Physical Layer Differential Network Coding for Two-Way Relay Channels

Tao Cui, Feifei Gao, Chintha Tellambura
2008 IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference  
In this work, we consider differential modulation in two-way relay channels (TWRC). In single antenna systems, we propose non-coherent schemes for both amplify-and forward (AF) and decode-and-forward (DF) where the channel state information is not required. These new schemes are counterparts of the traditional non-coherent detection in point to point communications. The difficulty with differential modulation design in TWRC is that the received signal is a mixture of the signals from both
more » ... terminals. We derive maximum likelihood (ML) detectors for both AF and DF. The DF protocol can be considered as performing differential network coding at the physical layer. In addition, we propose several suboptimal alternatives including decision feedback and prediction based detectors. All these strategies work well as evidenced by simulation results. We also extend the schemes to the multiple-antenna case and provide design criterion of differential unitary space time modulation. This full text paper was peer reviewed at the direction of IEEE Communications Society subject matter experts for publication in the IEEE "GLOBECOM" 2008 proceedings. 978-1-4244-2324-8/08/$25.00
doi:10.1109/glocom.2008.ecp.884 dblp:conf/globecom/CuiGT08 fatcat:pc4c7eedozezngeh2rxm6ildkm