Knowledge of the channel state information (CSI) at the transmitter side is one of the primary sources of information that can be used for efficient allocation of wireless resources. Obtaining Down-Link (DL) CSI in Frequency Division Duplexing (FDD) systems from Up-Link (UL) CSI is not as straightforward as in TDD systems, and so usually users feedback the DL-CSI to the transmitter. To remove the need for feedback (and thus having less signaling overhead), several methods have been studied to estimate DL-CSI from UL-CSI. In this paper, we propose a scheme to infer DL-CSI by observing UL-CSI in which we use two recent deep neural network structures: a) Convolutional Neural networks and b) Generative Adversarial Networks. The proposed deep network structures first learn a latent model of the environment from the training data. Then, the result latent model is used to predict the DL-CSI from the UL-CSI. We have simulated the proposed scheme and evaluated its performance in a few network settings. Simulation results (for different multipath environments) demonstrate efficiency of both direct and generative approaches for UL2DL prediction. One key feature of new generation of cellular networks is their efficient use of frequency bands and energy. To achieve this goal, they use various techniques such as water-filling, appropriate precoding and beamforming. In Time Division Duplexing (TDD) systems, Up-Link (UL) and Down-Link (DL) frequencies are equal, so we can use channel reciprocity and simply infer the DL channel by observing the UL channel.