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Current research on signal estimation based on antenna array mostly focuses on certain signal of interest (SOI), in the presence of jammers, clutters and thermal noise. In reality, jammers play a critical role on the accuracy of the SOI estimation. In order to fundamentally figure out how jammers affect any estimation result, we concentrate our analysis on Cramer-Rao lower bound (CRLB) of the strength of the SOI. There are mainly three characters of jammers: the strengths, the directions of arrival and the quantity. This paper aims to figure out whether and how the above three characters of jammers take effect. It is also interesting to see how the number of receiving elements affects our concern.