Symmetric Degrees of Freedom of the MIMO 3-Way Channel with M_T x M_R Antennas


H. Maier, A. Chaaban, R. Mathar,


        We investigate the symmetric Degrees of-Freedom (DoF) of a homogeneous multiple-input multiple-output (MIMO) 3-way channel with MT transmit antennas and MR receive antennas at each user. The 3-way channel extends the two-way channel to three users, who exchange six messages in total, i. e., there is one message from each user to each of the two other users. We assume that each user operates in a perfect full-duplex mode. Genie-aided upper bounds on the DoF of the channel are derived and it is shown that those are achievable by combining MIMO interference alignment, null-space beam-forming and zero-forcing. A particular gain from this homogeneous setup is that the symmetric DoF allocation providing complete fairness among all users is sum-DoF optimal.

BibTEX Reference Entry 

	author = {Henning Maier and Anas Chaaban and Rudolf Mathar},
	title = "Symmetric Degrees of Freedom of the {MIMO} 3-Way Channel with M{\_}T x M{\_}R Antennas",
	pages = "93-97",
	booktitle = "{IEEE} Information Theory Workshop (ITW 2014)",
	address = {Hobart, TAS, Australia},
	month = Nov,
	year = 2014,
	hsb = hsb999910369199 ,


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