Pub Date : 2024-01-01DOI: 10.23919/JCC.ja.2022-0437
Ke Wang, Baorui Feng, Jingui Zhao, Wenliang Lin, Zhongliang Deng, Dongdong Wang, Yi Cen, Genan Wu
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.
{"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}
Pub Date : 2024-01-01DOI: 10.23919/JCC.fa.2023-0380.202401
Shiyu Liang, Wei Chen, Zhongwen Sun, Ao Chen, Bo Ai
Massive machine type communication aims to support the connection of massive devices, which is still an important scenario in 6G. In this paper, a novel cluster-based massive access method is proposed for massive multiple input multiple output systems. By exploiting the angular domain characteristics, devices are separated into multiple clusters with a learned cluster-specific dictionary, which enhances the identification of active devices. For detected active devices whose data recovery fails, power domain nonorthogonal multiple access with successive interference cancellation is employed to recover their data via re-transmission. Simulation results show that the proposed scheme and algorithm achieve improved performance on active user detection and data recovery.
{"title":"Cluster-based massive access for massive MIMO systems","authors":"Shiyu Liang, Wei Chen, Zhongwen Sun, Ao Chen, Bo Ai","doi":"10.23919/JCC.fa.2023-0380.202401","DOIUrl":"https://doi.org/10.23919/JCC.fa.2023-0380.202401","url":null,"abstract":"Massive machine type communication aims to support the connection of massive devices, which is still an important scenario in 6G. In this paper, a novel cluster-based massive access method is proposed for massive multiple input multiple output systems. By exploiting the angular domain characteristics, devices are separated into multiple clusters with a learned cluster-specific dictionary, which enhances the identification of active devices. For detected active devices whose data recovery fails, power domain nonorthogonal multiple access with successive interference cancellation is employed to recover their data via re-transmission. Simulation results show that the proposed scheme and algorithm achieve improved performance on active user detection and data recovery.","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":"140522058","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}
Pub Date : 2024-01-01DOI: 10.23919/JCC.fa.2022-0602.202401
Qiuhua Lin, Dongya Shen, Lihui Wang, Zhiyong Luo
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.
{"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}
Pub Date : 2024-01-01DOI: 10.23919/JCC.fa.2021-0162.202401
Elavarasi Gunasekaran, Vanitha Muthuraman
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.
{"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}
Pub Date : 2024-01-01DOI: 10.23919/JCC.fa.2023-0069.202401
Jin Liu, Zan Li, Qiguang Miao, Li Yang
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.
{"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}
Pub Date : 2024-01-01DOI: 10.23919/JCC.fa.2023-0354.202401
Jiaqi Fang, Gang Sun, Wenjin Wang, Li You, Rui Ding
This paper investigates the low earth orbit (LEO) satellite-enabled coded compressed sensing (CCS) unsourced random access (URA) in orthogonal frequency division multiple access (OFDMA) framework, where a massive uniform planar array (UPA) is equipped on the satellite. In LEO satellite communications, unavoidable timing and frequency offsets cause phase shifts in the transmitted signals, substantially diminishing the decoding performance of current terrestrial CCS URA receiver. To cope with this issue, we expand the inner codebook with predefined timing and frequency offsets and formulate the inner decoding as a tractable compressed sensing (CS) problem. Additionally, we leverage the inherent sparsity of the UPA-equipped LEO satellite angular domain channels, thereby enabling the outer decoder to support more active devices. Furthermore, the outputs of the outer decoder are used to reduce the search space of the inner decoder, which cuts down the computational complexity and accelerates the convergence of the inner decoding. Simulation results verify the effectiveness of the proposed scheme.
本文研究了低地球轨道（LEO）卫星在正交频分多址（OFDMA）框架下的编码压缩传感（CCS）无源随机存取（URA），其中在卫星上配备了大规模均匀平面阵列（UPA）。在低地轨道卫星通信中，不可避免的定时和频率偏移会导致传输信号的相位偏移，从而大大降低当前地面 CCS URA 接收器的解码性能。为解决这一问题，我们使用预定义的时间和频率偏移来扩展内码本，并将内解码表述为一个可处理的压缩传感（CS）问题。此外，我们还利用了配备 UPA 的低地球轨道卫星角域信道的固有稀疏性，从而使外部解码器能够支持更多有源设备。此外，外层解码器的输出用于缩小内层解码器的搜索空间，从而降低了计算复杂度，加快了内层解码的收敛速度。仿真结果验证了所提方案的有效性。
{"title":"OFDMA-based unsourced random access in LEO satellite Internet of Things","authors":"Jiaqi Fang, Gang Sun, Wenjin Wang, Li You, Rui Ding","doi":"10.23919/JCC.fa.2023-0354.202401","DOIUrl":"https://doi.org/10.23919/JCC.fa.2023-0354.202401","url":null,"abstract":"This paper investigates the low earth orbit (LEO) satellite-enabled coded compressed sensing (CCS) unsourced random access (URA) in orthogonal frequency division multiple access (OFDMA) framework, where a massive uniform planar array (UPA) is equipped on the satellite. In LEO satellite communications, unavoidable timing and frequency offsets cause phase shifts in the transmitted signals, substantially diminishing the decoding performance of current terrestrial CCS URA receiver. To cope with this issue, we expand the inner codebook with predefined timing and frequency offsets and formulate the inner decoding as a tractable compressed sensing (CS) problem. Additionally, we leverage the inherent sparsity of the UPA-equipped LEO satellite angular domain channels, thereby enabling the outer decoder to support more active devices. Furthermore, the outputs of the outer decoder are used to reduce the search space of the inner decoder, which cuts down the computational complexity and accelerates the convergence of the inner decoding. Simulation results verify the effectiveness of the proposed scheme.","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":"140525347","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}
For the goals of security and privacy preservation, we propose a blind batch encryption- and public ledger-based data sharing protocol that allows the integrity of sensitive data to be audited by a public ledger and allows privacy information to be preserved. Data owners can tightly manage their data with efficient revocation and only grant one-time adaptive access for the fulfillment of the requester. We prove that our protocol is semanticallly secure, blind, and secure against oblivious requesters and malicious file keepers. We also provide security analysis in the context of four typical attacks.
