SUM CAPACITY ANALYSIS OF NOMA WITH BEAM SPACE BEAM FORMING

Abstract

In this paper, proposed a non-orthogonal multiple access (NOMA) network
based on Beam Space Beam Forming that has been aimed at finding capacity performance in the
MU wireless network for down link transmission. The comparative performance analysis of the
proposed network model based on the multiple access schemes that include NOMA and OMA.
As the key feature of NOMA is to serve the multiple users at the same time/frequency/code, but
with different power levels, that provides a notable gain in sum capacity over preceding OMA.
Keeping this feature in mind the power allocation strategy is implemented, to assign power to
multiple users simultaneously. To exhibit improvement in the sum capacity, an algorithm is
proposed, which is a distance detector with a memory which identifies the users in the current
position and then differentiates them as a near and far user. Secondly, this detector then assigns
powers to the user’s as per the NOMA fundamentals. This algorithm selects two users; the
selected users will have a large channel difference between them. That reduces the interference
from adjacent user. To expand the sum capacity in multiuser multiple input multiple output
NOMA network, beam space beam forming is in cooperated. The users in same beams with
NOMA fundamentals will have high correlation between them that will reduce the inter-beam
interference. The user pairing and power allocation methodology ensures that each user assigned
power as per NOMA principle to maximize the sum capacity of users and will reduce the amount
interference from adjacent beams and users. The capacity comparison exhibits that the multi-user
multiple input multiple output NOMA with Beam Space Beam forming performs better than the
conventional Beam Forming.