一种基于艾森斯坦整数的SCMA码本的优化

Optimization of SCMA Codebook Based on Eisenstein Integers

稀疏码分多址(SCMA)作为一种具有广阔前景的多用户通信技术,有助于实现未来大规模机器类型网络系统。本文在艾森斯坦整数的基础上,提出了一种新的码本,它利用了不同资源块上相同用户的相同码字之间的距离,通过调整各码字之间的功率,让各用户之间,以及不同码字之间均保持相同的功率。通过数值仿真结果表明,与已有的码本相比,我们提出的码本在AWGN信道下具有更大的增益。

As a promising multi-user communication technology,sparse code division multiple access(SCMA)is helpful to real⁃ize large-scale machine type network system in the future.Based on Eisenstein integers,a new codebook is proposed in this paper.It uses the distance between the same codewords of the same user in different resource blocks.By adjusting the power between code⁃words,the same power can be maintained between users and between different codewords.Numerical simulation results show that the proposed codebook has higher gain in Gaussian channel than the existing codebook.