ABSTRACT
In this paper, a multi-user multiple input multiple output network is considered with a user clustering technique so that groups of users can be served on a common resource. A hierarchical clustering algorithm defined on the distance metric has been used to form the user clusters. Users within a cluster exploit the non-orthogonal multiple access method to serve the users on the same time and frequency resource blocks, thus resulting in a spectrally efficient transmission. While the different clusters of users are served on several focussed beams, the popular zero-forcing beamforming method is adopted to cancel the inter-cluster interference. Performance evaluation in terms of the sum rate of users and fairness has been done to establish the efficiency of the proposed network model.
Disclosure statement
No potential conflict of interest was reported by the author(s).