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针对载波干涉正交频分复用(CI-OFDM)系统不能对抗高速移动环境下的Doppler扩展问题,为了进一步提高系统在高速移动环境(例如,300 km/h)下的性能,提出了一种新型的增强型CI-OFDM(ECI-OFDM)技术。通过优化设计CI码,添加频率域的循环前缀和循环后缀,并借鉴自干扰消除算法,得到正负间隔的ECI码,可以有效地对抗Doppler扩展造成的子载波间干扰(ICI)。理论分析及仿真结果表明:与传统的CI-OFDM系统相比,ECI-OFDM可以将系统能够支持的移动速度提高1倍以上。
Aiming at the problem that carrier interference orthogonal frequency division multiplexing (CI-OFDM) system can not resist the Doppler expansion problem in high-speed mobile environment, in order to further improve the performance of the system in a high-speed mobile environment (for example, 300 km / h) New Enhanced CI-OFDM (ECI-OFDM) technology. By optimizing the design CI code, adding cyclic prefix and cyclic suffix in the frequency domain and borrowing the self-interference cancellation algorithm, the ECI codes with positive and negative intervals are obtained, which can effectively combat the inter-carrier interference (ICI) caused by Doppler spreading. The theoretical analysis and simulation results show that compared with the traditional CI-OFDM system, ECI-OFDM can increase the moving speed supported by the system by more than one time.