摘要
针对高速移动环境下多普勒效应引起的载波间干扰严重影响了正交频分复用系统的性能问题.该文通过对ICI(inter-carrier interference)系数的分析,在OFDM系统的发射端插入了一个可以用来改变ICI系数的变换矩阵,极大地减小了载波干扰系数.仿真结果验证了该方法的有效性,该方法不仅能够提高系统的载干比,而且能够很好地改善系统的误码率性能.与自消除方法相比,本方法更能节省系统的有效带宽,从而为高速移动环境中应用正交频分复用提供了一种有效的解决方案.
In high-speed mobile environment, the inter-carrier interference （ICI） caused by the Doppler effect degrades the performance of the orthogonal frequency division multiplexing （OFDM） system. The author analyzed the ICI coefficients, and designed a transformation matrix inserted in the transmitter of OFDM system. This approach greatly reduced the ICI coefficients. The simulation results verified the validity of the method. This method can not only improve the CIR, but also greatly improve the system BER performance. Compared with the self-cancellation, this method could save the system bandwidth efficiency and, consequently, be an effective solution to the implementation of OFDM in high-speed mobile environment.
出处
《应用科技》
CAS
2009年第11期37-40,共4页
Applied Science and Technology
