Classifying Transistor Amplifier
It's a common base amplifier. This might help you: http://www.ee.sc.edu/personal/faculty/simin/ELCT563/21%20BJT%20circuits,%20gain%20and%20design.pdf

or this if you want more general help: http://www.radio-electronics.com/info/circuits/transistor/common-base-amplifier-configuration.php