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Golay Pair Aided Timing Synchronization Algorithm for Distributed MIMO-OFDM System

China Communications 2018年第9期15卷 178-188页

作者： Weizhi Zhong Xiaoyi Lu Lei Xu Xin Liu College of Astronautics Nanjing University of Aeronautics and Astronautics China Dalian University of Technology School of information and communications

In order to solve the problem of inaccurate synchronization for distributed multiple-input multiple-output(MIMO) orthogonal frequency division multiplexing(OFDM) system in both multipath and low signal to noise ratio(snr) channels, a golay pair aided timing synchronization(GPATS) method is proposed in this paper. A new synchronous training sequence based on the golay pair with guard interval is designed in GPATS method. By utilizing the unique properties of the new training sequence, the different timing point and the inter-transmitter delays(ITD) are obtained at the receiver. Simulation results show that, compared with the traditional synchronization approaches, the proposed algorithm can provide high accuracy in detecting different time offsets caused by the distributed transmitters of the MIMO-OFDM system, especially over multipath and low snr channels.

关键词： distributed MIMO-OFDM system timing synchronization golay pair multipath low snr

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维普期刊数据库

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Novel high-resolution DOA estimation using subspace projection method

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The Journal of China Universities of Posts and Telecommunications 2012年第4期19卷 110-116页

作者： SI Wei-jian LAN Xiao-yu ZOU Yan College of Information and Communication Engineering Harbin Engineering University Harbin 150001 China No. 91404 Army Qinhuangdao 066000 China

The performance of multiple signal classification （MUSIC） algorithm with regard to solving closely spaced direction of arrivals （DOAs） depends strongly upon the signal-to-noise ratio （snr） and snapshots. In order to solve this problem, a method by reconstructing the spatial spectrum function with both noise subspace and signal subspace is presented in this paper. The key idea is to apply the full information contained in covariance matrix and change the projection weights of steering vector on the noise and signal subspace by their revised eigenvalues, respectively. Comparing with the MUSIC algorithm, it does not increase any computational complexity either, and remarkably, it has the advantages of simultaneously reducing noise and keeping the high-resolution ability under low snr and small sample sized scenarios. Simulation and experiment results are included to demonstrate the superior performance of the proposed algorithm.

关键词： direction &arrival (DOA) multiple signal classification low snr resolution subspace projection

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维普期刊数据库

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Feature Extraction of Localized Scattering Centers Using the Modified TLS-Prony Algorithm and Its Applications

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Journal of Systems Engineering and Electronics 2002年第3期13卷 31-39页

作者： Wang Jun Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900, P.R.China Institute of Electronic Engineering China Academy of Engineering Physics Mianyang 621900 P. R. China

This paper presents an all-parametric model of radar target in optic region, in which the localized scattering center's frequency and aspect angle dependent scattering level, distance and azimuth locations are modeled as the feature vectors. And the traditional TLS-Prony algorithm is modified to extract these feature vectors. The analysis of Cramer-Rao bound shows that the modified algorithm not only improves the restriction of high signal-to-noise ratio(snr)threshold of traditional TLS-Prony algorithm, but also is suitable to the extraction of big damped coefficients and high-resolution estimation of near separation poles. Finally, an illustrative example is presented to verify its practicability in the applications. The experimental results show that the method developed can not only recognize two airplane-like targets with similar shape at low snr, but also compress the original radar data with high fidelity.

关键词： Localized scattering centers Estimation algorithm low snr High resolution.

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维普期刊数据库

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Frame synchronization method for BDS B2a signal under the constraint of Non-binary LDPC code

Frame synchronization method for BDS B2a signal under the co...

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第十一届中国卫星导航年会

作者： Bowen Jiang Lin Chen Hongchen Pan Yuqi Liu Jiangyu Chen Shaobin Guo The 29th Research Institute of China Electronics Technology Group Corporation

low-Density Parity-Check(LDPC) Code has become one of the best coding technologies at present because of its low complexity iterative decoding algorithm and its performance with further close to the S

关键词： Non-binary LDPC codes Frame Synchronization navigation message low snr Extended min-sum algorithm

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