| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 107 === It has been conrmed that the non-orthogonal multiple access (NOMA) technology can
achieve a better user throughput than the orthogonal multiple access (OMA) technology.
Hence, it has been considered a main multiple access technology in 5G standard. In this
thesis, over an uplink Gaussian Multiple Access Channel (GMAC), we consider a NOMA system, in which the signals from two users are multiplied by spreading sequences before transmissions. Therefore, the two transmissions are not necessarily perfectly correlated. The optimal power allocation that respectively maximizes the achievable rate and the constellation constrained sum capacity, subject to perfect knowledge of cross correlation, is then determined. How a mismatched knowledge on the cross-correlation affect the system performance is next addressed.
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