一种高精度的TOA估计方法

沈建锋; 王宗欣

一种高精度的TOA估计方法

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出版历程
- 收稿日期: 2002-05-27
- 修回日期: 2002-10-23
- 刊出日期: 2003-11-19

A toa estimation method with high resolution

摘要

摘要: 提出了一种 CDMA系统的高精度的信号到达时延(TOA)的估计方法。在不提高采样频率的情况下,使用积分-清除电路对接收信号进行采样,将离散信号用离散傅里叶变换(DFT)转换到频率域中,然后根据 CDMA信号模型和多径信道模型以及已知的扩频码的离散频谱,估计出信号相对于一个码片周期的整数部分 TOA;再在离散频率域中用最小二乘法估计出信号到达的小数部分 TOA,该方法即使在采样频率不高的情况下,也有很高的精度,而且运算量小,因此是一种有效的高精度 TOA估计方法。
- 到达时延（TOA）; 离散傅里叶变换（DFT）; 最小二乘（LS）法; 波达方向（DOA）
Abstract: A Time-Of-Arrival(TOA) estimation method for CDMA system with high reso-lution is proposed. The integrate-dump circuits are used to sample the received signals while the sampling rate is not raised, then the Discrete-Fourier-Transform(DFT) is used to transform the discrete signals to frequency domain. Based upon the CDMA signal model, the multipath channel model and the discrete frequency spectrum of the known spreading codes, the integer part of TOA with multiples of a chip interval is estimated. Then least square method in discrete frequency domain is used to estimate the remainder fractional part of TOA. This method has the high resolution with low operation volume while the sampling rate is not high, so it is an effective and high precise TOA estimation method.

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