OFDM synchronization mechanisms with robustness against jamming

具有抗干扰鲁棒性的 OFDM 同步机制

• 批准号: 488454-2015
• 负责人: Yanikomeroglu, Halim
• 金额: $ 1.82万
• 依托单位: Carleton University
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=586257
• 关键词: OFDM; synchronization; mechanisms; robustness; against

Orthogonal Frequency Division Multiplexing (OFDM) has been selected as the physical layer modulation technique for fourth generation wireless communication systems due to its high spectral efficiency. OFDM has the ability to combat severe multipath fading by transmitting overlapping yet orthogonal subcarriers that can be easily demodulated at the receiver. However, OFDM is very sensitive to synchronization errors, sampling and carrier frequency offsets, Radio Frequency (RF) saturation effects, and other mismatches that occur due to the non-ideal characteristics of various RF circuits. The presence of such mismatches leads to inter-carrier interference and can cause severe degradation in the system performance. In this project, we will focus on mitigating the effects of smart jammers on the synchronization and RF mismatches estimation and compensation algorithms for OFDM systems. We will study the effects of different types of smart jamming signals on OFDM systems and evaluate the performance of classical algorithms in the presence of jamming. We will utilize the results of this study in identifying hostile jamming situations by monitoring the performance of the synchronization loops and the RF mismatches estimation blocks. We will consider two types of jamming signals; non-intentional friendly jamming (interference) and hostile jamming. In the first case, we will design interference co-ordination and power control algorithms to prevent performance degradation of OFDM system. On the other hand, when co-ordination is not possible, for example due to the hostility of the jammer, we will design cognitive and robust synchronization and RF mismatches mitigation algorithms than can maintain acceptable performance of the system and prevent its catastrophic failure.

由于其高频谱效率，已选择正交频施加多路复用（OFDM）作为第四代无线通信系统的物理层调制技术。 OFDM具有通过传输重叠却可以在接收器上轻松解调的正交子载体来对抗严重多径的能力。但是，OFDM对同步误差，采样和载波频率偏移，射频（RF）饱和效应以及由于各种RF电路的非理想特征而发生的其他不匹配非常敏感。这种不匹配的存在导致载体间干扰，并可能导致系统性能严重降解。 在这个项目中，我们将专注于减轻智能干扰器对OFDM系统的同步和RF不匹配估计和补偿算法的影响。我们将研究不同类型的智能干扰信号对OFDM系统的影响，并在存在干扰下评估经典算法的性能。我们将利用这项研究的结果来通过监视同步环的性能和RF不匹配估计块来识别敌对障碍情况。我们将考虑两种类型的干扰信号。非明显的友好干扰（干扰）和敌对的干扰。在第一种情况下，我们将设计干扰协调和功率控制算法，以防止OFDM系统的性能降低。另一方面，当不可能协调时，例如由于 干扰器的敌意，我们将设计认知和强大的同步，而RF不匹配缓解算法，而不是保持系统的可接受性能并防止其灾难性失败。