Code-Domain NOMA in Massive MIMO: When Is It Needed?
نویسندگان
چکیده
In overloaded Massive MIMO (mMIMO) systems, wherein the number K of user equipments (UEs) exceeds base station antennas M, it has recently been shown that non-orthogonal multiple access (NOMA) can increase sum spectral efficiency. This paper aims at identifying cases where code-domain NOMA improve efficiency mMIMO in classical regime <; M. Novel expressions are provided for uplink and downlink with arbitrary spreading signatures spatial correlation matrices. Particular attention is devoted to planar arrays currently being deployed pre-5G 5G networks (in sub-$6$ GHz bands), which characterized by limited resolution. Numerical results show such benefit from scenarios UEs spatially close each other. A two-step UE grouping scheme proposed NOMA-aided systems applicable matrices active cell. used investigate performance algorithm under different operating conditions types (orthogonal, sparse random sets). The analysis reveals orthogonal provide highest average
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ژورنال
عنوان ژورنال: IEEE Transactions on Vehicular Technology
سال: 2021
ISSN: ['0018-9545', '1939-9359']
DOI: https://doi.org/10.1109/tvt.2021.3072409