Achievable Degrees of Freedom for K-User MIMO Y Channels Using Signal Group Based Alignment

作者：Mu Hua^*; Tugnait Jitendra K

来源：IEEE Transactions on Wireless Communications, 2014, 13(8): 4520-4533.

DOI：10.1109/TWC.2014.2318050

• Multiuser Y channel
• degrees of freedom
• multiple input multiple output (MIMO)
• interference alignment
• network coding

We consider a K-user multiple input multiple output (MIMO) Y channel consisting of K(%26gt;= 3) users and a relay. Each user has K - 1 independent messages for all the other K - 1 users. Degrees of freedom (DoF) of such channels is not known in general but it is known that the DoF of K(K - 1)/2 is achievable for a network operating in a half-duplex mode by using signal space alignment for network coding during both the multiple access phase and the broadcast phase. In this paper, a novel signal group based alignment scheme is proposed, which divides all K(K - 1) signals into l groups where l = K or K - 1. Then, the signals in each group are aligned into a smaller subspace at the relay. If the i-th user is equipped with M-i antennas and the relay is equipped with N antennas where all antennas are used for both transmitting and receiving, we prove that when Mi = K - 1, N = (K - 1)(2) for even K and M-i = K - 1, N = K(K - 2) for odd K, the optimal total DoF of this K-user MIMO Y channel is K(K - 1)/2. As a consequence, to achieve the total DoF of K(K - 1)/2, the requirements on M-i and N are M-i %26gt;= K - 1 and N %26gt;= (K - 1)(2) for even K, and Mi %26gt;= K - 1 and N %26gt;= K(K - 2) for odd K. In our proposed approach, we significantly decrease the minimum M-i at the expense of higher N for a given number of users K and achievable DoF of K(K - 1)/2, compared to an existing approach. This signal group alignment concept also motivates other signal grouping methods, which provide a tradeoff between number of antennas at end users and the relay. Also, for the K-user Y channel where all end users have a single antenna and the relay node has N antennas, it is shown that the DoF of min{K/2, (N + 1)/2} is achievable.

• 出版日期2014-8