基于信道分类分析的无线通信改进均衡方法

Improved equalizer method based on channel coefficient classification analysis in wireless communication

无线通信中,信道系数变化对均衡器的均衡具有较大的影响。在无噪和有噪环境中,分别采用直接求逆和广义求逆方法计算信道系数托普利兹矩阵的条件数,将条件数与均衡后得到的信号干扰噪声比(Signal to Interference plus Noise Ratio,SINR)进行对比,探究因信道系数变化趋势带来的一系列影响,并通过不同的求逆方法来改善迫零均衡的均衡效果。仿真实验结果表明,广义求逆方法解决了因信道系数趋势先上升后下降引起的信道系数的托普利兹矩阵变为奇异矩阵的问题;可以根据信道系数的托普利兹矩阵的条件数,来判断信道系数使用哪种合适的求逆方法。

In wireless communication,the change of channel coefficient has a great impact on the equalization of equalizer.In the noiseless and noisy environment,the condition number of the Toplitz matrix of the channel coefficients is calculated by using the direct inversion method and the generalized inversion method respectively.The condition number is compared with the signal to interference plus noise ratio(SINR)obtained after equalization,which explores a series of effects caused by the change trend of the channel coefficient,and the equalization effect of zero forcing equalization is improved through different inversion methods.The simulation results show that the generalized inversion method solves the problem that the Toplitz matrix of channel coefficients becomes a singular matrix due to the trend of channel coefficients rising first and then falling.According to the condition number of the Toplitz matrix of the channel coefficient,we can judge which suitable inversion method to be used for the channel coefficients.