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In this paper, we address the finite Signal-to-Noise Ratio (SNR)Diversity-Multiplexing Tradeoff (DMT) of the Multiple Input Multiple Output(MIMO) wiretap channel, where a Zero-Forcing (ZF) transmit scheme, that intendsto send the secret information in the orthogonal space of the eavesdropperchannel, is used. First, we introduce the secrecy multiplexing gain atfinite-SNR that generalizes the definition at high-SNR. Then, we provide upperand lower bounds on the outage probability under secrecy constraint, from whichsecrecy diversity gain estimates of ZF are derived. Through asymptoticanalysis, we show that the upper bound underestimates the secrecy diversitygain, whereas the lower bound is tight at high-SNR, and thus its relateddiversity gain estimate is equal to the actual asymptotic secrecy diversitygain of the MIMO wiretap channel.

Secure Diversity-Multiplexing Tradeoff of Zero-Forcing Transmit Scheme at Finite-SNR