基于干扰抑制的恒模波束跟踪新算法

当干扰信号强度不小于期望信号时,常规恒模算法(CMA)会错误跟踪到干扰信号;期望信号导向矢量线性约束恒模算法(LSCCMA)通过对期望信号来波方向约束,可正确跟踪到期望信号,但是算法在干扰信号来波方向上不能形成明显的零陷。为此,提出了基于干扰约束的恒模算法(LIC-CMBTA)。理论分析和仿真结果证明,该算法不仅可以正确跟踪到期望信号,并且可实现在多个强干扰信号来波方向上形成深度可调的干扰零陷,从而提高了常规恒模算法波束跟踪的稳健性。

A new constant modulus beam tracking algorithm based on interference signals constrained

The traditional constant modulus algorithm (CMA) fails to track the desired signal, when it companies with stronger interference signals. Though the linear signals constrained constant modulus algorithm (LSCCMA) can solve the problem when knowing the accurate direction of arrival (DOA)of the desired signal, it cannot form an obvious interference null at the DOA of interference signals. Therefore, a linear interference constant modulus beam tracking algorithm (LICCMBTA) is presented in this paper based on above mentioned problems. Theoretical analysis and simulation results indicate that the LICCMBTA can not only track the desired signal correctly, but also forms deep null at the DOA of interference signals simultaneously according to the adjustable null factors. The LICCMBTA improves the robustness of the traditional CMA.