Virtual User Emulation and Resource Allocation Designs for 5G Mobile Wireless Networks

The mobile wireless communication system with high-speed massive transmissions attracts immense attention in the fifth-generation (5G) new radio (NR) networks. However, it provokes difficulties to provide high-performance services for massive connections due to inter-carrier interference (ICI) caused by mobility factors. Furthermore, under the limited number of hardware antennas, it becomes essential to develop an effective testbed that is capable of emulating and evaluating an excessive number of users. In this paper, we propose virtual user equipment (VUE) emulation system with a VUE generator emulating massive VUE transmissions under a limited number of antennas. The precoding scheme is designed to transform the virtual channels of mobile VUEs to the realistic channels of antennas of the VUE generator. With the consideration of channel transformation estimation error and ICI, we propose the antenna selection and power/sub-carrier allocation (APSA) scheme aiming to maximize the achievable system sum rate. Simulation results demonstrate that the performance is influenced by VUE positions and channel errors in the designed VUE emulation system. Moreover, the proposed APSA scheme outperforms other methods in terms of quality-of-service (QoS) outage and sum rate.