Application of Superposition Coding for Subcarrier and Bit Allocation in Downlink OFDM Systems

Orthogonal Frequency Division Multiplexing (OFDM) is well known for multicarrier modulation technique in which a high data rate stream is divided into different parallel lower data stream. In this paper, the authors study the Margin Adaptive - Superposition Coding (MA-SC) algorithm and Rate Adaptive - Superposition Coding (RA-SC) algorithm, where at most two user can share each subcarrier as compared to MA and RA algorithm, where each subcarrier is shared by only single user without SC scheme.