多带OFDM-UWB系统的抗干扰研究

根据超宽带通信系统存在严重窄带干扰的特点,提出基于正交扩展与交织的抗干扰方法。该方法充分利用超宽带系统子载波和子带之间的频率分集性,将子载波传输的编码比特流扩展到相应子带的所有子载波上,然后再将扩展的数据流在系统所有的子带间进行交织,由此增强了系统抗窄带干扰的顽健性。理论分析和仿真结果表明,扩展与交织能降低系统误比特率1~2个数量级或者改善信干比5~10 dB,大大提高了系统的抗窄带干扰能力。

On the anti-interference of multi-band OFDM-UWB system

An anti-interference measure based on spreading and interleaving is proposed to combating the detrimental effects of interference on the multi-band orthogonal frequency-division multiplexing ultra-wideband(OFDM-UWB) system.The coded bit streams are spread over all sub-carriers by orthogonal transform matrix and interleaved across alsub-bands.This would make full use of the frequency diversity across the sub-carriers and sub-bands,and provide therobustness to narrowband interference.The bit error rate performance of the system in both single-user and multi-user isanalyzed.Simulating results show that spreading and interleaving could enhance the robustness of the system to narrow-band interference effectively and improve the performance 1~2 exponential quantity in bit error rate or 5~10 dB insignal-to-interference ratio.