Institute of Electrical & Electronic Engineers
This paper investigates optimal resource allocation in Orthogonal Frequency Division Multiplexing (OFDM) based multiple two-way relay systems operating with Analog Network Coding (ANC) protocol. The authors formulate a joint optimization problem considering power allocation, relay selection and subcarrier paring to maximize the sum capacity under individual power constraints on each node. By applying dual method, an unified optimization framework is provided and the problem is solved efficiently. Based on this framework, they further propose three suboptimal algorithms.