance in high SNR conditions relative to existing works.","PeriodicalId":504777,"journal":{"name":"China Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140524476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cluster-based massive access for massive MIMO systems 基于集群的大规模 MIMO 系统大规模接入

China Communications Pub Date : 2024-01-01 DOI: 10.23919/JCC.fa.2023-0380.202401

Shiyu Liang, Wei Chen, Zhongwen Sun, Ao Chen, Bo Ai

引用次数: 1

An mmWave dual-band integrated substrate gap waveguide single cavity filter with frequency selectivity 具有频率选择性的毫米波双波段集成衬底间隙波导单腔滤波器

China Communications Pub Date : 2024-01-01 DOI: 10.23919/JCC.fa.2022-0602.202401

Qiuhua Lin, Dongya Shen, Lihui Wang, Zhiyong Luo

{"title":"An mmWave dual-band integrated substrate gap waveguide single cavity filter with frequency selectivity","authors":"Qiuhua Lin, Dongya Shen, Lihui Wang, Zhiyong Luo","doi":"10.23919/JCC.fa.2022-0602.202401","DOIUrl":"https://doi.org/10.23919/JCC.fa.2022-0602.202401","url":null,"abstract":"A novel dual-band ISGW cavity filter with enhanced frequency selectivity is proposed in this paper by utilizing a multi-mode coupling topology. Its cavity is designed to control the number of modes, and then the ports are determined by analyzing the coupling relationship between these selected modes. By synthesizing the coupling matrix of the filter, a non-resonating node (NRN) structure is introduced to flexibly tune the frequency of modes, which gets a dual-band and quad-band filtering response from a tri-band filter no the NRN. Furthermore, a frequency selective surface (FSS) has been newly designed as the upper surface of the cavity, which significantly improves the bad out-of-band suppression and frequency selectivity that often exists in most traditional cavity filter designs and measurements. The results show that its two center frequencies are f01 = 27.50 GHz and f02 = 32.92 GHz, respectively. Compared with the dual-band filter that there is no the FSS metasurface, the out-of-band suppression level is improved from measured 5 dB to 18 dB, and its finite transmission zero (FTZ) numbers is increased from measured 1 to 4 between the two designed bands. Compared with the tri-band and quad-band filter, its passband bandwidth is expanded from measured 1.17 %, 1.14 %, and 1.13 % or 1.31 %, 1.50 %, 0.56 %, and 0.57 % to 1.71 % and 1.87 %. In addition, the filter has compact, small, and lightweight characteristics.","PeriodicalId":504777,"journal":{"name":"China Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140522135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A new double layer multi-secret sharing scheme 一种新的双层多机密共享方案

China Communications Pub Date : 2024-01-01 DOI: 10.23919/JCC.fa.2021-0162.202401

Elavarasi Gunasekaran, Vanitha Muthuraman

{"title":"A new double layer multi-secret sharing scheme","authors":"Elavarasi Gunasekaran, Vanitha Muthuraman","doi":"10.23919/JCC.fa.2021-0162.202401","DOIUrl":"https://doi.org/10.23919/JCC.fa.2021-0162.202401","url":null,"abstract":"Cryptography is deemed to be the optimum strategy to secure the data privacy in which the data is encoded ahead of time before sharing it. Visual Secret Sharing (VSS) is an encryption method in which the secret message is split into at least two trivial images called ‘shares’ to cover it. However, such message are always targeted by hackers or dishonest members who attempt to decrypt the message. This can be avoided by not uncovering the secret message without the universal share when it is presented and is typically taken care of, by the trusted party. Hence, in this paper, an optimal and secure double-layered secret image sharing scheme is proposed. The proposed share creation process contains two layers such as threshold-based secret sharing in the first layer and universal share based secret sharing in the second layer. In first layer, Genetic Algorithm (GA)is applied to find the optimal threshold value based on the randomness of the created shares. Then, in the second layer, a novel design of universal share-based secret share creation method is proposed. Finally, Opposition Whale Optimization Algorithm (OWOA)-based optimal key was generated for rectange block cipher to secure each share. This helped in producing high quality reconstruction images. The researcher achieved average experimental outcomes in terms of PSNR and MSE values equal to 55.154225 and 0.79365625 respectively. The average PSNRwas less (49.134475) and average MSE was high (I) in case of existing methods.","PeriodicalId":504777,"journal":{"name":"China Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140525736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Adaptive bistable stochastic resonance based weak signal reception in additive Laplacian noise 基于自适应双稳态随机共振的加性拉普拉斯噪声中的微弱信号接收

