Outage Performance for DF Two-Way Relaying with Co-Channel Interference over Nakagami-m Fading

( Jinhong Fan ),( Chaowei Yuan ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.11

In this paper, we investigate the outage performance of a two-way decode-and-forward relaying network in an interference-limited Nakagami-m fading environment. More specifically, assuming the presence of Nakagami-m faded multiple co-channel interferers at the source/destination terminals, the closed-form approximate expression for the outage probability is derived by using moment-based estimators attaining the appropriate Nakagami-m fading parameter. Simulation results demonstrate that our analytical result is in excellent agreement with the Monte Carlo simulation.

Transmission Scheme for Asymmetric MIMO Two-way Relay with Channel Estimation Error

Jinhong Fan,Chaowei Yuan,Ke Xiao 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.7

In this paper, we consider the transmission scheme for asymmetric decode-and-forward (DF) multi-input multi-output (MIMO) two-way relay system with channel estimation error. In order to transmit with asymmetric data rates from the relay to the receivers according to their individual link qualities, we propose a novel transmission scheme for the broadcast phase by employing a priori bit information. The proposed scheme employs multi-antenna and network coding at the relay. The idea is the weaker link receiver exploits a priori bit information in each transmit symbol, so that it only needs to decode on a subset of the transmit symbol constellation. Subject to the same bit error rate constraint, the weaker link receiver can decode at lower signal-to-noise ratio compared to the stronger link. The different signal labeling used for mapping bits to symbols at the relay cause different minimum Euclidean distance, so it is shown to be crucial for the performance at the receivers. Subsequently, we investigate the effect of the channel estimation error on the system performance. Simulations show that the proposed transmission scheme can be applied to practical scenarios with asymmetric channel qualities.

Re: Effect of BKCa Channel Opener LDD175 on Erectile Function in an In Vivo Diabetic Rat Model

Li, Jinhong,Yang, Xingliang,Yuan, Jiuhong Elsevier 2017 The journal of sexual medicine Vol.14 No.4

Enhanced Thermal Properties of Epoxy Composites by Using Hyperbranched Aromatic Polyamide Grafted Silicon Carbide Whiskers

Zhengkai Yuan,Jinhong Yu,Baolin Rao,Hua Bai,Nan Jiang,Jian Gao,Shaorong Lu 한국고분자학회 2014 Macromolecular Research Vol.22 No.4

In this report, we demonstrate that the thermal conductivity, glass transition temperature, thermal stabilityand dynamical mechanical properties of epoxy composites could all be improved by incorporating hyperbranchedaromatic polyamide grafted silicon carbide (SiC-HBP) whiskers, using a solution method. The morphology andthermal properties of these newly modified epoxy composites were systematically analyzed and studied. Fouriertransform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR), and thermal gravimetricanalyses (TGA) proved hyperbranched aromatic polyamide grafted SiC whiskers were successfully prepared bysolution polymerization. The thermal conductivity of epoxy composite with 30 wt% of SiC-HBP had 2-fold improvement,compared to that of the neat epoxy. Besides, the glass transition temperatures (Tg) and dynamical mechanicalproperties of the epoxy composites were also raised by the addition of SiC-HBP, which indicates strong interfacialadhesion between SiC-HBP and the epoxy matrix. Most importantly, the incorporation of SiC-HBP in the epoxymatrix could effectively improve the thermal stability of the epoxy composites, according to our thermogravimetricanalysis (TGA).

Physical Layer Security in Heterogeneous Cellular Networks

Hui-Ming Wang,Tong-Xing Zheng,Jinhong Yuan,Towsley, Don,Moon Ho Lee IEEE 2016 IEEE TRANSACTIONS ON COMMUNICATIONS Vol.64 No.3

<P>The heterogeneous cellular network (HCN) is a promising approach to the deployment of 5G cellular networks. This paper comprehensively studies physical layer security in a multitier HCN where base stations (BSs), authorized users, and eavesdroppers are all randomly located. We first propose an access threshold-based secrecy mobile association policy that associates each user with the BS providing the maximum truncated average received signal power beyond a threshold. Under the proposed policy, we investigate the connection probability and secrecy probability of a randomly located user and provide tractable expressions for the two metrics. Asymptotic analysis reveals that setting a larger access threshold increases the connection probability while decreases the secrecy probability. We further evaluate the network-wide secrecy throughput and the minimum secrecy throughput per user with both connection and secrecy probability constraints. We show that introducing a properly chosen access threshold significantly enhances the secrecy throughput performance of a HCN.</P>

Physical Layer Security in Wireless Ad Hoc Networks Under A Hybrid Full-/Half-Duplex Receiver Deployment Strategy

Tong-Xing Zheng,Hui-Ming Wang,Jinhong Yuan,Zhu Han,Moon Ho Lee INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS 2017 IEEE Transactions on Wireless Communications Vol. No.

