摘要
分析多径衰落信道下零中频接收机的I/Q失衡对OFDM系统造成的影响,并在此基础上构造一个结合了信道频率响应与I/Q失衡因子的复合信道模型。通过设计OFDM双导频符号进行复合信道均衡,从而能同时补偿多径衰落信道和I/Q失衡对OFDM系统造成的影响。仿真结果表明:这种联合算法大大提高了OFDM系统的性能,而且具有较低的实现复杂度。
The interference on OFDM systems caused by I/Q imbalance in zero IF receivers over the multi-path fading channel is analyzed, based on which a multiplex channel model in combination of channel frequency response and I/Q imbalance factors is constructed. And the multiplex channel can be equalized through the double-pilot symbol. So the effect of I/Q imbalance and multi-path fading channel are compensated at the same time. The simulation results show that this algorithm enables significant improvement in OFDM systems and has low complexity.
出处
《通信技术》
2008年第9期53-55,91,共4页
Communications Technology
基金
广州市应用基础研究项目(2006J1-C0331)