TY - GEN
T1 - Energy Efficiency of Rate-Splitting Multiple Access, and Performance Benefits over SDMA and NOMA
AU - Mao, Yijie
AU - Clerckx, Bruno
AU - Li, Victor O.K.
N1 - Funding Information:
This work is partially supported by the U.K. Engineering and Physical Sciences Research Council (EPSRC) under grant EP/N015312/1.
Publisher Copyright:
© 2018 IEEE.
PY - 2018/10/12
Y1 - 2018/10/12
N2 - Rate-Splitting Multiple Access (RSMA) is a general and powerful multiple access framework for downlink multi- Antenna systems, and contains Space-Division Multiple Access (SDMA) and Non-Orthogonal Multiple Access (NOMA) as spe- cial cases. RSMA relies on linearly precoded rate-splitting with Successive Interference Cancellation (SIC) to decode part of the interference and treat the remaining part of the interference as noise. Recently, RSMA has been shown to outperform both SDMA and NOMA rate-wise in a wide range of network loads (underloaded and overloaded regimes) and user deployments (with a diversity of channel directions, channel strengths and qualities of channel state information at the transmitter). Moreover, RSMA was shown to provide spectral efficiency and QoS enhancements over NOMA at a lower computational complexity for the transmit scheduler and the receivers. In this paper, we build upon those results and investigate the energy efficiency of RSMA compared to SDMA and NOMA. Considering a multiple-input single-output broadcast channel, we show that RSMA is more energy-efficient than SDMA and NOMA in a wide range of user deployments (with a diversity of channel directions and channel strengths). We conclude that RSMA is more spectrally and energy-efficient than SDMA and NOMA.
AB - Rate-Splitting Multiple Access (RSMA) is a general and powerful multiple access framework for downlink multi- Antenna systems, and contains Space-Division Multiple Access (SDMA) and Non-Orthogonal Multiple Access (NOMA) as spe- cial cases. RSMA relies on linearly precoded rate-splitting with Successive Interference Cancellation (SIC) to decode part of the interference and treat the remaining part of the interference as noise. Recently, RSMA has been shown to outperform both SDMA and NOMA rate-wise in a wide range of network loads (underloaded and overloaded regimes) and user deployments (with a diversity of channel directions, channel strengths and qualities of channel state information at the transmitter). Moreover, RSMA was shown to provide spectral efficiency and QoS enhancements over NOMA at a lower computational complexity for the transmit scheduler and the receivers. In this paper, we build upon those results and investigate the energy efficiency of RSMA compared to SDMA and NOMA. Considering a multiple-input single-output broadcast channel, we show that RSMA is more energy-efficient than SDMA and NOMA in a wide range of user deployments (with a diversity of channel directions and channel strengths). We conclude that RSMA is more spectrally and energy-efficient than SDMA and NOMA.
KW - Energy efficiency
KW - Noma
KW - Rate-splitting multiple access
KW - Sdma
UR - http://www.scopus.com/inward/record.url?scp=85056716884&partnerID=8YFLogxK
U2 - 10.1109/ISWCS.2018.8491100
DO - 10.1109/ISWCS.2018.8491100
M3 - Conference contribution
AN - SCOPUS:85056716884
T3 - Proceedings of the International Symposium on Wireless Communication Systems
BT - 2018 15th International Symposium on Wireless Communication Systems, ISWCS 2018
PB - VDE Verlag GmbH
T2 - 15th International Symposium on Wireless Communication Systems, ISWCS 2018
Y2 - 28 August 2018 through 31 August 2018
ER -
