Cooperative multicast non-orthogonal multiple access in cognitive radio

Chen, Yingyang; Wang, Li; Jiao, Bingli

doi:10.1109/icc.2017.7996607

Cited by 27 publications

(30 citation statements)

References 20 publications

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“…UB") of minimal ECPB of the DC-NOMA multicast strategy, and the asymptotic minimal ECPB of the OC-NOMA multicast strategy, where M = 3 and 6, K = 3, and β = 1. As seen from this figure, the actual minimal ECPB of direct NOMA multicast complies with the exact minimal ECPB derived in (9), while the actual minimal ECPB of DC-NOMA multicast and OC-NOMA multicast strategies are tightly upper bounded by the asymptotic upper-bound (37) and asymptotic expression (57), respectively. It can also be seen that the minimal ECPB of direct NOMA multicast strategy increases with the number of AUs.…”

Section: A Verification Of Theoretical Resultssupporting

confidence: 68%

“…Then, applying the fact that |S A | ≤ M into the right-hand side of (39), the upper bound for minimal ECPB of DC-NOMA multicast strategy is obtained as shown in (37). This completes the proof.…”

Section: Minimal Energy Consumption For Guaranteed Reliabilitymentioning

confidence: 64%

“…• Strategy-1: This strategy employs the best average reception selection (BARS) scheme in [37], in which the multicast user with best average channel gain from the BS is selected. If the selected multicast user is successful after the first phase, it will serve as a relay in the second phase.…”

Section: B Performance Comparisonmentioning

confidence: 99%

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Cooperative Non-Orthogonal Layered Multicast Multiple Access for Heterogeneous Networks

Yang

et al. 2019

IEEE Trans. Commun.

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This paper proposes a novel design of cooperative non-orthogonal layered multicast multiple access in a heterogeneous network, where the information is encoded into the messages of high-priority (HP) and low-priority (LP). Two types of multicast users coexist in the network: 1) regular users (RUs), which are located far away from the base-station (BS) and expect to decode only the HP message (due to the weak channels); 2) advanced users (AUs), which are located close to the BS and expect to decode both HP and LP messages. To improve the reliability of layered multicast, we consider that the successful AUs (those AUs who successfully decode the HP and LP messages) serve as potential relays to assist other AUs/RUs. Based on this idea, two novel cooperation strategies are proposed for different cases of channel information availability. For each proposed strategy, we derive closed-form exact outage probabilities of AUs and RUs, and then further analyze their diversity orders. Moreover, considering that the layered multicast is outage-constrained, we theoretically evaluate the energy consumption of both strategies and demonstrate their energy saving gains over the direct nonorthogonal multiple access for layered multicast. Finally, our theoretical analysis is verified by numerical results, and the advantages of the proposed strategies are also demonstrated.

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Section: A Verification Of Theoretical Resultssupporting

confidence: 68%

Section: Minimal Energy Consumption For Guaranteed Reliabilitymentioning

confidence: 64%

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Cooperative Non-Orthogonal Layered Multicast Multiple Access for Heterogeneous Networks

Yang

et al. 2019

IEEE Trans. Commun.

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“…In this scheme, to access to the primary spectrum the cooperation in the secondary network (SN) is required in such NOMA application. In addition, to enhance the secondary user fairness a two-stage cooperative strategy was investigated in a cooperative multicast CR-NOMA scheme as [33]. The exact expressions are derived to evaluate performance of two NOMA secondary destination users in term of outage probability [34].…”

Section: A Related Workmentioning

confidence: 99%

NOMA in Cooperative Underlay Cognitive Radio Networks Under Imperfect SIC

Lee

2020

IEEE Access

114

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In conventional cognitive radio (CR), the users in secondary network (SN) can only access the idle spectrum when users in primary network (PN) are absent. This novel strategy provides higher spectrum efficiency when detecting the presence of the PN. Hence, spectrum utilization of the traditional scheme can be further improved as exploiting application of non-orthogonal multiple access (NOMA). As combination of CR and NOMA, such CR-NOMA has been proposed to improve spectrum efficiency to adapt to requirements in 5G communications. In this study, the relaying scheme is employed in the SN of the proposed CR-NOMA and the relay is allowed to energy harvesting (EH) from the secondary transmitter to serve signal forwarding to distant secondary users. With this regard, the complex model of EH-assisted CR-NOMA is explored in outage behavior and throughput performance as awareness on imperfect successive interference cancellation (SIC) at the receiver. As most important results, the exact closed-form of the exact outage probability is derived for each NOMA destination by assuming that the channel coefficients among considered links follow Rayleigh distribution. Furthermore, performance gap between two NOMA users can be controlled by various parameters such as transmit power, energy harvesting coefficients and levels of imperfect SIC. Simulation results verify our analytical results. INDEX TERMS Energy harvesting, imperfect SIC, NOMA, outage probability, underlay cognitive radio.

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“…NOMA technology now has been adopted in the 3GPP long term evolution [3rd Generation Partnership Project (2015)]. Similarly, in order to make full use of radio resources, researchers introduce NOMA technology into cognitive radio network (CRN), which allows multiple secondary users to adopt overlapping transmission mode on the same frequency band of authorized users to realize multi-user spectrum sharing and further improve the system performance of CRN [Lv, Ma, Zeng et al (2018); ; Chen, Wang and Jiao (2017)]. In ], the authors introduce NOMA scheme into a cooperative spectrum-sharing networks and compare the advantages of NOMA scheme with orthogonal multiple access (OMA).…”

Section: Introductionmentioning

confidence: 99%

Outage Capacity Analysis for Cognitive Non-Orthogonal Multiple Access Downlink Transmissions Systems in the Presence of Channel Estimation Error

Zhang¹,

Dong²,

Wang³

et al. 2019

Computers, Materials &Amp; Continua

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In this paper, we propose a downlink cognitive non-orthogonal multiple access (NOMA) network, where the secondary users (SUs) operate in underlay mode. In the network, secondary transmitter employs NOMA signaling for downlink transmission, and the primary user (PU) is interfered by the transmission from SU. The expressions for the outage probabilities are derived in closed-form for both primary and secondary users in the presence of channel estimation error. Numerical simulation results show that the channel estimation error and the inter-network interference cause degradation of the downlink outage performance. Also the power allocation and the location have a significant impact on the outage probability. The numerical experiments demonstrate that the analytic expressions of the outage probabilities match with the simulation results.

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Cooperative multicast non-orthogonal multiple access in cognitive radio

Cited by 27 publications

References 20 publications

Cooperative Non-Orthogonal Layered Multicast Multiple Access for Heterogeneous Networks

Cooperative Non-Orthogonal Layered Multicast Multiple Access for Heterogeneous Networks

NOMA in Cooperative Underlay Cognitive Radio Networks Under Imperfect SIC

Outage Capacity Analysis for Cognitive Non-Orthogonal Multiple Access Downlink Transmissions Systems in the Presence of Channel Estimation Error

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