多载波CDMA中变换域自适应滤波抑制窄带干扰

Narrow-Band Interference Rejection in a Multi-Carrier CDMA System Using Transform Domain Adaptive Filter

Multi-CarrierCDMA(MC -CDMA)系统结合了正交频分复用 (OFDM)系统和码分多址 (CDMA)系统的优点 ,能比传统CDMA系统提供更高的用户容量 ,因而在 3G中受到了广泛的关注。主要讨论MC -CDMA系统在加性高斯白噪声信道下使用变换域自适应滤波器抑制窄带干扰的性能 ,推导了系统在加性高斯白噪声信道下抑制单音干扰的理论性能 ,并将变换域自适应滤波器的性能和门限剔除器 (thresholdexciser)作了比较。通过数字仿真结果可以看出 ,使用变换域自适应滤波器的MC -CDMA系统对窄带干扰的抑制性能比使用门限剔除器的好得多。

The Multi-Carrier CDMA (MC-CDMA) system combines the advantages of orthogonal frequency division multiplexing (OFDM) system with that of CDMA system. It has been paid much attention to since it was put out in 1993. In this paper, the transform domain adaptive filter is used in the MC-CDMA system to reject narrow-band interference on the AWGN channels. The performance of the MC-CDMA system using the threshold exciser is compared with that of the system using the transform domain adaptive filter. From the simulation results, the performance of the MC-CDMA system using the transform domain adaptive filter is much better than that of the system using the threshold exciser.