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Time reversed space-time block code (TR-STBC) was originally proposed to handle frequency selective fading channels. Its detection requires accurate channel knowledge at the receiver side. In this work, we present a channel estimation approach that does not require training data under TR-STBC encoding. We provide identification conditions that are based on the known code parameters as well as channel matrix rank. We present a simple subspace algorithm for channel estimation. Additionally, simulations results are presented to highlight the performance of the estimation scheme.