Degrees of Freedom of the MIMO Z-Interference Channel With Delayed CSIT

作者：Mohanty Kaniska^*; Varanasi Mahesh K

来源：IEEE Communications Letters, 2015, 19(12): 2282-2285.

DOI：10.1109/LCOMM.2015.2483584

• Channel state information
• degrees of freedom
• interference channel
• MIMO

The degrees of freedom region is established for the 2-user multiple-inputmultiple-output Z-interference channel with an arbitrary number of antennas at each node, under the assumption of delayed channel state information at the transmitters. A new interference alignment scheme is obtained and is shown to be optimal in the degrees of freedom (DoF) metric. When used over an interference channel with one cross-link being statistically weaker than the other three links, this scheme, by explicitly recognizing the relative weakness of that link, can lead to a DoF improvement over the DoF-optimal scheme designed for the fully connected interference channel, while also requiring no feedback of the weak link's channel state information.

• 出版日期2015-12