OFDM测距误差分析——第一部分?

OFDM作为一种有效和便捷的数字调制传输方式已经可以被广泛应用在宽带数字传输系统中.由于OFDM接收系统需要具备很高的频率和定时精度,因此可以构建基于测量OFDM信号传播时间的测距定位系统.重点建立了用于精确OFDM广播测距的信号模型,并分析影响测距精度的各种因素和推导给出了测距误差下界.第一部分在给出OFDM帧同步测距原理和基本OFDM系统描述基础上,建立了系统测距时间模型,包括信号发射和接收时序、时间参考系和信号传播伪距观测方程,最后建立了用于测距的OFDM信号发射模型和信道传输模型.用于测距的OFDM信号接收模型以及测距误差分析在第二部分研究.

Analysis of Measurement Errors of Ranging Based on OFDM Synchronization——Part Ⅰ

Orthogonal frequency-division multiplexing(OFDM) is a bandwidth-efficient modulation technology for wideband digital communications. Because of better synchronization performance than conventional single-carrier modulation schemes,a novel positioning technology can be established on highly precise timing measurements of OFDM ranging.We focus on the signal models of OFDM ranging and analysis the lower bound of ranging measurement errors.In Part I of this paper firstly the ranging principle based on OFDM frame synchronization and the basic system model are studied;and then the system time models including signal transmission and reception,the reference time and the pseudo-range observation equation are researched;finally the transmission model and channel model for OFDM ranging signals are set up.The reception model for OFDM ranging signals and the observation performance evaluating are detailedly presented in Part II.