TY - JOUR AU - Son, Pham Ngoc AU - Duy, Tran Trung AU - Truong, Phuc Quang AU - Truong, Son Ngoc AU - Tuan, Pham Viet AU - Phan, Van-Ca AU - Ho-Van, Khuong PY - 2021/02/02 TI - Combining Power Allocation and Superposition Coding for an Underlay Two-way Decode-and-forward Scheme JF - VNU Journal of Science: Computer Science and Communication Engineering; Vol 37 No 1 (2021)DO - 10.25073/2588-1086/vnucsce.253 KW - N2 - In this paper, we analyze an underlay two-way decode-and-forward scheme in which secondary relays use successive interference cancellation (SIC) technology to decode data of two secondary sources sequentially, and then generate a coded signal by superposition coding (SC) technology, denoted as SIC-SC protocol. The SIC-SC protocol is designed to operate in two time slots under effects from an interference constraint of a primary receiver and residual interference of imperfect SIC processes. Transmit powers provided to carry the data are allocated dynamically according to channel powers of interference and transmission, and a secondary relay is selected from considering strongest channel gain subject to increase in decoding capacity of the first data and decrease in collection time of channel state information. Closed-form outage probability expressions are derived from mathematical manipulations and verified by performing Monte Carlo simulations. An identical scheme of underlay two-way decodeand-forward relaying with random relay selection and fixed power allocations is considered to compare with the proposed SIC-SC protocol, denoted as RRS protocol. Simulation and analysis results show that the non-identical outage performances of the secondary sources in the proposed SIC-SC protocol are improved by increasing the number of the secondary relays and the interference constraint as well as decreasing the residual interference powers. 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