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Massive MIMO Full-Duplex Relaying with Hardware Impairments
Wei Xie,Xiaochen Xia,Youyun Xu,Kui Xu,YurongWang 한국통신학회 2017 Journal of communications and networks Vol.19 No.4
Massive multiple-input-multiple-output full-duplex relaying(MM-FDR), which exploits both the benefits of large-scaleantenna arrays and full-duplex transmission, is considered as apromising technology to achieve very high spectral efficiency inthe future wireless network. Despite the inevitable presence oftransceiver impairments due to the use of low-cost hardware components,most of the prior works on MM-FDR assume perfecttransceiver hardware which is unrealistic in practice. This paperinvestigates the impact of hardware impairments on the MM-FDR. Based on the recent experimental results, the effect of hardware impairmentsis modeled using transmit and receive distortion noises. The end-to-end achievable rate is derived and the scaling behaviorsof echo interference due to the full-duplex operation, multi-userinterference and effective distortions caused by hardware impairmentsare obtained. The scaling results show that the achievablerate of MM-FDR is limited by the hardware impairments at thesources and destinations, instead of that at the relay or other interferences,as the number of relay antenna tends to infinity. Alow-complexity power control scheme is proposed to further improvethe energy efficiency of MM-FDR with hardware impairments. Simulation results show that the proposed scheme can improvethe spectral-energy efficiency tradeoff significantly.
A New C-10 Acetylene and A New Triterpenoid from Conyza canadensis
Xie, Wei-Dong,Gao, Xue,Jia, Zhong Jian 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.5
From the whole plants of Conyza canadensis (Compositae), a new C-10 acetylene, namely 8R, 9R-dihydroxymatricarine methyl ester (1), and a new triterpenoid, namely 3${\beta}$ 16${\beta}$, 20${\beta}$-trihydroxytaraxast-3-O-palmitoxyl ester (4), were isolated along with eleven known compounds(2, 3, 5-13). The structures of all 13 compounds were elucidated on the basis of their spectral data. The antibacterial activities of compounds 1-3 were evaluated.
Wei Xie 대한전기학회 2008 International Journal of Control, Automation, and Vol.6 No.2
An improved linear matrix inequality (LMI) representation of delay-independent H2 performance analysis is introduced for linear delay systems with delays of any size. Based on this representation we propose a new H₂ memoryless state feedback design. By introducing a new matrix variable, the new LMI formulation enables us to parameterize memoryless controllers without involving the Lyapunov variables in the formulations. By using a parameter-dependent Lyapunov function, this new representation proposed here provides us the results with less conservatism.
Prognostic Value of Pretreatment Serum Alkaline Phosphatase in Nasopharyngeal Carcinoma
Xie, Ying,Wei, Zheng-Bo,Duan, Xu-Wei Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.8
Background: The prognostic value of serum alkaline phosphatase (S-ALP) has not been fully validated for nasopharyngeal carcinoma (NPC). Materials and Methods: S-ALP levels were measured in 601 patients newly diagnosed with NPC before radical treatment, and possible associations of these levels with 5-year overall survival (OS) and tumor-free survival (TFS) were explored using univariate and multivariate analyses. Results: Elevated pretreatment S-ALP (>85 U/L) was significantly less frequent among patients classified as T1+2 or stage I+II than among those classified as T3+4 or stage III+IV. Multivariate analysis showed that elevated pretreatment S-ALP (>85 U/L), age, T classification and N stage were independent predictors of poor OS and TFS. Conclusions: Pretreatment S-ALP may be a reliable biomarker to evaluate the long-term prognosis of patients with NPC.