Abstract
Non-orthogonal multiple access (NOMA) technology provides an effective solution to massive access with a high data rate demand in new-generation mobile networks. The paper combinations with NOMA and simultaneous wireless information and power transfer (SWIPT) relay to maximize the sum rate in the downlink system. To that end, it is critical how to select effectively users access system and power allocation for the access user. This paper proposes a user selection and dynamic power allocation (USDPA) scheme in the NOMA-SWIPT relay system based on neural network because traditional optimization methods have difficulty solving nonlinear and non-convex problems. We establish a user selection network utilizing a deep neural network (DNN) and propose a power allocation network using deep reinforcement learning. The simulation results show that the proposed scheme achieves better performance than other related schemes, especially for high quality of service requirements.
Highlights
Due to the massive amount of wireless equipment accessed via the internet, researchers have focused on the high demand for charging wireless mobile terminals (MTs)
The reason is that the power allocation factor is less than 1 and does not take 0 and 1, which means that the sum rate of one user access will not be the maximum
5 Conclusion We propose a user selection and dynamic power allocation (USDPA) scheme in the simultaneous wireless information and power transfer (SWIPT)-Non-orthogonal multiple access (NOMA) relay system to maximize the sum rate in the downlink
Summary
Due to the massive amount of wireless equipment accessed via the internet, researchers have focused on the high demand for charging wireless mobile terminals (MTs). As a promising green communication solution, simultaneous wireless information and power transfer (SWIPT) was introduced to increase the battery life. SWIPT can achieve significant gains in energy consumption and spectrum efficiency (SE), improve interference management, and reduce transmission delays by enabling the simultaneous transmission of power and information [1]. A cooperative relaying (CoR) method combined with SWIPT was proposed to increase network reliability and expand the signal coverage area [2, 3]. The non-orthogonal multiple access (NOMA) scheme has been regarded as a promising technique to improve the SE for 5G and future communication systems because the signals of different MTs in NOMA can be multiplexed on the same resource elements [4]. Some researchers combined NOMA with SWIPT relay technology to improve the SE and achieve green communication [4, 5]
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