Sparse code multiple access (SCMA) is a competitive non-orthogonal multiple access (NOMA) technique for the internet of medical things (IoMT). The essential problem of SCMA is to design the large scale codebooks with high coding gain. In this article, a new lattice-based codebook design method is proposed to generate the multi-dimensional constellation. Firstly, an optimization problem about multi-dimensional constellations is constructed to quest the real constellation with maximum coding gain. Secondly, by combining the dimensions of the real constellations, we construct the basic complex mother constellation. The mother constellation can increase the power diversity and ensure the constant Euclidean distance between constellation points. Finally, we generate the mother codebooks with designed mapping matrix by constellation rotation. Simulation results demonstrate that the designed codebook has higher coding gain with large codebook size, especially under the high signal to noise ratio (SNR) condition.
|Original language||English (US)|
|Title of host publication||2019 IEEE/CIC International Conference on Communications Workshops in China, ICCC Workshops 2019|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||5|
|State||Published - Aug 2019|
|Event||2019 IEEE/CIC International Conference on Communications Workshops in China, ICCC Workshops 2019 - Changchun, China|
Duration: Aug 11 2019 → Aug 13 2019
|Name||2019 IEEE/CIC International Conference on Communications Workshops in China, ICCC Workshops 2019|
|Conference||2019 IEEE/CIC International Conference on Communications Workshops in China, ICCC Workshops 2019|
|Period||8/11/19 → 8/13/19|
Bibliographical noteFunding Information:
This work was supported by Natural Science and Technology Major Projects of China under Grants: 2017ZX03001001-004.
- Multi-dimensional constellations