基于FPGA的分数间隔预测判决反馈均衡器的设计与实现  

Design and implementation of a fractionally spaced predictive decision feedback equalizer based on FPGA

作　　者：霍亚娟[1] 葛临东[1] 王彬[1] 

机构地区：[1]信息工程大学信息工程学院,河南郑州450002

出　　处：《电路与系统学报》2011年第4期103-109,共7页Journal of Circuits and Systems

基　　金：河南省基础与前沿项目(082300413205)

摘　　要：针对高阶QAM信号,本文设计实现了一种基于FPGA的分数间隔预测判决反馈均衡器。前向滤波器采用分数间隔结构,反馈部分采用预测结构,仍保持符号速率。该均衡器充分结合了分数间隔均衡器与预测判决反馈均衡器的优势,能够消除由深衰落信道引起的严重码间干扰。同时,该均衡器采用简化后的双模式多模算法独立优化前向、反馈滤波器,简化算法在获得较好的稳态性能同时,简化了FPGA实现。通过SPIB提供的微波信道测试表明,在FPGA上实现的盲均衡器能够较好地完成对不同调制阶数QAM信号的均衡。This paper focuses on the design and implementation of a fractionally spaced predictive decision feedback equalizer based on FPGA for high order QAM signals.The forward filter is designed to be a fractionally spaced filter,while the feedback filter with a predictive structure is implemented as a symbol rate filter.The equalizer integrates the advantages of both the fractionally spaced equalizer and the predictive decision feedback equalizer.Also,the equalizer can eliminate the severe inter-symbol interference caused by severe channel fading.Meanwhile,the forward and feedback filters are designed separately with the simplified dual mode multi-modulus algorithm which provides superior steady-state performance and simplifies FPGA implementation.According to the microwave channel test provided by the SPIB,the blind equalizer implemented on FPGA is capable of equalizing QAM signals with different orders in a better way.

关 键 词：盲均衡器 分数间隔 预测判决反馈 FPGA 

分 类 号：TN911.5[电子电信—通信与信息系统]