Optimal pilot design for OFDM systems with non-contiguous subcarriers based on semi-definite programming

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• 作者：Weiqiang Pan ; Zhilong Shan ; Ting Chen ; Fangjiong Chen…
• 关键词：Channel estimation ; Least square ; OFDMA ; Power allocation
• 刊名：Telecommunication Systems
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：63
• 期：2
• 页码：297-305
• 全文大小：1,011 KB
• 刊物类别：Business and Economics
• 刊物主题：Economics
  Business Information Systems
  Computer Communication Networks
  Artificial Intelligence and Robotics
  Probability Theory and Stochastic Processes
  
• 出版者：Springer Netherlands
• ISSN：1572-9451
• 卷排序：63

文摘

In this paper we consider OFDM systems with non-contiguous subcarriers where distributed spectrum fragments are applicable for transmission. A new model is proposed for pilot optimization with respect to location and power. The least-square approach is applied for channel estimation at the receiver and the optimization objective is to minimize the mean square error of the channel estimation. This optimization problem is then formulated as minimizing the spread of the eigenvalues of a positive semidefinite matrix, which is a typical semidefinite programming problem, and hence it can be solved with conventional interior-point method. Simulation results show the efficiency of the proposed algorithm.