Bit error rate analysis of PLNC based cognitive radio relay systems in multi-source multi-destination scenario

In this paper, average bit error rate (BER) of Physical Layer Network Coding (PLNC) based half duplex Cognitive Radio Relay (CRR) system in multi-source multi-destination scenario is analyzed in overlay and underlay modes. Two source and two destination nodes are considered in the system model. With the help of Decode and Forward (DF) relay, two source nodes send data to both the destination nodes in two time slots. The DF relay decodes the data symbols from the two source nodes and transmits the PLNC encoded symbol to both the destination nodes in the second time slot. Analytical expressions are derived for average BER of the proposed PLNC based CRR system in overlay and underlay mode. The performance of the proposed system is compared with non-PLNC based system.