1 research outputs found
Gaussian Message Passing Iterative Detection for MIMO-NOMA Systems with Massive Access
This paper considers a low-complexity Gaussian Message Passing Iterative
Detection (GMPID) algorithm for Multiple-Input Multiple-Output systems with
Non-Orthogonal Multiple Access (MIMO-NOMA), in which a base station with
antennas serves sources simultaneously. Both and are very
large numbers and we consider the cases that . The GMPID is based on a
fully connected loopy graph, which is well understood to be not convergent in
some cases. The large-scale property of the MIMO-NOMA is used to simplify the
convergence analysis. Firstly, we prove that the variances of the GMPID
definitely converge to that of Minimum Mean Square Error (MMSE) detection.
Secondly, two sufficient conditions that the means of the GMPID converge to a
higher MSE than that of the MMSE detection are proposed. However, the means of
the GMPID may still not converge when . Therefore,
a new convergent SA-GMPID is proposed, which converges to the MMSE detection
for any with a faster convergence speed. Finally, numerical results
are provided to verify the validity of the proposed theoretical results.Comment: 6 pages, 5 figures, IEEE GLOBECOM 2016, Accepted. arXiv admin note:
text overlap with arXiv:1606.0640