<P>This paper studies physical layer security in a wireless ad hoc network with numerous legitimate transmitter-receiver pairs and eavesdroppers. A hybrid full-duplex (FD)/half-duplex receiver deployment strategy is proposed to secure legitimate transmissions, by letting a fraction of legitimate receivers work in the FD mode sending jamming signals to confuse eavesdroppers upon their information receptions, and letting the other receivers work in the half-duplex mode just receiving their desired signals. The objective of this paper is to choose properly the fraction of FD receivers for achieving the optimal network security performance. Both accurate expressions and tractable approximations for the connection outage probability and the secrecy outage probability of an arbitrary legitimate link are derived, based on which the area secure link number, network-wide secrecy throughput, and network-wide secrecy energy efficiency are optimized, respectively. Various insights into the optimal fraction are further developed, and its closed-form expressions are also derived under perfect self-interference cancellation or in a dense network. It is concluded that the fraction of FD receivers triggers a non-trivial tradeoff between reliability and secrecy, and the proposed strategy can significantly enhance the network security performance.</P>

Multi-Antenna Transmission With Artificial Noise Against Randomly Distributed Eavesdroppers

Tong-Xing Zheng,Hui-Ming Wang,Jinhong Yuan,Towsley, Don,Moon Ho Lee Institute of Electrical and Electronics Engineers 2015 IEEE Transactions on Communications Vol. No.

<P>In this paper, we study the secure multi-antenna transmission with artificial noise (AN) under slow fading channels coexisting with randomly located eavesdroppers. We provide a comprehensive secrecy performance analysis and system design/optimization under a stochastic geometry framework. Specifically, we first evaluate the secrecy outage performance, and derive a closed-form expression for the optimal power allocation ratio of the information signal power to the total transmit power that minimizes the secrecy outage probability (SOP). Subject to a SOP constraint, we then propose a dynamic parameter transmission scheme (DPTS) and a static parameter transmission scheme (SPTS) to maximize secrecy throughput, and provide explicit solutions on the optimal transmission parameters, including the wiretap code rates, the on-off transmission threshold and the power allocation ratio. Our results give new insight into secure transmission designs. For example, secrecy rate is a concave function of the power allocation ratio in DPTS, and AN plays a significant role under SOP constraints and in dense eavesdropper scenarios. In SPTS, transmission probability is a concave function of the power allocation ratio, and secrecy throughput is a quasi-concave function of the secrecy rate. Numerical results are demonstrated to validate our theoretical analysis.</P>

HCV-Specific Interleukin-21+CD4+ T Cells Responses Associated with Viral Control through the Modulation of HCV-Specific CD8+ T Cells Function in Chronic Hepatitis C Patients

Guo-Hua Feng,Fu-Sheng Wang,Ji-Yuan Zhang,Qing-Lei Zeng,Lei Jin,Junliang Fu,Bin Yang,Ying Sun,Tianjun Jiang,Xiangsheng Xu,Zheng Zhang,Jinhong Yuan,Liyuan Wu 한국분자세포생물학회 2013 Molecules and cells Vol.36 No.4

Interleukin-21 (IL-21)+CD4+ T cells are involved in the immune response against hepatitis B virus (HBV) by secreting IL-21. However, the role of IL-21+CD4+ T cells in the immune response against chronic hepatitis C (CHC) virus infection is poorly understood. This study aimed to investigate the role of IL-21+CD4+ T cells in CHC patients and the potential mechanisms. The study subjects in-cluded nineteen CHC patients who were grouped by viral load (low, < 106 RNA copies/ml, n = 8; high, > 106 RNA copies/ml, n = 11). The peripheral frequency of HCV-specific IL-21+CD4+ T cells was higher in the low viral load group and was negatively correlated with the serum HCV RNA viral load in all CHC patients. Meanwhile, IL-21+ cells accumulated in the liver in the low viral load group. In vitro, IL-21 treatment increased the expression of proliferation markers and cytolytic molecules on HCV-specific CD8+ T cells. In summary, these findings suggest that HCV-specific IL-21+CD4+ T cells might contribute to HCV control by rescuing HCV-specific CD8+ T cells in CHC patients.