Abstract
Considering a two-user multi-antenna Broadcast Channel, this letter shows that linearly precoded Rate-Splitting (RS) with Successive Interference Cancellation (SIC) receivers is a flexible framework for non-orthogonal transmission that generalizes, and subsumes as special cases, four seemingly different strategies, namely Space Division Multiple Access (SDMA) based on linear precoding, Orthogonal Multiple Access (OMA), Non-Orthogonal Multiple Access (NOMA) based on linearly precoded superposition coding with SIC, and physical-layer multicasting. This letter studies the sum-rate and shows analytically how RS unifies, outperforms, and specializes to SDMA, OMA, NOMA, and multicasting as a function of the disparity of the channel strengths and the angle between the user channel directions.
Original language | English (US) |
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Article number | 8907421 |
Pages (from-to) | 349-353 |
Number of pages | 5 |
Journal | IEEE Wireless Communications Letters |
Volume | 9 |
Issue number | 3 |
DOIs | |
State | Published - Mar 2020 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Control and Systems Engineering
- Electrical and Electronic Engineering
Keywords
- NOMA
- OMA
- Rate-splitting
- SDMA
- multi-antenna broadcast channel
- multicasting
- rate analysis