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Orthogonal Frequency Division Multiple Access (OFDMA) refers to a radio transmission technique based on dividing the frequency channel into narrowband sub-channels. In this dissertation studied that Margin Adaptive - Superposition Coding (MA-SC) algorithm and Rate Adaptive - Superposition Coding (RA-SC) algorithm, where at most two users can share each subcarrier as compared to MA and RA algorithm, where each subcarrier is shared by only single user without SC scheme. Then apply SC scheme over MA and RA to achieve maximum system throughput with separate power constraint for real and non-real time users, ensuring that QoS requirement for real time and proportional fairness among non-real time users is satisfied.
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