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Generalized Joint Channel-Network Coding in Asymmetric Two-Way Relay Channels
( Shengqiang Shen ),( Shiyin Li ),( Zongyan Li ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.12
Combining channel coding and network coding in a physical layer in a fading channel, generalized joint channel-network coding (G-JCNC) is proved to highly perform in a two-way relay channel (TWRC). However, most relevant discussions are restricted to symmetric networks. This paper investigates the G-JCNC protocols in an asymmetric TWRC (A-TWRC). A newly designed encoder used by source nodes that is dedicated to correlate codewords with different orders is presented. Moreover, the capability of a simple common non-binary decoder at a relay node is verified. The effects of a power match under various numbers of iteration and code lengths are also analyzed. The simulation results give the optimum power match ratio and demonstrate that the designed scheme based on G-JCNC in an A-TWRC has excellent bit error rate performance under an appropriate power match ratio.
Generalized Joint Channel-Network Coding in Asymmetric Two-Way Relay Channels
Shen, Shengqiang,Li, Shiyin,Li, Zongyan Korean Society for Internet Information 2016 KSII Transactions on Internet and Information Syst Vol.10 No.12
Combining channel coding and network coding in a physical layer in a fading channel, generalized joint channel-network coding (G-JCNC) is proved to highly perform in a two-way relay channel (TWRC). However, most relevant discussions are restricted to symmetric networks. This paper investigates the G-JCNC protocols in an asymmetric TWRC (A-TWRC). A newly designed encoder used by source nodes that is dedicated to correlate codewords with different orders is presented. Moreover, the capability of a simple common non-binary decoder at a relay node is verified. The effects of a power match under various numbers of iteration and code lengths are also analyzed. The simulation results give the optimum power match ratio and demonstrate that the designed scheme based on G-JCNC in an A-TWRC has excellent bit error rate performance under an appropriate power match ratio.
Shengqiang Shen 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
A design of bi-ejector refrigeration system was presented by the authors. In the system there are two ejectors: one is to suck refrigerant steam from evaporator and discharge to condenser, the other is a jet pump which pumps liquid refrigerant from condenser to generator. With numerical computation, the two aspects are investigated: (1) the flow characteristics of flow field in ejector. (2) the matching characteristics of the two ejectors. The simulation shows that the discharge pressure of jet-pump could be higher than that of motive steam with proper entrainment ratio. On the given refrigeration condition, the higher the generator pressure, the lower the entrainment ratio of steam-liquid ejector, but the entrainment ratio of steam-steam ejector is higher. With suitable matching parameters of two ejectors, the optimal COP of the system could be achieved.
Simultaneous Impact of Multiple Droplets on Liquid Film
Gangtao Liang,Tianyu Zhang,Haibing Yu,Hongliang Chen,Shengqiang Shen 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.65 No.-
Multiple droplets impinging on a thin liquid film simultaneously is numerically studied using a three-dimensional model with an implement of a random disturbance subjected to Gaussian distribution. This model is very effective to predict droplet splashing under relatively high impingement momentum. Interface evolutions and field distributions are addressed after droplets impact. Besides, a geometric model is built up to demarcate the impact region into two semicircular regions and a series of rectangular regions during simultaneous impact, further to discuss the variations of area and residual film thickness in each region as well as the total area and average film thickness.