| 1 | Two-Hop Gaussian Relay Channel with Linear Relaying: Achievable Rate and Optimization Design显示文摘The relay node with linear relaying transmits the linear combination of its past received signals.The optimization of two-hop relay channel with linear relaying is discussed in this paper.The capacity for the two-hop Gaussian relay channel with linear relaying is derived,which can be formulated as an optimization problem over the relaying matrix and the covariance matrix of the signals transmitted at the source.It is proved that the solution to this optimization problem is equivalent to a 'single-letter' optimization problem.We also show that the solution to this 'single-letter' optimization problem has the same form as the expression of the rate achieved by Time-Sharing Amplify and Forward(TSAF).In order to solve this equivalent problem,we proposed an iterative algorithm.Simulation results show that if channel gain of one hop is relatively smaller,the achievable rate with TSAF is closer to the max-flow min-cut capacity bound,but at a lower complexity. | Deng Zhixiang Wang Baoyun Lang Fei Ma Yayan Liu Chen | 2012 | China Communications2012，9，2： | 1 |
| 2 | Simulation and experiment of six-bed PSA process for air separation with rotating distribution valve显示文摘In this work,a six-bed pressure swing adsorption(PSA)process was investigated to produce medical oxygen from air,which uses the combination of six-way rotating distribution valve and PSA and has the main advantage of effectively saving space compared to the traditional two-bed or four-bed PSA process and can obtain greater productivity.The mathematical model of adsorption beds was developed based on the separation mechanism and the interaction among different equipment.Moreover,a pilot-scale device has been constructed to verify the accuracy of mathematical model by experiment.The oxygen product conformed to the medical standard(>93%(vol))with a recovery of over 57%.Some related parameters were also discussed in detail,such as step time,ratio of length to the diameter,flow rate of product. | Tao Tian Yayan Wang Bing Liu Zhaoyang Ding Xinxi Xu Meisheng Shi Jun Ma Yanjun Zhang Donghui Zhang | 2022 | Chinese Journal of Chemical Engineering2022，35，2： | 1 |
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