Abstract
This paper proposes a new transmission strategy for device-to-device (D2D) multicast cooperative communication systems based on Simultaneous Wireless Information and Power Transfer (SWIPT) technology. The transmission block is divided into two slots. In the first slot, the source user transmits the information and energy to the help user by SWIPT. In the second slot, the help user uses the cellular spectrum and forwards the information to multiple receivers by using harvested energy. In this paper, we aim to maximize the total system rate, and to tackle the problem, we propose a two-step scheme: In the first step, the resource allocation problem is solved by linear programming. In the second step, the power-splitting coefficient value is obtained by taking the benefit of help user into account. Numerical results show that the proposed strategy not only effectively improves the overall throughput and spectrum efficiency but also motivates the cooperation.
Highlights
Wireless Power Communication (WPC), where the smart terminals can harvest the energy from the far-field RadioFrequency (RF) signals provided by energy access point, becomes a new approach to avoid replacing or recharging the batteries, reduce total cost, and prolong the lifetimes [1]
Each channel takes a different frequency band that is orthogonal to each other, presenting a waste of spectral resources to some extent. Some works such as [10] consider throughput maximization while allowing D2D communication to underlay the cellular network; the results show that the total throughput can be increased
In this paper, we fully consider the benefits of the help users and aim at maximizing their benefits
Summary
Wireless Power Communication (WPC), where the smart terminals can harvest the energy from the far-field RadioFrequency (RF) signals provided by energy access point, becomes a new approach to avoid replacing or recharging the batteries, reduce total cost, and prolong the lifetimes [1]. Each channel takes a different frequency band that is orthogonal to each other, presenting a waste of spectral resources to some extent Some works such as [10] consider throughput maximization while allowing D2D communication to underlay the cellular network; the results show that the total throughput can be increased. In SWIPT-based energy-harvesting D2D underlay network [21], the problem of joint power control and spectrum resource allocation is solved. Different from the previous works on cooperative communication, we proposed an innovation transmission strategy and incentive mechanism via combined D2D multicast technology with SWIPT, which can effectively improve the spectrum efficiency, lower the energy consumption, reduce the communication delay, largely release the burden of the BS, and reduce the cost of communication. We will focus on the analysis of the cochannel interference brought by D2D multicast transmission and study the mechanism in user’s collaboration
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