Joint Channel Estimation and Data Detection for MIMO-OFDM Two-Way Relay Networks

In this paper, the authors consider Multi-Input Multi-Output (MIMO) two-way relay networks with Orthogonal Frequency-Division Multiplexing (OFDM) modulation scheme. The networks consist of two end users exchanging their information via a relay. One information exchange between two end users is divided into two Phases. In Phase 1, two users send their information to the relay. The relay then amplifies and broadcasts its received signals to the two users in Phase 2, i.e., the relay works in the Amplify-and-Forward (AF) mode. By doing so, two-way relay networks require half as many time slots to accomplish one information exchange as the traditional one-way relay networks.