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基于OQAM-OFDM的NOMA通信系统设计
历凯,王珏,徐晨
0
(南通大学 电子信息学院,江苏 南通 226019)
摘要:
针对传统基于正交频分复用(OFDM)调制波形的非正交多址接入(NOMA)通信系统存在的旁瓣衰减较慢问题,提出了一种基于交错正交幅度调制的正交频分复用(OQAM-OFDM)波形的NOMA系统设计方案。所提设计方法通过在典型NOMA系统设计中加入OQAM预调制和滤波器组滤波等处理,有效加快旁瓣衰减,实现了较好的频域聚焦性能。仿真结果表明,提出的设计方法不仅有效提高了系统的频谱利用率,而且在抵抗多径干扰时误码率有所降低。虽然重点研究了通信下行链路,但是所得结论同样适用于上行链路。
关键词:  非正交多址接入(NOMA)  交错正交幅度调制(OQAM)  正交频分复用(OFDM)  频域聚焦
DOI:
基金项目:国家自然科学基金(青年基金)资助项目(61401240)
Design of a non-orthogonal multiple access communication system based on OQAM-OFDM
LI Kai,WANG Jue,XU Chen
(School of Electronic and Information,Nantong University,Nantong 226019,China)
Abstract:
Aiming at the problem of slow side-lobe attenuation in the traditional Non-orthogonal Multiple Access(NOMA) communication system based on Orthogonal Frequency Division Multiplexing(OFDM) modulation waveform,a new design method based on Offset Quadrature Amplitude Modulation based OFDM(OQAM-OFDM) modulation waveform is proposed.The proposed design method adds OQAM pre-modulation and filter banks to the conventional design of NOMA system.The application of the filter banks makes the system achieve a good frequency domain concentration performance and accelerates the side-lobe suppression effectively.The simulation results show that the proposed design method not only improves the spectrum utilization efficiency of the system,but also efficiently reduces the bit error rate(BER) in resistance to multipath interference.Although the design is focused on the downlink,the proposed method can be straightforwardly extended to the uplink transmissions.
Key words:  non-orthogonal multiple access(NOMA)  offset quadrature amplitude modulation(OQAM)  orthogonal frequency division multiplexing(OFDM)  frequency domain concentration
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