A generalized multiple-mode prolate spherical wave functions (PSWFs) multi-carrier with index modulation approach is proposed with the purpose of improving the spectral efficiency of PSWFs multi-carrier systems. The p...A generalized multiple-mode prolate spherical wave functions (PSWFs) multi-carrier with index modulation approach is proposed with the purpose of improving the spectral efficiency of PSWFs multi-carrier systems. The proposed method,based on the optimized multi-index modulation, does not limit the number of signals in the first and second constellations and abandons the concept of limiting the number of signals in different constellations. It successfully increases the spectrum efficiency of the system while expanding the number of modulation symbol combinations and the index dimension of PSWFs signals. The proposed method outperforms the PSWFs multi-carrier index modulation method based on optimized multiple indexes in terms of spectrum efficiency, but at the expense of system computational complexity and bit error performance. For example, with n=10 subcarriers and a bit error rate of 1×10^(-5),spectral efficiency can be raised by roughly 12.4%.展开更多
连续相位调制(continuous phase modulation,CPM)信号具有恒包络、较高功率效率等优势,基于椭圆球面波函数(prolate spheroidal wave functions,PSWFs)信号多载波调制解调系统具有较高频带利用率。结合CPM技术和基于PSWFs信号的多载波...连续相位调制(continuous phase modulation,CPM)信号具有恒包络、较高功率效率等优势,基于椭圆球面波函数(prolate spheroidal wave functions,PSWFs)信号多载波调制解调系统具有较高频带利用率。结合CPM技术和基于PSWFs信号的多载波调制方法,提出一种基于PSWFs信号的多载波调制与CPM联合调制信号(multi-carriers modulation based on PSWFs with CPM,MCM-PSWFs-CPM)模型,对该信号的功率谱特性、峰均功率比、误码率性能等进行了分析。仿真结果表明,相比现有基于PSWFs的多载波调制解调系统,该模型所得信号功率谱带外衰减可以相对较快,当载波数为64、互补累计分布函数(complementary cumulative distribution function,CCDF)为10-3时,可有效降低峰均功率比值约2.70dB,采用多符号周期检测方法,可以获得较好的解调增益,且符号数越大,检测性能越好,但是检测复杂度也会相应增加。展开更多
基于椭圆球面波信号的连续相位调制(Continuous Phase Modulation Based on Prolate Spheroidal Wave Function,CPM-PSWF)方法是一种新颖的数字调制方式,调制参数的优化与其调制信号性能有着直接联系。分析不同调制参数对CPM-PSWF信号...基于椭圆球面波信号的连续相位调制(Continuous Phase Modulation Based on Prolate Spheroidal Wave Function,CPM-PSWF)方法是一种新颖的数字调制方式,调制参数的优化与其调制信号性能有着直接联系。分析不同调制参数对CPM-PSWF信号性能的影响,优化选择调制参数,对获得能量聚集性和功率效率都较高的CPM信号具有重要意义。首先,对基于椭圆球面波信号的CPM信号进行描述;其次,采用韦尔奇(Welch)谱密度估计法,对时间带宽积、调制指数、关联长度等不同参数对CPM-PSWF调制信号的功率谱密度和带宽特性的影响进行了仿真分析。实验结果表明,选用0阶椭圆球面波信号,小时间带宽积、调制指数和符号进制数越小,关联长度越大时,CPM-PSWF信号具有频谱带外高频滚降快、占用带宽小的特点。展开更多
基金supported by the China National Postdoctoral Program for Innovative Talents(BX20200039)the Special Fund Project of“Mount Taishan Scholars”Construction Project in Shandong Province(ts20081130).
文摘A generalized multiple-mode prolate spherical wave functions (PSWFs) multi-carrier with index modulation approach is proposed with the purpose of improving the spectral efficiency of PSWFs multi-carrier systems. The proposed method,based on the optimized multi-index modulation, does not limit the number of signals in the first and second constellations and abandons the concept of limiting the number of signals in different constellations. It successfully increases the spectrum efficiency of the system while expanding the number of modulation symbol combinations and the index dimension of PSWFs signals. The proposed method outperforms the PSWFs multi-carrier index modulation method based on optimized multiple indexes in terms of spectrum efficiency, but at the expense of system computational complexity and bit error performance. For example, with n=10 subcarriers and a bit error rate of 1×10^(-5),spectral efficiency can be raised by roughly 12.4%.
文摘连续相位调制(continuous phase modulation,CPM)信号具有恒包络、较高功率效率等优势,基于椭圆球面波函数(prolate spheroidal wave functions,PSWFs)信号多载波调制解调系统具有较高频带利用率。结合CPM技术和基于PSWFs信号的多载波调制方法,提出一种基于PSWFs信号的多载波调制与CPM联合调制信号(multi-carriers modulation based on PSWFs with CPM,MCM-PSWFs-CPM)模型,对该信号的功率谱特性、峰均功率比、误码率性能等进行了分析。仿真结果表明,相比现有基于PSWFs的多载波调制解调系统,该模型所得信号功率谱带外衰减可以相对较快,当载波数为64、互补累计分布函数(complementary cumulative distribution function,CCDF)为10-3时,可有效降低峰均功率比值约2.70dB,采用多符号周期检测方法,可以获得较好的解调增益,且符号数越大,检测性能越好,但是检测复杂度也会相应增加。
文摘基于椭圆球面波信号的连续相位调制(Continuous Phase Modulation Based on Prolate Spheroidal Wave Function,CPM-PSWF)方法是一种新颖的数字调制方式,调制参数的优化与其调制信号性能有着直接联系。分析不同调制参数对CPM-PSWF信号性能的影响,优化选择调制参数,对获得能量聚集性和功率效率都较高的CPM信号具有重要意义。首先,对基于椭圆球面波信号的CPM信号进行描述;其次,采用韦尔奇(Welch)谱密度估计法,对时间带宽积、调制指数、关联长度等不同参数对CPM-PSWF调制信号的功率谱密度和带宽特性的影响进行了仿真分析。实验结果表明,选用0阶椭圆球面波信号,小时间带宽积、调制指数和符号进制数越小,关联长度越大时,CPM-PSWF信号具有频谱带外高频滚降快、占用带宽小的特点。
