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。

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

Abstract: 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.

Key words: Faster-than-Nyquist (FTN), Inter-symbol Interference(ISI), Iterative Block Decision Feedback Equalizer(IBDFE), Low Complexity Iterative Block Decision Feedback Equalizer(LC-IBDFE), frequency-selective fading channel

中图分类号: 

• TN911