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。
文摘该文针对椭圆球面波(Prolate Spheroidal Wave Function,PSWF)时域正交调制信号峰均功率比过高,易受功率放大器非线性影响,造成信号失真,导致系统解调性能下降的问题,提出一种基于μ律压缩的自适应峰均比抑制方法。该方法能够根据输入信号自适应调节压缩参数,有效压缩信号峰值,降低PSWF调制信号峰均功率比(Peak-to-Average Power Ratio,PAPR),同时保证压缩前后信号平均功率不变。理论论证和仿真结果表明,该方法能够有效抑制PSWF调制信号PAPR,当压缩参数m为1且互补累计分布函数CCDF为410-时,压缩后调制信号与原调制信号相比PAPR降低约2.1 d B;有效改善经过功放后调制信号功率谱和系统在高斯白噪声信道下的误码性能。
