標題: | On Gray Labeling for Downlink Non-Orthogonal Multiple Access Without SIC |
作者: | Shieh, Shin-Lin Lin, Chia-Hung Huang, Yu-Chih Wang, Chin-Liang 傳播研究所 Institute of Communication Studies |
關鍵字: | Non-orthogonal multiple access;Gray labeling;successive interference cancellation |
公開日期: | 九月-2016 |
摘要: | The impact of labeling a multilevel coding scheme with pulse amplitude modulation constellation in downlink non-orthogonal multiple access (NOMA) systems is studied. Particular interest is paid to the case where the strong user\'s receiver does not perform successive interference cancellation (SIC) before decoding its desired message. With judiciously chosen parameters, it was shown in a recent work that the considered scheme can approach the capacity region to within a constant gap. In this letter, analytic and extensive simulation results are given to show that Gray labeling provides better performance than non-Gray labeling and natural labeling for the scheme in terms of the symbol error rate, block error rate, and epsilon-feasible rate. Simulation results also indicate that the performance gap between the case with SIC and that without SIC for Gray labeling can be further bridged, which suggests the possibility of avoiding SIC in downlink NOMA. |
URI: | http://dx.doi.org/10.1109/LCOMM.2016.2584040 http://hdl.handle.net/11536/134247 |
ISSN: | 1089-7798 |
DOI: | 10.1109/LCOMM.2016.2584040 |
期刊: | IEEE COMMUNICATIONS LETTERS |
Volume: | 20 |
Issue: | 9 |
起始頁: | 1721 |
結束頁: | 1724 |
顯示於類別: | 期刊論文 |