超奈奎斯特的频谱效率与参数优化分析  

Spectral efficiency and parameter optimization analysis for faster-than-Nyquist signaling

作　　者：吴湛击[1] 车慧[1] 李少冉 王雨晴[1] 

机构地区：[1]北京邮电大学信息与通信工程学院,北京100876

出　　处：《系统工程与电子技术》2016年第5期1153-1158,共6页Systems Engineering and Electronics

基　　金：国家自然科学基金(61171101);国家重大科技专项(2013ZX03003016);中央高校基本科研业务费专项资金;2013年罗德与施瓦茨-北京邮电大学研究创新基金资助课题

摘　　要：对超奈奎斯特(faster than Nyquist,FTN)和奈奎斯特系统的频谱效率进行了对比分析。在绝对带宽的前提下,首先证明了基于根升余弦函数脉冲的单载波FTN可达速率大于奈奎斯特可达速率,并推导了有子载波间干扰的多载波FTN的频谱效率公式。本文证明了单载波FTN的频谱效率大于奈奎斯特系统的频谱效率,并且证明了单载波FTN的频谱效率随着滚降因子的减小而增大。基于频谱效率公式和数值仿真,本文给出了多载波FTN对于不同滚降因子的最优子载波间隔。结果表明,即使存在子载波间干扰,基于最优子载波间隔的多载波FTN频谱效率也高于正交系统(奈奎斯特)的频谱效率。Spectral efficiency of faster-than-Nyquist （FTN） and Nyquist systems are investigated. It is proved that the achievable rate of the single carrier FTN （SC-FTN） system with root raised cosine pulse is higher than the sin- gle carrier Nyquist system with the same absolute bandwidth. With the inter-carrier interference （ICI）, the formula for spectral efficiency of multi-carrier FTN （MC-FTN） is given. For the same roll-off factor, the spectral efficiency of SC- FTN is greater than the single carrier Nyquist. For different roll-off factors, the spectral efficiency of SC-FTN system increases as the roll-off factor decreases. Based on the spectral efficiency formulas and numerical simulation, the corre- sponding optimal subcarrier spacing for MC-FTN is given in this paper. Even though there is ICI, the spectral efficien- cy of MC-FTN with optimal subcarrier spacing exceeds the orthogonal Nyquist system.

关 键 词：超奈奎斯特 容量 带宽 频谱效率 

分 类 号：TN911.3[电子电信—通信与信息系统]