Abstract
Two wireless nodes outside each others radio range can communicate via a node in between, known as a relay node. A relay node may be a simple repeater or a fully functional entity depending upon the deployment scenario. In a two-way relay communication (TWRC), Physical-Layer network coding (PNC) exploits the superimposed nature of electromagnetic waves at the relay node to improve the throughput performance. Synchronization of information from two end users is critical when exchanging information via a relay node. Traditionally in PNC, modulation constellations sent from the two end users are chosen to be the same. In this paper, we investigate the performance of a PNC-based TWRC system in a Rayleigh fading scenario when the modulation constellation of one end user is rotated with respect to the modulation constellation at the other end user. The analysis shows that the rotated-QPSK gives distinct decision regions when the modulation constellation of QPSK and rotated-QPSK are superimposed, unlike the traditional (QPSK)(QPSK) transmission. Simulation results for the symbol error rate (SER) at the relay node shows the loss in performance of (QPSK)-(rotated-QPSK) scheme compared to the (QPSK)(QPSK) scheme due to phase rotation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
