3 research outputs found
Degrees of freedom of the rank-deficient MIMO X channel
The multiple-input multiple-output (MIMO) X
channel with rank-deficient channels is considered. We characterize the total degrees of freedom (DoF) by defining an outer
bound which is attained by the proposed precoding scheme. The total DoF are described in closed-form when all transmitters and
receivers have M and N antennas, respectively. For an arbitrary number of antennas, the total DoF are obtained as solution of a linear programming problem. Results elucidate that, unlike point-to-point MIMO systems where DoF increase with the rank
of the channel, the total DoF in a ultipoint-to-multipoint MIMO system can increase up to a certain point if channels are ankdeficient.
Hence, we corroborate the relevance of knowing the rank-deficiency in the MIMO X channel, a property already observed in the MIMO Interference channel.Peer ReviewedPostprint (published version
Degrees of freedom of the rank-deficient MIMO X channel
The multiple-input multiple-output (MIMO) X
channel with rank-deficient channels is considered. We characterize the total degrees of freedom (DoF) by defining an outer
bound which is attained by the proposed precoding scheme. The total DoF are described in closed-form when all transmitters and
receivers have M and N antennas, respectively. For an arbitrary number of antennas, the total DoF are obtained as solution of a linear programming problem. Results elucidate that, unlike point-to-point MIMO systems where DoF increase with the rank
of the channel, the total DoF in a ultipoint-to-multipoint MIMO system can increase up to a certain point if channels are ankdeficient.
Hence, we corroborate the relevance of knowing the rank-deficiency in the MIMO X channel, a property already observed in the MIMO Interference channel.Peer Reviewe
Degrees of freedom of the rank-deficient MIMO X channel
The multiple-input multiple-output (MIMO) X
channel with rank-deficient channels is considered. We characterize the total degrees of freedom (DoF) by defining an outer
bound which is attained by the proposed precoding scheme. The total DoF are described in closed-form when all transmitters and
receivers have M and N antennas, respectively. For an arbitrary number of antennas, the total DoF are obtained as solution of a linear programming problem. Results elucidate that, unlike point-to-point MIMO systems where DoF increase with the rank
of the channel, the total DoF in a ultipoint-to-multipoint MIMO system can increase up to a certain point if channels are ankdeficient.
Hence, we corroborate the relevance of knowing the rank-deficiency in the MIMO X channel, a property already observed in the MIMO Interference channel.Peer Reviewe