Cooperative communication can enhance the performance of wireless networks via relays, and so how to allocate the relay to obtain the optimal performance of system is a key issue. In this article, we consider a cooper...Cooperative communication can enhance the performance of wireless networks via relays, and so how to allocate the relay to obtain the optimal performance of system is a key issue. In this article, we consider a cooperative system where two users communicate with the destination via relays, and these relays connect with the destination by cable. Through the theoretical derivation and analysis, we obtain the optimal relay allocation strat- egy based on the maximum rate under the condition of relays setting forwarding thresholds. The result shows that the system has the maximum transmission rate when the relays are allocated equivalently between users. Moreover, compared with the single-user system, the results prove that diversity gain has a decisive effect on the performance in low SNR. However, with the SNR increasing, the impact of diversity gain on system rate will be reduced. In high SNR, spatial freedom degree of the channel of multiple users is brought to enhance the performance instead of diversity gain. Numerical results demonstrate the validity of the allocation strategy and conclusion arrived in this study, but we do not find the similar arguments in the literature so far, for comparison with the conclusion of this study.展开更多
Super-enhancers are regions of the mammalian genome comprising multiple enhancers in close proximity and often enriched at cancer genes.^(1)Recent studies suggest the emerging roles of super-enhancer-associated genes ...Super-enhancers are regions of the mammalian genome comprising multiple enhancers in close proximity and often enriched at cancer genes.^(1)Recent studies suggest the emerging roles of super-enhancer-associated genes in un-derlying the cell identity of neuroblastoma(NB)2 which rises from neural crest-derived cells and is one of the most common malignant solid tumors in children.展开更多
基金supported by the National Natural Science Foundation of China under Grant numbers 61032002,61101090, and 60902026the Chinese Important National Science & Technology Specific Projects under Grant number 2011ZX03001-007-01
文摘Cooperative communication can enhance the performance of wireless networks via relays, and so how to allocate the relay to obtain the optimal performance of system is a key issue. In this article, we consider a cooperative system where two users communicate with the destination via relays, and these relays connect with the destination by cable. Through the theoretical derivation and analysis, we obtain the optimal relay allocation strat- egy based on the maximum rate under the condition of relays setting forwarding thresholds. The result shows that the system has the maximum transmission rate when the relays are allocated equivalently between users. Moreover, compared with the single-user system, the results prove that diversity gain has a decisive effect on the performance in low SNR. However, with the SNR increasing, the impact of diversity gain on system rate will be reduced. In high SNR, spatial freedom degree of the channel of multiple users is brought to enhance the performance instead of diversity gain. Numerical results demonstrate the validity of the allocation strategy and conclusion arrived in this study, but we do not find the similar arguments in the literature so far, for comparison with the conclusion of this study.
基金supported by The National Natural Science Foundation of China(No.81770145,81802499,81971867,81970163,81902534,82072767,52003183,82141110)Natural Science Foundation of Jiangsu Province,China(No.SBK2019021442,BK20190185,BK20190186,BK20191175)+7 种基金The Universities Natural Science Foundation of Jiangsu Province,China(No.16KJB310014)Jiangsu province’s science and technology support program(Social Development)project,China(No.BE2021657,BE2021654)Jiangsu Province Key R&D Program(Social Development)Projects,China(No.BE2020659)Department of Pediatrics Clinical Center of Suzhou,China(No.Szzx201504)Gusu Health Talents program of Soochow city,China(No.2020-104)The Applied Foundational Research of Medical and Health Care of Suzhou City,China(No.SYS2019080,SYS2019082,SYS2019077,SYS2020150,SYS2020151,GSWS2020039)The Science and Technology Development Project of Suzhou City,China(No.SKJY2021111,a SKJY2021112)The Science and Technology Project of Soochow,China(No.SS2019011).
文摘Super-enhancers are regions of the mammalian genome comprising multiple enhancers in close proximity and often enriched at cancer genes.^(1)Recent studies suggest the emerging roles of super-enhancer-associated genes in un-derlying the cell identity of neuroblastoma(NB)2 which rises from neural crest-derived cells and is one of the most common malignant solid tumors in children.
