一种基于两级均衡的超Nyquist码元速率信号传输实现方案
A realization scheme based on two-stage equalization for the Fast-Than-Nyquist transmission system
郭明喜 1沈越泓 1聂勇 1屈冰峰1
作者信息
- 1. 解放军理工大学通信工程学院,江苏南京210007
- 折叠
摘要
传统理论认为,当信号以超Nyquist码元速率进行传输,必会引起码间串扰(ISI),误码性能大幅下降.然而1975年Mazo通过理论推导证明,信号在加性高斯白噪声信道下,以超过Nyquist码元速率25％以内的速率进行传输,误码性能可以不下降.本文针对上述理论运用线性最小均方误差均衡(MMSE)和加窗Chase均衡(WCE)两级均衡,在加性高斯白噪声信道下,提出了一种超Nyquist码元速率(FTN)信号的解调接收方案.仿真实验表明在加性高斯白噪声信道下,信号以超过Nyquist码元速率25％以内的速率进行传输,运用本方案进行解调接收误码性能不下降,从而验证了MAZO的理论.
Abstract
Inter-symbol interference (ISI) will be caused when Faster-Than-Nyquist (FTN) signaling is applied,and it will degrade the system performance according to the traditional communication theory.In 1975,however,Mazo told us that system performance will not be degraded as long as the transmission rate is not beyond 25％ faster than the Nyquist rate,because the minimum euclidean distance is not changed though ISI exists.In this paper,a realization scheme in AWGN channel based on two-stage equalization for FTN transmission system is proposed,which is composed of a linear minimum mean square error (MMSE) equalizer followed by a windowed Chase equalizer.Simulation results show that the receive scheme can work normally and keep the BER performance invariable if the transmission rate is not beyond 25％ faster than Nyquist,which validates the theory of Mazo through experiment.
关键词
超Nyquist码元速率/码间串扰/加窗Chase均衡/两级均衡/误码性能Key words
fast than Nyquist transmission/Inter-symbol interference (ISI)/windowed Chase equalizer/bit error rate引用本文复制引用
基金项目
解放军理工大学预研基金(KYTYZLXY1210)
出版年
2013
NETL
NSTL
维普
万方数据