一种改进的定时同步算法
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1.上海大学通信与信息工程学院 上海 200072;2.中国科学院上海高等研究院 公共安全中心 上海 201210

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TP393

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Improved timing synchronization algorithm
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1.SchoolofCommunicationandInformationEngineering,ShanghaiUniversity,Shanghai200072,China;2.PublicSecurityCenter,ShanghaiAdvancedResearchInstitute,ChineseAcademyofSciences,Shanghai201210,China

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    摘要:

    离散傅立叶变化扩展的正交频分复用(DFTSOFDM)技术已被3GPP采用,作为长期演进项目(LTE)的上行调制方案,具有峰均比(PAPR)低等优势。该方案中接收机端现有的定时同步算法,大都不能适应低信噪比的高斯白噪声信道和多径衰落信道的恶劣环境。针对此情况,本文提出了一种改进的假设检验统计量,用来进行定时同步。理论分析与仿真表明,在AWGN信道和多径衰落信道下,低信噪比(10dB)的工作条件,改进的算法对高速运动引起的多普勒频偏具有较强的抵抗力。接收机能快速、高准确率的同步上发送数据的帧头,改进算法对工程应用具有一定价值。

    Abstract:

    As the uplink modulation scheme in Long Term Evolution (LTE), Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (DFTSOFDM) technology has been adopted by 3GPP, which has some advantages such as lower Peak to Average Power Ratio (PAPR), ealc. Most of the current timing synchronization algorithms used in the receivers can’t meet additive white Gaussian noise (AWGN) and multipath fading channels in the low signal to noise ratio (SNR). For this situation, an improved hypothesis test statistic is proposed in this scheme, which is used for timing synchronization. The theoretical analysis and simulation results demonstrate that the performance of this new statistic is beyond the initial method in AWGN and multipath fading channels, especially in the case of low SNR, and it is robust against the Doppler frequency offset caused by high speed motion. The receivers can rapidly catch the head of transmit frames in high accuracy rate, so this improved timing synchronization algorithm has some value for engineering application.

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朱峰芹,翟旭平,田朝阳,张小东.一种改进的定时同步算法[J].电子测量技术,2016,39(2):42-45

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  • 在线发布日期: 2016-04-20
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