TY - JOUR
T1 - Beamforming for combating inter-cluster and intra-cluster interference in hybrid NOMA systems
AU - Chen, Zhiyong
AU - Ding, Zhiguo
AU - Dai, Xuchu
N1 - Funding Information:
The work of Z. Chen and X. Dai was supported by the National Natural Science Foundation of China under Grant 61471334. The work of Z. Ding was supported in part by U.K. EPSRC under Grant EP/L025272/1 and in part by H2020-MSCA-RISE-2015 Project under Grant 690750.
Publisher Copyright:
© 2013 IEEE.
PY - 2016
Y1 - 2016
N2 - In this paper, downlink beamforming (BF) for hybrid non-orthogonal multiple access (NOMA) systems is considered, in order to combat inter and intra cluster interference. First, to minimize the inter- and intra-cluster interference, the projection hybrid NOMA (PH-NOMA) BF algorithm is introduced, by combining conventional zero-forcing BF (ZFBF) and hybrid NOMA (H-NOMA) precoding. Second, to further reduce the overall interference, two user pairing algorithms, termed projection-based pairing algorithm (PBPA) and inversion-based pairing algorithm (IBPA), are also proposed, by adopting the properties of quasi-degradation developed previously. Consequently, the proposed BF algorithm is obtained by combining PH-NOMA and PBPA/IBPA. Moreover, the system performance in terms of outage probability and diversity is analyzed for both the proposed BF algorithms and conventional ZFBF. Finally, computer simulations are conducted to demonstrate the efficiency of the proposed BF algorithms and to validate the correctness of the performance analysis.
AB - In this paper, downlink beamforming (BF) for hybrid non-orthogonal multiple access (NOMA) systems is considered, in order to combat inter and intra cluster interference. First, to minimize the inter- and intra-cluster interference, the projection hybrid NOMA (PH-NOMA) BF algorithm is introduced, by combining conventional zero-forcing BF (ZFBF) and hybrid NOMA (H-NOMA) precoding. Second, to further reduce the overall interference, two user pairing algorithms, termed projection-based pairing algorithm (PBPA) and inversion-based pairing algorithm (IBPA), are also proposed, by adopting the properties of quasi-degradation developed previously. Consequently, the proposed BF algorithm is obtained by combining PH-NOMA and PBPA/IBPA. Moreover, the system performance in terms of outage probability and diversity is analyzed for both the proposed BF algorithms and conventional ZFBF. Finally, computer simulations are conducted to demonstrate the efficiency of the proposed BF algorithms and to validate the correctness of the performance analysis.
KW - beamforming
KW - Non-orthogonal multiple access
KW - user pairing
UR - http://www.scopus.com/inward/record.url?scp=84991575737&partnerID=8YFLogxK
U2 - 10.1109/ACCESS.2016.2598380
DO - 10.1109/ACCESS.2016.2598380
M3 - Article
AN - SCOPUS:84991575737
SN - 2169-3536
VL - 4
SP - 4452
EP - 4463
JO - IEEE Access
JF - IEEE Access
M1 - 7546900
ER -