Hongzheng Wang

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—Cooperative communication is an effective technique which provides diversity gains to combat the attenuation of radio signals caused by fading and path loss. By sharing each cooperative node's antenna to form a virtual antenna array, the reliability of the wireless transmission can be significantly improved. On the other hand, cooperation among different(More)
—This paper investigates an optimal decentralized Space-Time Block Coding (STBC) transmission strategy given an overhead constraint. The design of protocols for a cooperative network is formulated as an optimization problem. By solving the proposed problem, M-group decentralized STBC is proved to be the optimal strategy when neither central control nor(More)
In order to obtain the biological active compound, α-mangostin, from the traditional native mangosteen (Garcinia mangostana L.), an extraction method for industrial application was explored. A high yield of α-mangostin (5.2%) was obtained by extraction from dried mangosteen pericarps with subsequent purification on macroporous resin HPD-400. The chemical(More)
An efficient microwave-assisted extraction (MAE) technique was employed in simultaneous extraction of luteolin and apigenin from tree peony pod. The MAE procedure was optimized using response surface methodology (RSM) and compared with other conventional extraction techniques of macerate extraction (ME) and heat reflux extraction (HRE). The optimal(More)
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