一种基于滑动最小二乘法的精确同步方法

A precise synchronization method based on slipping least square algorithm

最小二乘拟合鉴相曲线的方法可以实现精确同步,但其只能工作在很小的误差范围内,适用范围窄。提出一种基于正斜率和误差平方和最小准则的滑动最小二乘精确同步方法,该方法在粗同步前后各一个码片范围内进行滑动搜索选出最优测量结果。分析和仿真结果表明,该方法具有很强的抗噪声能力,并且在粗同步误差较大时依然具有很高的测量精度。

Precise synchronization can be achieved by fitting phase discrimination curve with the least squares. However, this method can only work when the error is small, so that it can only be used in narrow range. A precise synchronization method based on the rule of positive slope and least error square is proposed, which searches for the optimal result in each chip of the prior and the posterior coarse synchronization. Theoretical analysis and simulation shows that this method can outstandingly eliminate influence of noise, besides, the proposed method still has very high measurement precision as the coarse synchronization error is large.