Physical-Layer Network Coding for the Downlink of Dual Connectivity Scenarios
Kanghua Chen, Ying Wang, Junwei Zhao, Zhengwei Lyu, Xiaojin Zheng · 2019
Dual connectivity (DC) has attracted a lot of attention with the higher demand for reliable data transmission in 5G. We consider the application of network coding technology on DC scenario. Aiming at a special topology of DC, a new physical layer downlink network coding scheme (PHY-DL-NC) is proposed. In the proposed scheme, network coding technology is adopted in the physical layer of the base station (BS) through designing a new user data modulation mode and a corresponding mapping demodulation scheme. Compared with the traditional scheme, the proposed scheme guarantees the bit error rate (BER) performance when there exists the same frequency band signals interference. Simulation results show that the PHY-DL-NC scheme has a significantly lower BER when the co-frequency signal interference is large. Besides, it can significantly reduce backhaul load in the absence of signal interference, while achieving a similar performance to the ideal traditional transmission scheme in terms of BER.