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

Weiqiang Pan (), Zhilong Shan (), Ting Chen (), Fangjiong Chen () and Jing Feng ()
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Weiqiang Pan: South China University of Technology
Zhilong Shan: South China Normal University
Ting Chen: Cancer Hospital of Shantou University Medical College
Fangjiong Chen: South China University of Technology
Jing Feng: South China University of Technology

Telecommunication Systems: Modelling, Analysis, Design and Management, 2016, vol. 63, issue 2, No 13, 297-305

Abstract: Abstract 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.

Keywords: Channel estimation; Least square; OFDMA; Power allocation (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1007/s11235-015-0121-7

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