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Network Coding-Based Retransmission for Relay Aided Multisource Multicast Networks
Vien, Quoc-Tuan,Tran, Le-Nam,Hong, Een-Kee Hindawi Publishing Corporation 2011 Eurasip Journal on Wireless Communications and Net Vol.2011 No.-
<P>This paper considers the reliable transmission for wireless multicast networks where multiple sources want to distribute information to a set of destinations with assistance of a relay. Basically, the reliability of a communication link is assured via automatic repeat request (ARQ) protocols. In the context of multisource multicast networks, the challenge is how to retransmit the lost or erroneous packets efficiently. In traditional approaches, the retransmission of lost packets from a single source is treated separately, and thus it may cause a considerable delay. To solve this problem, we propose the relay detects, combines, and forwards the packets which are lost at destinations using network coding. In the proposed ARQ protocol, the relay detects packets from different sources and combines the lost packets using NC. In particular, two packet-combination algorithms are developed to guarantee that all lost packets are retransmitted with the smallest number of retransmissions. Furthermore, we analyze the transmission bandwidth and provide the numerical results to demonstrate the superior performance of the proposed ARQ protocol over some existing schemes.</P>
Quoc-Tuan Vien,Dao-Tan-Hoang Nguyen,Le-Nam Tran,Een-Kee Hong 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper proposes a new distributed space-time block code (DSTBC) over frequency selective fading channels in amplify-and-forward (AF) turbo-coded cooperative wireless relay networks with hybrid automatic repeat request (HARQ) combining schemes. The proposed DSTBC and HARQ schemes are designed to achieve spatial diversity gain and low decoding complexity. These goals are obtained by precoding the received signal at the relay to form the conventional space-time block codes. In addition, the coding gain is combined with the diversity gain to enhance the performance of DSTBC by adding turbo coding at the source and iterative decoding at the destination. Together with turbo coding, two fundamental HARQ combining schemes are considered in our design, including Chase combining (CC) and incremental redundancy (IR).
Distributed Space-Time Block Code over Mixed Rayleigh and Rician Frequency-Selective Fading Channels
Vien, Quoc-Tuan,Tran, Le-Nam,Hong, Een-Kee Hindawi Publishing Corporation 2010 Eurasip Journal on Wireless Communications and Net Vol.2010 No.-
<P>This paper proposes a new distributed space-time block code (DSTBC) over frequency-selective fading channels for two-hop amplify and forward relay networks, consisting of a source node (S), two relay nodes (R1 and R2), and a destination node (D). The proposed DSTBC is designed to achieve maximal spatial diversity gain and decoupling detection of data blocks with a low-complexity receiver. To achieve these two goals, S uses zero-sequence padding, and relay nodes precode the received signals with a proper precoding matrix. The pairwise error probability (PEP) analysis is provided to investigate the achievable diversity gain of the proposed DSTBC for a general channel model in which one hop is modeled by Rayleigh fading and the other by Rician fading. This mixed Rayleigh-Rician channel model allows us to analyze two typical scenarios where {Ri} are in the neighborhood of either S or D.</P>
Chemical components from the leaves of Ardisia insularis and their cytotoxic activity
Nguyen Thi Hong Van,김승현,Trinh Anh Vien,Phan Van Kiem,Chau Van Minh,Nguyen Xuan Nhiem,Pham Quoc Long,Luu Tuan Anh,김난영,박선주 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.11
One new oleanane triterpene glycoside, ardinsuloside(1), and twelve known compounds, demethoxybergenin(2), norbergenin (3), bergenin (4), 4-O-galloylbergenin(5), quercitrin (6), myricitrin (7), myricetin 3-O-(300-O-galloyl)-a-L-rhamnopyranoside (8), desmanthine-2 (9), epicatechin3-O-galloyl ester (10), 30-methoxyepicatechin 3-Ogalloylester (11), gallic acid (12), and methyl galloate (13)were isolated from the leaves of Ardisia insularis. Theirstructures were established on the basis of spectral and chemicalevidence, which were in agreement with those reportedin literature. The cytotoxic activities of these compounds wereevaluated on three cancer cell lines namely A-549 (humanlung cancer), HT-29 (Human colon adenocarcinoma), andOVCAR (human ovarian carcinoma). The results revealedthat compound 1 inhibited A-549, HT-29, and OVCAR celllines with IC50 values of 8.5 ± 1.2, 16.4 ± 3.1, and13.6 ± 2.4 lM, respectively. The remaining compoundshowed weak cytotoxic activity. This result indicated thatcompound 1 could be useful in the treatment of cancer disease.