Capacity Enhancement of D2D Aided Coordinated Direct and Relay Transmission Using NOMA

Zou, Lisha; Chen, Jian; Lv, Lu; He, Bingtao

doi:10.1109/lcomm.2020.3000996

Cited by 31 publications

(21 citation statements)

References 11 publications

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“…1, we consider a single-cell NOMA-based CDRT (NCDRT) system, which consists of one BS (S), one CCU (U 1 ), one CEU (U 2 ) and one decode-and-forward (DF) relaying user (R). Similar to [30] and [31], a CCU close to U 2 can be selected as the relaying user, and the system model can be considered as a simple connected D2D-assisted cellular model. Due to the significant shadowing, the direct link between the BS and U 2 does not exist [23].…”

Section: A System Configurationmentioning

confidence: 99%

“…Since the proposed scheme is a TDD-based NOMA system, the BS can also use channel reciprocity to obtain the uplink channel coefficients based on downlink channel estimation [40]. [30], [31]. Thus, R is allowed to transmit its own signal to U 2 , which can offload the traffic and further enhance the SE.…”

Section: Fourth Phase (T 4 )mentioning

confidence: 99%

“…where Ψ = {x 2 , x 3 , x 4 , u 1 , u 3 }, and Π1 and Π2 denote perfect SIC and imperfect SIC, respectively. Since the D2D message x 4 contributes to the overall system performance, C x4 is also considered in (39) as in [30] and [31].…”

Section: Average Se Of the Proposed Schemementioning

confidence: 99%

“…A dynamic scheme was proposed by Xu et al in [28] to enhance the system reliability of downlink NOMA-based CDRT, and a relay selection strategy was studied by Yang et al in [29] to improve the outage performance of the CEU. The capacity scaling for a new device-to-device (D2D) assisted CNOMA scheme was analyzed by Kim et al in [30], and Zou et al used the similar frame to study the application of D2D communication in downlink NOMA-based CDRT system [31]. Moreover, a satellite-aided CDRT system using NOMA was proposed by Li et al in [32] to support robust communication for the specific environment.…”

mentioning

confidence: 99%

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Coordinated Direct and Relay Transmission With NOMA and Network Coding in Nakagami-m Fading Channels

Zhao

et al. 2021

IEEE Trans. Commun.

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Although the use of coordinated direct and relay transmission (CDRT) in non-orthogonal multiple access (NOMA) can extend the coverage, its duplicated transmission reduces the spectrum efficiency (SE) of NOMA. To improve the SE, we propose a spectrum-efficient scheme for NOMA-based CDRT over Nakagami-m fading channels. In this scheme, the base station (BS) connects with a cell-center user (CCU) directly while communicating with a cell-edge user (CEU) via a relay and the CCU. Then, the relay and the CCU use network coding to process and retransmit the signals sent by the BS first and the CEU later. Finally, the BS and the relay simultaneously broadcast downlink signals. We derive the closed-form expressions for the average SE, the user fairness index and the energy efficiency (EE) as well as the asymptotic average SE using both perfect and imperfect successive interference cancellation (SIC). Simulations verify the correctness of our theoretical analysis and the superiority of the proposed scheme in SE and EE.

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Section: A System Configurationmentioning

confidence: 99%

Section: Fourth Phase (T 4 )mentioning

confidence: 99%

Section: Average Se Of the Proposed Schemementioning

confidence: 99%

mentioning

confidence: 99%

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Coordinated Direct and Relay Transmission With NOMA and Network Coding in Nakagami-m Fading Channels

Zhao

et al. 2021

IEEE Trans. Commun.

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“…Under the current cellular network architecture, the deployment density increase of wireless devices (e.g., cellphones, unmanned equipment, and sensor array) results in the much greater data traffic pressure of the central base station. us, the traditional direct connection strategies are usually not available, especially on the energy consumption management aspect [28,29]. In order to handle this difficulty, the D2D networking exploiting wireless devices as the relay nodes has to be proposed as a potentially applicable approach.…”

Section: Aco/aia Algorithmic D2dmentioning

confidence: 99%

Energy-Saving D2D Wireless Networking Based on ACO and AIA Fusion Algorithm

et al. 2021

Security and Communication Networks

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Lower energy consumption and higher data rate have been becoming the key factors of modern wireless mobile communication for the improvement of user experiences. At present, the commercialization of 5G communications is gradually promoting the development of Internet of things (IoT) techniques. Due to the limited coverage capability of direct wireless communications, the indirect device-to-device (D2D) communications using information relay, in addition to the single 5G base station deployment, have been introduced. Along with the increase of information nodes, the relay devices have to undertake the nonnegligible extra data traffic. In order to adjust and optimize the information routing in D2D services, we present an algorithmic investigation referring to the ant colony optimization (ACO) algorithm and the artificial immune algorithm (AIA). By analyzing the characteristics of these algorithms, we propose a combined algorithm that enables the improved the iterative convergence speed and the calculation robustness of routing path determination. Meanwhile, the D2D optimization pursuing energy saving is numerically demonstrated to be improved than the original algorithms. Based on the simulation results under a typical architecture of 5G cellular network including various information nodes (devices), we show that the algorithmic optimization of D2D routing is potentially valid for the realization of primitive wireless IoT networks.

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