SC-FDE系统的一种新型判决反馈均衡器

A Novel Decision Feedback Equalizer for SC-FDE System

针对单载波频域均衡系统MMSE均衡器存在残留码间干扰的缺点,提出MMSE-RISIC判决反馈均衡器消除残留码间干扰。MMSE-RISIC均衡器采用传统MMSE均衡后的判决数据,对残留码间干扰进行估计并消除。残留码间干扰的估计主要采用FFT和IFFT运算,与其他方法相比计算量较小。对该均衡器在不同信道下进行了计算机仿真,结果表明,在频率选择性衰落信道条件下,系统性能有了较为明显的提高。

Residual inter-symbol interference （ISI） is the main disadvantage of MMSE equalizer for single carrier frequency domain equalization （SC-FDE） system, so a MMSE （minimum mean-square-error） - RISIC （residual ISI cancellation） decision feedback equalizer was presented for SC-FDE system to eliminate the residual ISI. The MMSE-RISIC equalizer used decisions, acquired from MMSE equalization, to estimate and remove the residual ISI. The computational complexity was very low because only FFT and IFFT were used in the residual ISI estimation. The effect of the equalizer was evaluated in the condition of different channels. Simulation results show that higher performance can be achieved on frequency selective fading channel.