稀疏码分多址技术发展及前景

提升频谱资源利用率是未来移动通信亟待解决的一项重要目标。其中，稀疏码分多址技术具备频谱利用率高、抗干扰性能力强、系统兼容性好等优点，已成为一种非常有前景的非正交多址方案。为了在未来移动通信中进一步发展稀疏码分多址技术，本文综述了现有稀疏码分多址技术的研究成果，对其研究现状进行了总结分析。其中，分析了现有的码本设计方案，指出了其设计特点以及目前尚存的问题，并给出相应的解决方案；在解码算法方面，给出了目前两种常见的解码算法，简述了其基本原理，并介绍了一些新兴的解码算法；就SCMA与其他技术结合而言，从三个方面总结了目前SCMA技术的研究成果，并探讨了SCMA技术在应用层面潜在的发展的方向。最后，本文总结了稀疏码分多址技术的发展挑战和趋势。

Sparse Code Multiple Access Recent Developments and Future Potentials

Improving spectrum efficiency is an urgent problem to be solved in future communication systems. Due to the advantages of high spectrum utilization, strong anti-interference and excellent system compatibility, sparse code multiple access (SCMA) has been viewed as a promising technology in non-orthogonal multiple access (NOMA). In order to develop SCMA in future mobile communication, this paper provides a comprehensive survey of SCMA, summarizes and analyzes the state of the art technologies in SCMA. Firstly, the existing codebook design schemes are analyzed in detail, where the designing procedures are provided. Besides, we outline the existing problems in codebook design and provide the corresponding solutions. In terms of decoding algorithms, two standard decoding algorithms are highlighted, including the basic principle, and some emerging decoding algorithms are also introduced. In the aspect of combining SCMA with other technologies, the current research is summarized in three aspects. Then, the potential development of SCMA applications is discussed. Finally, the challenges and trends of SCMA technology is also provided.