To improve the deteriorated capacity gain and source recovery performance due to channel mismatch problem,this paper reports a research about blind separation method against channel mismatch in multiple-input multiple...To improve the deteriorated capacity gain and source recovery performance due to channel mismatch problem,this paper reports a research about blind separation method against channel mismatch in multiple-input multiple-output(MIMO) systems.The channel mismatch problem can be described as a channel with bounded fluctuant errors due to channel distortion or channel estimation errors.The problem of blind signal separation/extraction with channel mismatch is formulated as a cost function of blind source separation(BSS) subject to the second-order cone constraint,which can be called as second-order cone programing optimization problem.Then the resulting cost function is solved by approximate negentropy maximization using quasi-Newton iterative methods for blind separation/extraction source signals.Theoretical analysis demonstrates that the proposed algorithm has low computational complexity and improved performance advantages.Simulation results verify that the capacity gain and bit error rate(BER) performance of the proposed blind separation method is superior to those of the existing methods in MIMO systems with channel mismatch problem.展开更多
针对双通道时间交织模数转换器(ADC)采样系统中的通道间失配问题,提出了一种新的频域纠正补偿算法,即利用单次测量得到的不同频率处的固定补偿系数来实现时间交织ADC频响的部分补偿,并从理论和实验上分别进行了推导和可行性验证。实验...针对双通道时间交织模数转换器(ADC)采样系统中的通道间失配问题,提出了一种新的频域纠正补偿算法,即利用单次测量得到的不同频率处的固定补偿系数来实现时间交织ADC频响的部分补偿,并从理论和实验上分别进行了推导和可行性验证。实验结果表明:在双通道12比特2 Gsample/s时间交织ADC采样系统下,650 MHz带宽范围内的无杂散动态范围(SFDR)可以提高到40 d B。展开更多
基金supported by Sichuan Youth Science and Technology Innovation Research Team Project(No.2015TD0022)the Talents Project of Sichuan University of Science and Engineering(No.2017RCL11 and No.2017RCL10)the first batch of science and technology plan key R&D project of Sichuan province(No.2017GZ0068)
文摘To improve the deteriorated capacity gain and source recovery performance due to channel mismatch problem,this paper reports a research about blind separation method against channel mismatch in multiple-input multiple-output(MIMO) systems.The channel mismatch problem can be described as a channel with bounded fluctuant errors due to channel distortion or channel estimation errors.The problem of blind signal separation/extraction with channel mismatch is formulated as a cost function of blind source separation(BSS) subject to the second-order cone constraint,which can be called as second-order cone programing optimization problem.Then the resulting cost function is solved by approximate negentropy maximization using quasi-Newton iterative methods for blind separation/extraction source signals.Theoretical analysis demonstrates that the proposed algorithm has low computational complexity and improved performance advantages.Simulation results verify that the capacity gain and bit error rate(BER) performance of the proposed blind separation method is superior to those of the existing methods in MIMO systems with channel mismatch problem.
文摘针对双通道时间交织模数转换器(ADC)采样系统中的通道间失配问题,提出了一种新的频域纠正补偿算法,即利用单次测量得到的不同频率处的固定补偿系数来实现时间交织ADC频响的部分补偿,并从理论和实验上分别进行了推导和可行性验证。实验结果表明:在双通道12比特2 Gsample/s时间交织ADC采样系统下,650 MHz带宽范围内的无杂散动态范围(SFDR)可以提高到40 d B。