China Communications Pub Date : 2024-01-01 DOI: 10.23919/JCC.fa.2023-0069.202401

Jin Liu, Zan Li, Qiguang Miao, Li Yang

{"title":"Adaptive bistable stochastic resonance based weak signal reception in additive Laplacian noise","authors":"Jin Liu, Zan Li, Qiguang Miao, Li Yang","doi":"10.23919/JCC.fa.2023-0069.202401","DOIUrl":"https://doi.org/10.23919/JCC.fa.2023-0069.202401","url":null,"abstract":"Weak signal reception is a very important and challenging problem for communication systems especially in the presence of non-Gaussian noise, and in which case the performance of optimal linear correlated receiver degrades dramatically. Aiming at this, a novel uncorrelated reception scheme based on adaptive bistable stochastic resonance (ABSR) for a weak signal in additive Laplacian noise is investigated. By analyzing the key issue that the quantitative cooperative resonance matching relationship between the characteristics of the noisy signal and the nonlinear bistable system, an analytical expression of the bistable system parameters is derived. On this basis, by means of bistable system parameters self-adaptive adjustment, the counterintuitive stochastic resonance (SR) phenomenon can be easily generated at which the random noise is changed into a benefit to assist signal transmission. Finally, it is demonstrated that approximately 8dB bit error ratio (BER) performance improvement for the ABSR-based uncorrelated receiver when compared with the traditional uncorrelated receiver at low signal to noise ratio (SNR) conditions varying from −30dB to −5dB.","PeriodicalId":504777,"journal":{"name":"China Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140525088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

OFDMA-based unsourced random access in LEO satellite Internet of Things 低地轨道卫星物联网中基于 OFDMA 的无源随机接入

China Communications Pub Date : 2024-01-01 DOI: 10.23919/JCC.fa.2023-0354.202401

Jiaqi Fang, Gang Sun, Wenjin Wang, Li You, Rui Ding

引用次数: 0

A blind batch encryption and public ledger-based protocol for sharing sensitive data 基于盲批量加密和公共分类账的敏感数据共享协议

China Communications Pub Date : 2024-01-01 DOI: 10.23919/JCC.fa.2020-0640.202401

Zhiwei Wang, Nianhua Yang, Qingqing Chen, Wei Shen, Zhiying Zhang

引用次数: 0

A survey on the evolution of bootkits attack and defense techniques Bootkits 攻击和防御技术演变概览

China Communications Pub Date : 2024-01-01 DOI: 10.23919/JCC.ja.2022-0409

Yilin Zhou, Guojun Peng, Zichuan Li, Side Liu

引用次数: 0

Design framework of unsourced multiple access for 6G massive IoT 面向 6G 大规模物联网的无源多址接入设计框架

China Communications Pub Date : 2024-01-01 DOI: 10.23919/JCC.fa.2023-0357.202401

Chunlin Yan, Siying Lyu, Sen Wang, Yuhong Huang, Xiaodong Xu

引用次数: 0

Novel sum-of-sinusoids simulation channel modeling for 6G multiple-input multiple-output vehicle-to-everything communications 用于 6G 多输入多输出车对车通信的新型正弦波总和模拟信道建模

China Communications Pub Date : 2024-01-01 DOI: 10.23919/JCC.fa.2022-0237.202401

Hao Jiang, Hongming Zhang, Ting Liu

{"title":"Novel sum-of-sinusoids simulation channel modeling for 6G multiple-input multiple-output vehicle-to-everything communications","authors":"Hao Jiang, Hongming Zhang, Ting Liu","doi":"10.23919/JCC.fa.2022-0237.202401","DOIUrl":"https://doi.org/10.23919/JCC.fa.2022-0237.202401","url":null,"abstract":"In this paper, a statistical cluster-based simulation channel model with a finite number of sinusoids is proposed for depicting the multiple-input multiple-output (MIMO) communications in vehicle-to-everything (V2X) environments. In the proposed sum-of-sinusoids (SoS) channel model, the waves that emerge from the transmitter undergo line-of-sight (LoS) and non-line-of-sight (NLoS) propagation to the receiver, which makes the model suitable for describing numerous V2X wireless communication scenarios for sixth-generation (6G). We derive expressions for the real and imaginary parts of the complex channel impulse response (CIR), which characterize the physical propagation characteristics of V2X wireless channels. The statistical properties of the real and imaginary parts of the complex CIRs, i.e., autocorrelation functions (ACFs), Doppler power spectral densities (PSDs), cross-correlation functions (CCFs), and variances of ACFs and CCFs, are derived and discussed. Simulation results are generated and match those predicted by the underlying theory, demonstrating the accuracy of our derivation and analysis. The proposed framework and underlying theory arise as an efficient tool to investigate the statistical properties of 6G MIMO V2X communication systems.","PeriodicalId":504777,"journal":{"name":"China Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140518336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0