{"title":"A blind batch encryption and public ledger-based protocol for sharing sensitive data","authors":"Zhiwei Wang, Nianhua Yang, Qingqing Chen, Wei Shen, Zhiying Zhang","doi":"10.23919/JCC.fa.2020-0640.202401","DOIUrl":"https://doi.org/10.23919/JCC.fa.2020-0640.202401","url":null,"abstract":"For the goals of security and privacy preservation, we propose a blind batch encryption- and public ledger-based data sharing protocol that allows the integrity of sensitive data to be audited by a public ledger and allows privacy information to be preserved. Data owners can tightly manage their data with efficient revocation and only grant one-time adaptive access for the fulfillment of the requester. We prove that our protocol is semanticallly secure, blind, and secure against oblivious requesters and malicious file keepers. We also provide security analysis in the context of four typical attacks.","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":"140521567","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}
Pub Date : 2024-01-01DOI: 10.23919/JCC.ja.2022-0409
Yilin Zhou, Guojun Peng, Zichuan Li, Side Liu
According to the boot process of modern computer systems, whoever boots first will gain control first. Taking advantage of this feature, a malicious code called bootkit can hijack the control before the OS bootloader and bypass security mechanisms in boot process. That makes bootkits difficult to detect or clean up thoroughly. With the improvement of security mechanisms and the emergence of UEFI, the attack and defense techniques for bootkits have constantly been evolving. We first introduce two boot modes of modern computer systems and present an attack model of bootkits by some sophistical samples. Then we discuss some classic attack techniques used by bootkits from their initial appearance to the present on two axes, including boot mode axis and attack phase axis. Next, we evaluate the race to the bottom of the system and the evolution process between bootkits and security mechanisms. At last, we present the possible future direction for bootkits in the context of continuous improvement of OS and firmware security mechanisms.
{"title":"A survey on the evolution of bootkits attack and defense techniques","authors":"Yilin Zhou, Guojun Peng, Zichuan Li, Side Liu","doi":"10.23919/JCC.ja.2022-0409","DOIUrl":"https://doi.org/10.23919/JCC.ja.2022-0409","url":null,"abstract":"According to the boot process of modern computer systems, whoever boots first will gain control first. Taking advantage of this feature, a malicious code called bootkit can hijack the control before the OS bootloader and bypass security mechanisms in boot process. That makes bootkits difficult to detect or clean up thoroughly. With the improvement of security mechanisms and the emergence of UEFI, the attack and defense techniques for bootkits have constantly been evolving. We first introduce two boot modes of modern computer systems and present an attack model of bootkits by some sophistical samples. Then we discuss some classic attack techniques used by bootkits from their initial appearance to the present on two axes, including boot mode axis and attack phase axis. Next, we evaluate the race to the bottom of the system and the evolution process between bootkits and security mechanisms. At last, we present the possible future direction for bootkits in the context of continuous improvement of OS and firmware security mechanisms.","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":"140518902","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}
Pub Date : 2024-01-01DOI: 10.23919/JCC.fa.2023-0357.202401
Chunlin Yan, Siying Lyu, Sen Wang, Yuhong Huang, Xiaodong Xu
In this paper, ambient IoT is used as a typical use case of massive connections for the sixth generation (6G) mobile communications where we derive the performance requirements to facilitate the evaluation of technical solutions. A rather complete design of unsourced multiple access is proposed in which two key parts: a compressed sensing module for active user detection, and a sparse interleaver-division multiple access (SIDMA) module are simulated side by side on a same platform at balanced signal to noise ratio (SNR) operating points. With a proper combination of compressed sensing matrix, a convolutional encoder, receiver algorithms, the simulated performance results appear superior to the state-of-the-art benchmark, yet with relatively less complicated processing.
{"title":"Design framework of unsourced multiple access for 6G massive IoT","authors":"Chunlin Yan, Siying Lyu, Sen Wang, Yuhong Huang, Xiaodong Xu","doi":"10.23919/JCC.fa.2023-0357.202401","DOIUrl":"https://doi.org/10.23919/JCC.fa.2023-0357.202401","url":null,"abstract":"In this paper, ambient IoT is used as a typical use case of massive connections for the sixth generation (6G) mobile communications where we derive the performance requirements to facilitate the evaluation of technical solutions. A rather complete design of unsourced multiple access is proposed in which two key parts: a compressed sensing module for active user detection, and a sparse interleaver-division multiple access (SIDMA) module are simulated side by side on a same platform at balanced signal to noise ratio (SNR) operating points. With a proper combination of compressed sensing matrix, a convolutional encoder, receiver algorithms, the simulated performance results appear superior to the state-of-the-art benchmark, yet with relatively less complicated processing.","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":"140520249","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}
Pub Date : 2024-01-01DOI: 10.23919/JCC.fa.2022-0237.202401
Hao Jiang, Hongming Zhang, Ting Liu
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.
{"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}
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