Matrix analysis
Adaptive filter theory
Hot topic: physical-layer network coding
Proceedings of the 12th annual international conference on Mobile computing and networking
Optimal channel estimation and training design for two-way relay networks
IEEE Transactions on Communications
Semidefinite relaxation based multiuser detection for M-ary PSK multiuser systems
IEEE Transactions on Signal Processing - Part I
IEEE Transactions on Information Theory
Channel estimation for two-way relay OFDM networks
EURASIP Journal on Wireless Communications and Networking - Special issue on physical-layer network coding for wireless cooperative networks
Two-way MIMO relay precoder design with channel state information
IEEE Transactions on Communications
Review: A survey and tutorial of wireless relay network protocols based on network coding
Journal of Network and Computer Applications
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This work considers two-way relay channels (TWRC), where two terminals transmit simultaneously to each other with the help of a relay node. For single antenna systems, we propose several new transmission schemes for both amplify-and-forward (AF) protocol and decode-and-forward (DF) protocol where the channel state information is not required. These new schemes are the counterpart of the traditional non-coherent detection or differential detection in point-to-point communications. Differential modulation design for TWRC is challenging because the received signal is a mixture of the signals from both source terminals. We derive maximum likelihood (ML) detectors for both AF and DF protocols, where the latter can be considered as performing differential network coding at the physical layer. As the exact ML detector is prohibitively complex, we propose several suboptimal alternatives including decision feedback detectors and prediction-based detectors. All these strategies work well as evidenced by the simulation results. The proposed protocols are especially useful when the required average data rate is high. In addition, we extend the protocols to the multiple-antenna case and provide the design criterion of the differential unitary space time modulation (DUSTM) for TWRC.