Implementation of OFDM-based Superposition Coding on USRP using GNU Radio

This report summarizes our PHY layer implementation of a OFDMbased superposition coding system. In theory, multi-user techniques such as superposition coding (SPC) are known to improve throughput in wireless networks. However, in order to understand their practical limitations, it is imperative to actually implement and experiment with such techniques in a realistic setting. In this report, we describe the physical layer design of superposition coding system in software de ned radio. Hardware issues in the implementation are also discussed.