OFDM/OQAM系统自适应波形设计及多址接入系统
doi: 10.3724/SP.J.1146.2011.00953
Adaptive Pulse Shaping Filter and Multiple Access Technology for OFDM/OQAM System
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摘要: 基于传统正交频分复用技术的OFDMA多址接入技术仍然存在循环前缀-正交频分复用(CP-OFDM)技术的固有缺陷，即循环前缀的添加降低了系统频谱利用率，多普勒频移对传统OFDMA系统产生较强的子载波间干扰，且对相邻频带的其他无线传输系统引入较强的相邻信道干扰。该文主要讨论基于扩展高斯函数的正交频分复用系统自适应波形设计，通过信道散射函数选择合适的扩展因子参数，获取更高的频谱利用率和抑制符号间干扰和子载波间干扰。最后该文将自适应波形设计的思想扩展至基于扩展高斯函数的多址接入系统，使每个用户能够根据信道条件选择合适的成形滤波器函数，进而使多址接入系统达到全局最优化。仿真结果验证了该文方法的有效性。Abstract: The traditional CP-OFDM based multiple access technology still has two drawbacks, i.e., adding cyclic prefix reduces the spectrum efficiency and it is sensitive to the Doppler frequency shift. In this paper, the time-frequency localization of the Extended Gauss Function (EGF) based OFDM/OQAM system is investigated. Consequently, an adaptation scheme in the downlink OFDMA/OQAM system is proposed where the transmitter can choose reasonable spreading factor to match the channel propagation against the inter-symbol interference and inter-carrier interference. Finally, the adaptive scheme is extended to the OFDM/OQAM-based multiple access technology to optimize the system performance. Simulation results prove the effectiveness of the proposed method.
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