| 摘要: |
| 针对现有非正弦时域正交调制方法应用于大相对带宽系统中存在脉冲组设计复杂度高、实
现困难、不利于对调制信号进行均衡和比特加载的问题，提出一种改进的非正弦时域正交频分调制
方法。把频分复用的思想用于该调制方法，将工作频段分为多个相邻的子频段，在每个子频段内分
别进行非正弦时域正交调制，利用频分特性避免了在不同频段内进行施密特正交化，降低了调制器
的复杂度并且有利于信道均衡和比特加载。仿真结果表明，相同条件下，改进的调制方法与原有方
法的误码性能几乎相同。该调制方法复杂度低、易于实现，有利于进行均衡和比特加载，抗多径性能
强，更适用于大相对带宽有线或无线通信系统 |
| 关键词: 大相对带宽系统 非正弦时域正交调制 椭圆球面波函数 频分复用 正交化 |
| DOI： |
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| 基金项目: |
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| A Novel Nonsinusoidal Orthogonal Band Division Modulation（NOBDM） Method Based on PSWF |
| LIU Xi-guo,ZHANG Lei,SHU Gen-chun,LIU Chuan-hui |
| (Naval Aeronautical and Astronautical University, Yantai 264001，China) |
| Abstract: |
| In allusion to the problem that the design of pulse set
s is complex,difficult to be realized and be unfavourable for the equalizatio
n and bit loading when existing nonsinusoidal orthogonal modulation in time doma
in(NOM) method is applied in large broadband systems,a novel nonsinusoidal ortho
gonal band div
ision modulation method(NOBDM) is proposed. The idea of frequency division multi
plexing(FDM) is used in NOM method. The frequenc
y band of the system is divided into a lot of shouldertoshoulder subbands an
d the NOM is used in each subband. Due to the best energy concentration charact
er of the Prolate Spheroidal Wave Function (PSWF), the modulated signals of diff
erent bands are not interfered each other. The novel method not only has the adv
antages for equalization and bit loading but also reduces the complexity of orth
ogonal pulse sets design and implementation. The results of the Monte Carlo simu
lation show that the proposed method has approximate the same BER performance as
the old ways. The scheme is suitable for the wire or wireless broadband communi
cation systems. |
| Key words: broadband communication system nonsinusoidal orthogonal modulation in time domain PSWF frequency division multi
plexing(FDM) orthogonality |
《电讯技术》编辑部 