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Articles by Liu Zunxiong
Total Records ( 2 ) for Liu Zunxiong
  Liu Zunxiong , Xu Zheng , Feng Xingle and Lu Zhaogan
  In current 4G system given in recent literatures, channel estimation overhead and complexity of Multi-User Detectors (MUD), may lead to bad performance in fast fading channel scenarios when large number of users exists. So, a novel 4G system with TDD/TDMA as duplex and wireless access is designed to reduce channel estimation spending and avoid MUD, as only one user can be active to communicate with base station. Under the requirement of 4G systems, radio frame structure is elaborately designed to fit for fast fading channel scenarios. The system architecture with consideration of link adaptations for a novel eigenmodes coupled universal space-time codes, is given and evaluated for performance of TDD/TDMA 4G systems. Results show the proposed TDD/TDMA 4G can meet the requirement of 4G system under the classical ITU channel profiles.
  Liu Zunxiong , Xie Xin and Zhang Deyun
  Minimax Probability Machine Regression (MPMR) is proposed for chaotic time series global prediction in this study. In MPMR, regression function maximizes the minimum probability that future predication will be within an |Å to the true regression function. Multi-step predictions up to 20 steps were done on Mackey-Glass chaotic time series with MPMR and Local Weighted Linear Regression (LWLR). The results demonstrate that MPMR have better prediction performance, compared with LWLR. Kernel function shape parameter and regression tube value will influence the MPMR-based system performance. In experiments, the cross validation methods are employed to choose the two parameters.
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