Improving the Error Performance and Sum Rate of NOMA System by Applying Encoding and Decoding Scheme with XOR Bit Operation

This paper proposes a scheme that adds XOR bit operations into the encoding and decoding process of conventional non-orthogonal multiple access (NOMA) system. Because the conventional NOMA combines and sends multiple data within limited resources, it has a higher data rate than orthogonal multiple access (OMA) at the expense of error performance. However, using the proposed encoding and decoding scheme, both error performance and sum rate can be improved. In the proposed scheme, the transmitter sends the original data and the redundancy data in which the exclusive OR (XOR) values of the data are compressed using the superposition coding (SC) technique. After this process, the data rate of users decreases due to redundancy data, but since the original data is sent without power allocation, the data rate of user with poor channel conditions increases compared to the conventional NOMA. As a result, the error performance and sum rate of the proposed scheme are better than those of the conventional NOMA.