Institute of Electrical & Electronic Engineers
Interference alignment has been shown to be a useful technique to achieve the optimal Degrees of Freedom (DoF) for various wireless network models. To effectively implement interference alignment, it is crucial to have global instant Channel State Information (CSI) at the Transmitters (CSIT), denoted as full CSI/CSIT here onward, and is usually hard to obtain for practical systems. When there is no CSIT in the system, loss of DoF is observed for many scenarios of interest in references. Recognizing the difficulty of obtaining full CSIT, references have studied the cases when only the channel correlation structure is known at the transmitters and have proposed interference alignment schemes using the channel correlation to achieve the optimal DoF.