Design of Downlink Hybrid NOMA Transmission
CoRR(2024)
摘要
The aim of this paper is to develop hybrid non-orthogonal multiple access
(NOMA) assisted downlink transmission. First, for the single-input
single-output (SISO) scenario, i.e., each node is equipped with a single
antenna, a novel hybrid NOMA scheme is introduced, where NOMA is implemented as
an add-on of a legacy time division multiple access (TDMA) network. Because of
the simplicity of the SISO scenario, analytical results can be developed to
reveal important properties of downlink hybrid NOMA. For example, in the case
that the users' channel gains are ordered and the durations of their time slots
are the same, downlink hybrid NOMA is shown to always outperform TDMA, which is
different from the existing conclusion for uplink hybrid NOMA. Second, the
proposed downlink SISO hybrid NOMA scheme is extended to the multiple-input
single-output (MISO) scenario, i.e., the base station has multiple antennas.
For the MISO scenario, near-field communication is considered to illustrate how
NOMA can be used as an add-on in legacy networks based on space division
multiple access and TDMA. Simulation results verify the developed analytical
results and demonstrate the superior performance of downlink hybrid NOMA
compared to conventional orthogonal multiple access.
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