This paper analyzes the convergence rate of sample matrix inversion
(SMI) filter used by array receivers in pulse interference environment.
Firstly, the convergence characteristics of SMI filter under pulse
interference are deduced, and the relationship between the convergence
speed and length of training samples and duty of interference is given.
Then, the results of signal simulation are consistent with those of
numerical analysis, which verifies the correctness of theoretical
analysis. The results show that the convergence speed of SMI filter
decreases under pulse interference, and the SMI filter needs more
training samples to suppress the pulse interference effectively.