Abstract:
Non-Orthogonal Multiple Access (NOMA) is a promising radio access technology, which
improves the spectrum efficiency and system throughput considerably over conventional Orthogonal
Multiple Access (OMA) techniques and also enables massive connectivity. NOMA is
currently being considered extensively as a key enabling technology for 5G wireless networks.
However, in NOMA, one of the key technical challenges is to develop efficient receivers due
to the presence of Multiple-Access Interference (MAI) caused by non-orthogonal resource allocation.
Minimum Mean Square Error (MMSE) based Successive Interference Cancellation
(SIC) receivers have widely been discussed in the literature for power-domain NOMA systems.
However MMSE detector is a linear detector with poor error performance. In this research, a
K-Best sphere detector based SIC receiver is discussed for the downlink of power-domain
MIMO-NOMA systems. The BER performance of the proposed receiver is investigated for
different power allocation ratios and for different K values of the K-Best detector. Link level
simulation results demonstrate that our proposed K-Best detector based receiver offers much
superior performance over the MMSE-SIC based receiver.
Citation:
Bandara, A.M. (2019). K-best sphere detector based receiver for mimo non-orthogonal multiple access systems [Master’s theses, University of Moratuwa]. Institutional Repository University of Moratuwa. http://dl.lib.uom.lk/handle/123/16789