最小二乘(LS)是许多实时自适应信号处理问题的核心。本文针对无平方根的定标Givens旋转方法,分析了用脉动(Systolic)阵实现时各处理单元和内部传递参数的动态范围,并确定了保证算法正确实现所需的字长下界。计算机仿真结果表明,这样选取字长是合适的,所得的算法也是稳定的。 Least squares (LS) is the heart of many real-time adaptive signal processing problems. In this paper, for the non-square rooted Givens rotation method, the dynamic range of each processing unit and internal transfer parameters when using the Systolic array is analyzed, and the lower bound of word length for ensuring the correct implementation of the algorithm is determined. Computer simulation results show that this choice of word length is appropriate and the resulting algorithm is stable.