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polynomial rooting based frequency offset estimation for MIMO OFDM systems

Journal of Southeast University(English Edition) 2008年第4期24卷 397-401页

作者：蒋雁翔尤肖虎高西奇东南大学移动通信国家重点实验室南京210096

Based on the frequency domain training sequences, the polynomial-based carrier frequency offset （CFO） estimation in multiple-input multiple-output （ MIMO ） orthogonal frequency division multiplexing （ OFDM ） systems is extensively investigated. By designing the training sequences to meet certain conditions and exploiting the Hermitian and real symmetric properties of the corresponding matrices, it is found that the roots of the polynomials corresponding to the cost functions are pairwise and that both meger CFO and fractional CFO can be estimated by the direct polynomial rooting approach. By analyzing the polynomials corresponding to the cost functions and their derivatives, it is shown that they have a common polynomial factor and the former can be expressed in a quadratic form of the common polynomial factor. Analytical results further reveal that the derivative polynomial rooting approach is equivalent to the direct one in estimation at the same signal-to-noise ratio（SNR） value and that the latter is superior to the former in complexity. Simulation results agree well with analytical results.

关键词： MIMO OFDM frequency selective fading channels frequency offset estimation polynomial rooting

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A search-free near-field source localization method with exact signal model

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Journal of Systems Engineering and Electronics 2021年第4期32卷 756-763页

作者： PAN Jingjing SINGH Parth Raj MEN Shaoyang Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space Nanjing University of Aeronautics and AstronauticsNanjing 211106China Department of Electronic Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China International Electronics Engineering S.A. Bissen L-7795Luxembourg School of Medical Information Engineering Guangzhou University of Chinese MedicineGuangzhou 510006China

Most of the near-field source localization methods are developed with the approximated signal model,because the phases of the received near-field signal are highly ***,the approximated signal model based methods suffer from model mismatch and performance degradation while the exact signal model based estimation methods usually involve parameter searching or multiple decomposition *** this paper,a search-free near-field source localization method is proposed with the exact signal ***,the approximative estimates of the direction of arrival(DOA)and range are obtained by using the approximated signal model based method through parameter separation and polynomial rooting ***,the approximative estimates are corrected with the exact signal model according to the exact expressions of phase difference in near-field *** proposed method avoids spectral searching and parameter pairing and has enhanced estimation *** simulations are provided to demonstrate the effectiveness of the proposed method.

关键词： near-field source localization polynomial rooting approximation error exact signal model

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