针对空间调制天线利用率低、广义空间调制传输速率低等问题,将广义空间调制和码索引调制相结合,提出广义空-码联合索引调制(generalised space code joint index modulation,GSCJIM)。信息比特在发射端经串并转换后分别映射为伪随机(pse...针对空间调制天线利用率低、广义空间调制传输速率低等问题,将广义空间调制和码索引调制相结合,提出广义空-码联合索引调制(generalised space code joint index modulation,GSCJIM)。信息比特在发射端经串并转换后分别映射为伪随机(pseudo noise,PN)码索引、天线索引以及调制符号,调制符号的实部和虚部分别选择激活的伪随机码进行扩频,并通过激活的天线组合将信号发射出去。广义空间调制和码索引调制的结合,提升系统传输速率的同时也提高了天线的利用率,并且抗干扰性能显著增强。分析与仿真结果表明,在传输速率相同时,GSCJIM比广义空间调制节省了索引资源,并且当误比特率为10^-3时具备5dB的性能优势。展开更多
The dual active bridge(DAB)converter is gaining more and more attention in various applications such as energy storage systems,electric vehicles and smart grids.To improve the quality of the input current,a LC filter ...The dual active bridge(DAB)converter is gaining more and more attention in various applications such as energy storage systems,electric vehicles and smart grids.To improve the quality of the input current,a LC filter is often cascaded at the input side of the DAB converter.However,there are instable problems of this cascaded system due to the impedance interactions of the DAB converter and the LC filter,although the DAB converter is stable at the individual operation mode.To assess the stability of the cascaded system of the DAB converter and the LC filter,the impedance model of the DAB converter is firstly developed based on generalized state-space averaging method.The developed impedance model can be used to accurately predict the stability of the DAB converter with its LC input filter.Based on the stability analysis,the optimum filter parameter design guideline is determined.The impedance model and stability analysis are validated by the simulation and experimental results.展开更多
广义空频索引调制(generalized space and frequency index modulation,GSFIM)技术的提出显示了其相比传统多输入多输出正交频分复用技术更优的系统性能。然而,GSFIM有着较复杂的系统结构以及高复杂度的检测器。讨论一种特殊形式的空频...广义空频索引调制(generalized space and frequency index modulation,GSFIM)技术的提出显示了其相比传统多输入多输出正交频分复用技术更优的系统性能。然而,GSFIM有着较复杂的系统结构以及高复杂度的检测器。讨论一种特殊形式的空频索引调制技术,即基于频率正交幅度调制(frequency and quadrature amplitude modulation,FQAM)/频相移键控(frequency and phase shift keying,FPSK)的空间调制(spatial modulation,SM)技术,其大大简化了系统结构。为了进一步提升该系统的频谱效率,提出了结合非正交子载波的FQAM/FPSK-SM。仿真结果表明,在不同的参数配置下,通过调整压缩系数,非正交FQAM/FPSK-SM系统不仅能够带来频谱效率的提升,而且能够在发送速率相同的前提下达到与正交系统基本相同的性能,提高了系统的单位带宽吞吐量。展开更多
广义空移键控(Generalized Space Shift Keying modulation,GSSK)是一种新型的多天线传输技术,利用天线组发送天线索引传递信息。通过对莱斯衰落信道下GSSK性能的深入分析,系统了解了GSSK的抗莱斯信道衰落能力。发送端介绍了GSSK的传输...广义空移键控(Generalized Space Shift Keying modulation,GSSK)是一种新型的多天线传输技术,利用天线组发送天线索引传递信息。通过对莱斯衰落信道下GSSK性能的深入分析,系统了解了GSSK的抗莱斯信道衰落能力。发送端介绍了GSSK的传输原理及天线映射规则;接收端对天线组序列采用最大似然算法,以保证发送天线组能被正确检测,通过分析GSSK误码率上界,清晰展示了天线检测解调环节的误码问题。最后,仿真分析GSSK在莱斯信道下的性能,与SSK进行了比较,总结了GSSK的性能劣势并提出了改进意见。展开更多
文摘针对空间调制天线利用率低、广义空间调制传输速率低等问题,将广义空间调制和码索引调制相结合,提出广义空-码联合索引调制(generalised space code joint index modulation,GSCJIM)。信息比特在发射端经串并转换后分别映射为伪随机(pseudo noise,PN)码索引、天线索引以及调制符号,调制符号的实部和虚部分别选择激活的伪随机码进行扩频,并通过激活的天线组合将信号发射出去。广义空间调制和码索引调制的结合,提升系统传输速率的同时也提高了天线的利用率,并且抗干扰性能显著增强。分析与仿真结果表明,在传输速率相同时,GSCJIM比广义空间调制节省了索引资源,并且当误比特率为10^-3时具备5dB的性能优势。
文摘The dual active bridge(DAB)converter is gaining more and more attention in various applications such as energy storage systems,electric vehicles and smart grids.To improve the quality of the input current,a LC filter is often cascaded at the input side of the DAB converter.However,there are instable problems of this cascaded system due to the impedance interactions of the DAB converter and the LC filter,although the DAB converter is stable at the individual operation mode.To assess the stability of the cascaded system of the DAB converter and the LC filter,the impedance model of the DAB converter is firstly developed based on generalized state-space averaging method.The developed impedance model can be used to accurately predict the stability of the DAB converter with its LC input filter.Based on the stability analysis,the optimum filter parameter design guideline is determined.The impedance model and stability analysis are validated by the simulation and experimental results.
文摘广义空频索引调制(generalized space and frequency index modulation,GSFIM)技术的提出显示了其相比传统多输入多输出正交频分复用技术更优的系统性能。然而,GSFIM有着较复杂的系统结构以及高复杂度的检测器。讨论一种特殊形式的空频索引调制技术,即基于频率正交幅度调制(frequency and quadrature amplitude modulation,FQAM)/频相移键控(frequency and phase shift keying,FPSK)的空间调制(spatial modulation,SM)技术,其大大简化了系统结构。为了进一步提升该系统的频谱效率,提出了结合非正交子载波的FQAM/FPSK-SM。仿真结果表明,在不同的参数配置下,通过调整压缩系数,非正交FQAM/FPSK-SM系统不仅能够带来频谱效率的提升,而且能够在发送速率相同的前提下达到与正交系统基本相同的性能,提高了系统的单位带宽吞吐量。
文摘广义空移键控(Generalized Space Shift Keying modulation,GSSK)是一种新型的多天线传输技术,利用天线组发送天线索引传递信息。通过对莱斯衰落信道下GSSK性能的深入分析,系统了解了GSSK的抗莱斯信道衰落能力。发送端介绍了GSSK的传输原理及天线映射规则;接收端对天线组序列采用最大似然算法,以保证发送天线组能被正确检测,通过分析GSSK误码率上界,清晰展示了天线检测解调环节的误码问题。最后,仿真分析GSSK在莱斯信道下的性能,与SSK进行了比较,总结了GSSK的性能劣势并提出了改进意见。
