FTN系统中两种频域迭代分组判决反馈均衡器仿真分析  

Simulation Analysis of Two Iterative Frequency Domain Block Decision Feedback Equalizers for Faster-than-Nyquist System

作　　者：张广娜[1] 郭明喜[1] 沈越泓[1] 

机构地区：[1]解放军理工大学通信工程学院,南京210007

出　　处：《计算机工程》2018年第2期75-78,共4页Computer Engineering

基　　金：国家自然科学基金(61301157)

摘　　要：超奈奎斯特(FTN)码元速率传输系统可以有效提高数据传输速率,但该系统在接收端引入了无限长的码间串扰(ISI),从而增加了接收复杂度。为此,分析两种能降低FTN系统计算复杂度的频域均衡器,即频域迭代分组判决反馈均衡器(IBDFE)和低复杂度迭代分组判决反馈均衡器(LC-IBDFE)。将IBDFE和LC-IBDFE分别扩展到加性高斯白噪声(AWGN)信道和频率选择性衰落信道中。仿真结果表明,这两种频域均衡器可以应用到衰落信道中,且在多径数目不大的情况下,两者的误码率和AWGN信道条件下十分接近。Faster-than-Nyquist （FTN） signaling system can increase data transmission rate effectively.However,it induces unavoidable Inter-symbol Interference（ISI） effects at the receiver and leads to higher receiver complexity.Against this problem,people put forward Iterative Block Decision Feedback Equalizer（IBDFE） and Low Complexity Iterative Block Decision Feedback Equalizer（LC-IBDFE）,and these two algorithms can greatly reduce computational complexity of FTN.Simulation results show that BER performance of these two algorithms are almost the same in AWGN channel,and LC-IBDFE can achieve much lower computational complexity.In order to promote the practical application of FTN,this paper expands IBDFE and LC-IBDFE to frequency-selective fading channels.Simulation results show that these two algorithms can still detect the FTN signal when increasing the length of PN sequence appropriately.Meanwhile,the rate of effective information decreases.

关 键 词：超奈奎斯特 码间串扰 迭代分组判决反馈均衡器 低复杂度迭代分组判决反馈均衡器 频率选择性衰落信道 

分 类 号：TN911[电子电信—通信与信息系统]