Optimal energy efficient joint power allocation for two‐hop single‐antenna relaying systems

Through harvesting energy from the environment, the wireless system can be sustainable and work for a long time. The spectrum sharing is promising to cope with the contradiction between the shortage of spectrum and the ever-growing transmission requirements. Jointly considering the energy and spectrum efficiencies, we proposed in this work an energy harvesting (EH)-based spectrum sharing scheme. The cognitive radio network with one primary link and one secondary link is studied, where the primary base station (BS) serves its primary user (PU), and the secondary access point (AP) intends to communicate with a secondary user. The PU should harvest the wireless energy for the uplink data transmission, while all the other terminals have the stable power supply. The AP can wirelessly transfer energy to the PU along with the BS to improve the EH efficiency, and further, it can relay the primary data to the BS to improve the spectrum efficiency. The energy and data cooperation from the AP can significantly enhance the throughput of primary system, and hence, more spectrum can be released for the secondary data transmission. The resource allocation between the two systems for the energy transfer and data relaying is determined through maximising the throughput of secondary link while guaranteeing the performance of primary link. Under the peak power constraint, the system performance is analysed considering the dependence of the downlink energy transfer and the uplink data relaying. Numerical results are provided to reveal the impacts of various parameter settings to the system performance.

Section: Throughput With Spectrum Sharingmentioning

confidence: 99%

Section: Throughput With Spectrum Sharingmentioning

confidence: 99%

Strive for the spectrum sharing by transferring energy and relaying data for the primary user

Zhai

Liu

Lan

et al. 2015

“…Meanwhile, energy efficiency (EE) has also attracted much interest in the telecommunications community . Increasing EE has become an important and urgent task.…”

Section: Introductionmentioning

confidence: 99%

“…Increasing EE has become an important and urgent task. In relay communications, recent research efforts have focused on EE in half‐duplex relay systems . In , the main algorithms used to optimise EE are based on the Dinkelbach's method , which has been commonly used to solve fractional programming problems.…”

Section: Introductionmentioning

confidence: 99%

“…In , the main algorithms used to optimise EE are based on the Dinkelbach's method , which has been commonly used to solve fractional programming problems. In , the authors have proposed a dual method that maximises EE in amplify‐and‐forward relay systems. To the best of our knowledge, there is no open literature focusing on EE of FD relay systems.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Energy efficiency optimisation in full‐duplex relay systems

Jiang

Lau

Chen

et al. 2015

Energy efficiency of relay communications has attracted much interest recently. Most research efforts have focused on half‐duplex systems. As there has been significant progress in practical implementation of self‐interference cancellation, full‐duplex systems will have a promising potential in the near future. In this letter, energy efficiency of a full‐duplex relay system under the total power constraint and fixed circuitry power consumption is studied. An optimisation problem is formulated towards maximising the system energy efficiency. Unfortunately, this problem is non‐trivial and cannot be solved by conventional fractional programming methods, such as the Dinkelbach's method. To resolve this issue, an algorithm called sequential parametric convex approximation‐Dinkelbach is proposed in this letter. Simulation results show that the proposed algorithm can converge to the global optimum very quickly. Copyright © 2015 John Wiley & Sons, Ltd.

Power efficient CoMP‐joint transmission with two stage QoSs

Kim

Cho

2016

Power efficiency has become an important design goal for wireless communications, and a coordinated multi-point (CoMP) with joint transmission (JT) scheme can be implemented to improve the cell edge throughput by increasing the signal-to-interference ratio, which in turn leads to power savings through cooperative transmission. To this end, we propose a power control scheme in which the cooperating base station can reduce its own transmission power while remaining within two stage quality of service (QoS) constraints, including the call-blocking probability and outage probability. For the two QoS constraints, we introduce call admission control and signal-to-interference ratio models for CoMP-JT that consider a two-dimensional Markov chain and the sum of multiple exponential random components. The results of the call blocking and outage probabilities are used to obtain the power consumption model and analyse the performance for the CoMP-JT with the proposed power control technique. Both the analytical and numerical results show that the proposed power control strategy can reduce the power consumption for the cellular network with the two stage QoSs.