Patent ID: 9363815
Filing Date: 2016-06-07
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A method for a space division multiple access (SDMA) transmission in a multi-user multi-input multi-output (MU MIMO) system, comprising: calculating, by a base station and for each of a plurality of users, a projection matrix of a channel information matrix of a respective user, wherein the projection matrix is projected onto a joint channel matrix, the joint channel matrix is a joint channel information matrix of users, other than the respective user, in a user group of which the respective user is a member, and wherein the user group being one of a plurality of user groups comprising all possible combinations of the plurality of users; calculating, by the base station and for each of the plurality of user groups, a capacity metric according to a corresponding projection matrix; determining, by the base station, according to capacity metrics of the plurality of user groups, a user group; and a SDMA transmission is provided by the base station to the determined user group; wherein in the calculating the capacity metric for each of the plurality of user groups comprises: calculating a capacity metric of each sub-carrier of each user in a respective user group according to the corresponding projection matrix of the user; weighting the capacity metric of each sub-carrier of each user in the respective user group; and calculating, for each user in the respective user group, a corresponding capacity metric by generating a sum of the weighted capacity metrics of each user and, for the respective user group, the capacity metric by summing the generated sums of the weighted capacity metrics of all users in the respective user group.