Abstract
The combination of non-orthogonal multiple access (NOMA) and multiple-input multiple-output (MIMO) signaling is capable of providing significantly improved spectral efficiency and effective multiple access. However, conventional MIMO-NOMA entails significantly increased power consumption and implementation complexity. Inspired by the essence of spatial modulation (SM), in this paper, a novel three-node cooperative relaying system (CRS) using SM-aided NOMA, termed CRS-SM-NOMA, is proposed, in which the messages for two users are conveyed by two different information-bearing units of SM. As the reference scheme, conventional CRS-NOMA is further re-investigated with multiple receive antennas. Besides the achievable rate, which is adopted by most of the existing NOMA works as the performance metric, the bit error rate (BER) of CRS-SM-NOMA and CRS-NOMA is analyzed assuming maximum-likelihood detection. Approximate bit error probability expressions are derived in closed form for both users. Simulation results verify the analysis and show that the proposed CRS-SM-NOMA outperforms conventional CRS-NOMA and SM-OMA in terms of the BER as well as ergodic sum rate.
Original language | English (US) |
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Article number | 8636968 |
Pages (from-to) | 715-728 |
Number of pages | 14 |
Journal | IEEE Journal on Selected Topics in Signal Processing |
Volume | 13 |
Issue number | 3 |
DOIs | |
State | Published - Jun 2019 |
All Science Journal Classification (ASJC) codes
- Signal Processing
- Electrical and Electronic Engineering
Keywords
- Bit error rate
- cooperative relaying
- non-orthogonal multiple access
- spatial modulation
- sum rate