QoS-Aware Energy Efficient Power Allocation for OFDM Based DF Relay Networks

Zheng, Zhengguang; Wang, Yuyi; Lin, Liyan; Wei, Fangzheng; Zhang, Yun; Cai, Kun; Yu, Donghui; Yan, Yu

doi:10.1109/icct52962.2021.9657997

Cited by 1 publication

(4 citation statements)

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“…In the literature, different scenarios of transmission with help of relay nodes can be distinguished. Figure 17 illustrates four transmission modes in the multi-user OFDMA relay network which can be found in the literature: (i) direct transmission [80]- [83], (ii) relayed transmission [80]- [85], (iii) relayed transmission with direct link [86]- [88], (iv) relay beamforming [89].…”

Section: Multi-user Ofdma Relay Networkmentioning

confidence: 99%

“…• the increase in the total power consumption resulting from the BB and RF signal processing in the relay node • the time-consuming signal processing may require more than two time slots to deliver the data to end-user • the complex structure of the relay node total power consumption but the potential errors can be eliminated in the relay node and thus they are not propagated to the end-user. For DF relaying protocol the data rate of user u using subcarrier pair (n, k) may be expressed as [83], [85], [88], [94], [97], [98]:…”

Section: Pros Consmentioning

confidence: 99%

“…In the contrast to the common approach in [100] the power allocated on a given SC is limited. • the minimum data rate constraint which has been taken into account in [82], [84], [86], [88], [90], [98]. Due to two time slots that are required to deliver the data to the end-user in the relayed transmission mode, two approaches are considered in the context of the data rate constraints.…”

Section: Constraints In a Multi-user Ofdma Relay Networkmentioning

confidence: 99%

“…On the one hand, it ensures that a single transmission mode, usually direct or relayed, is chosen for each user-subcarrier pair while on the other hand guarantees that each subcarrier is only allocated to at most one end-user. In this form, the subcarrier assignment constraints have been considered in [80]- [82], [88], [89], [98], [100].…”

Section: Constraints In a Multi-user Ofdma Relay Networkmentioning

confidence: 99%

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Energy-Efficient OFDM Radio Resource Allocation Optimization With Computational Awareness: A Survey

2022

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In this paper, we review radio resource optimization methods for energy-efficient wireless communication in links and networks using the Orthogonal Frequency Division Multiplexing (OFDM) and Orthogonal Frequency Division Multiple Access (OFDMA) techniques. We first consider the energyefficiency metrics and optimization goals. We discuss the increasingly complex systems, starting from (i) a single OFDM link, (ii) an OFDMA single-hop network to (iii) multi-hop relay OFDMA interference networks.In each case, we elaborate on the transmission rate estimation, power consumption modelling, existing optimization constraints and the optimization solutions. Specifically, in the power-consumption modelling, we include the signal-processing (and related computing) power. We discuss the practicality of the considered solutions. We also touch upon the problem of nonlinear power amplifier characteristics (causing distortions typical for OFDM signals) to be taken into account for energy-efficient resource allocation. We discuss trade-offs and provide recommendations for future energy-efficient OFDM networks design. We also discuss the future works and challenges in the context of energy efficiency resource allocation for OFDM/OFDMA and their derivative techniques. We conclude that the presented design practices should include computational awareness in the networks to trade-off between information communication, information processing and the required network management energy-efficiency.

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