带宽有限多址接入及其迭代干扰抑制技术研究

Iterative Interference Suppression in Multi-Access System with Bandwidth-Efficient systems

研究了一种新的带宽有限多址系统的迭代接收及抗干扰技术。相比于直接序列扩频系统,其优点有:多址接入时不需扩展频谱,且抗截获能力强;通过迭代接收技术,多用户环境下,上下行链路均可达单用户性能。同时,以具有非平稳宽带特性的线性调频人为干扰为模型,提出一种基于分数阶傅立叶变换结合自适应滤波消除干扰的方法,研究系统的抗干扰性,并给出了不同信噪比及干信比下的仿真性能,显示了所提出系统能有效应用到卫星通信中。

The interference suppression technique was presented for a bandwidth-efficient multi-access system with iterative detector. Compared to the direct sequence spread system （DSSS） , it is bandwidth-efficient, low probability intercepted, It can also achieve single-user performance in the uplink or downlink of multi-access systems. Hence,the system is valuable in the military satellite communication system. And we took the linear frequency-modulated signal as a model, proposed a novel interference suppress algorithm - - fractional Fourier transform （FRFF） to cancel the jammer. Finally ,we gave the simulation results under different Eb/N0 and ISR.