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面向建筑空间的OFDM信号定位性能分析
邓中亮
0
(北京邮电大学,北京 100876)
摘要:
针对利用OFDM信号进行定位时信号非连续性问题,提出一种粗检测和精细检测结合的测距方法,将距离测量转换为不同尺度的时延样点,采用时域粗检测快速估算接收OFDM信号的最大相关峰值,然后对传输时延进行频域精细测量,提升了小数倍采样周期时延测量的精度。在此基础上,分析了OFDM信号的定位性能,仿真结果表明,当OFDM信号在信噪比-11dB的情况下测距误差由3m左右(子载波数512)降至1m(子载波数4096)。
关键词:  建筑空间  室内定位  通信与导航融合  OFDM
DOI:
基金项目:国家重点研发计划(2016YFB0502503)
Performance Analysis of OFDM Signal Positioning for Indoor Building
DENG Zhong-liang
(Beijing University of Posts and Telecommunications, Beijing 100876, China)
Abstract:
For the problem of signal discontinuity when positioning using OFDM signals, a coarse detection and fine detection combined ranging method is proposed, which converts the distance measurement into delay samples of different scales, and uses time domain coarse detection to quickly estimate the received the maximum correlation peak value of OFDM signal. Then the frequency domain fine-grained measurement of the transmission delay is carried out to improve the accuracy of the fractional sampling period delay measurement. The positioning performance of the OFDM signal is analyzed on this base. Simulation results show that when the SNR of the OFDM signal is -11dB, the ranging error is reduced from about 3m (the number of subcarriers 512) to 1m (the number of subcarriers is 4096).
Key words:  Building Space  Indoor positioning  Fused communication and navigation  OFDM

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