User Grouping and Resource Allocation Algorithms for Multicarrier MIMO-NOMA Systems on Downlink Beamforming
| Autor: | Jui-Hung Tseng, 曾睿弘 |
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| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 The non-orthogonal multiple access (NOMA) allocation becomes a promising technique on downlink transmission. Additionally, recent studies show that inter-group interference and inter-user inter-group play significant roles in minimizing the total required transmit power. In the multiple-input and multiple-output NOMA (MIMO-NOMA) systems based on orthogonal frequency division multiple access (OFDMA) systems with user grouping, subcarrier allocation and bit allocation schemes to reduce the required transmit power. Besides, we define each subcarrier is allocated to a cluster which contains groups of two users for data transmission with a lower power of modulation modes. The zero-forcing beamforming (ZFBF) and the successive interference cancellation (SIC) are used to eliminate interference from the strong user with the larger channel gain between two users in a group. Since the system is based on OFDMA systems, the primary user is more essential than the secondary and we ensure that all assigned subcarriers transmit data to the primary user. So the secondary user will transmit data with the primary user together on several subcarriers but it’s impossible to transmit data individually. Therefore, how to allocate the resource between the primary and secondary users under two conditions in the NOMA allocation will be discussed. Based on the simulation results, the proposed scheme outperforms the Multiple-User Orthogonal Multiple Access (MU-OMA) system with the NOMA allocation by decreasing the transmit power. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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