| Summary: | 碩士 === 元智大學 === 通訊工程學系 === 105 === We propose a method focuses on increasing the attachable number of subscribers and the total information rates of the cellular system using NOMA or SCMA based on the feedback channel quality indicator (CQI). Non-orthogonal multiple access, low density parity check codes and sparse code multiple access are introduced in Chapter 2, where sparse code multiple access are adopted for 6 users and 4 resources and LDPC codes are adopted from IEEE 802.11n. The modulation Coding Scheme which depends on the feedback CQI information uses three different kinds of modulation (QPSK, 16QAM and 64QAM) and coding rates (1/2, 2/3 and 3/4). In simulation, path loss model is according to 3GPP TR 36.931 Release 9 in macro cell parameters. The path loss being inversely proportional to the distance of 3.76 (r^3.76) from the base station to the subscriber. The user density in the cell is assumed to be either constant or inversely proportional to the distance (r). The results indicate that our method can effectively achieves the targets of increasing the attachable number of users and/or the total information rates.
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