针对跳时脉冲位置调制的超宽带(ultra wideband based on time hopping pulse position modulation,TH-PPMUWB)通信系统,提出一种新的稀疏信道盲估计算法。该算法首先对信号结构进行重构,把发射信号与信息符号之间的非线性模型转换为线...针对跳时脉冲位置调制的超宽带(ultra wideband based on time hopping pulse position modulation,TH-PPMUWB)通信系统,提出一种新的稀疏信道盲估计算法。该算法首先对信号结构进行重构,把发射信号与信息符号之间的非线性模型转换为线性模型,简化了信号处理难度;然后基于重构后的线性模型,推导出接收信号一阶统计向量与信道向量之间的关系,结合UWB信道的稀疏特性,估计出UWB信道参数,避免了无谓的抽头估计,提高了估计精度。仿真结果表明:新算法的均方误差(mean squared error,MSE)性能优于基于一阶统计量的盲信道估计算法,其BER性能也仅比理想信道差约1 dB。展开更多
In this paper, the performance of UWB (ultrawide bandwidth) radio systems under impulsive noise environment (IN-E) is investigated. At first, the Middleton's class a model is used as a model of impulsive noise (IN...In this paper, the performance of UWB (ultrawide bandwidth) radio systems under impulsive noise environment (IN-E) is investigated. At first, the Middleton's class a model is used as a model of impulsive noise (IN), we investigate the statistical characteristics of in-phase and quadrature components of IN, and it is proved that unlike Gaussian noise (GN), they are dependent especially to IN with small impulsive indices, Then, making use of this dependence between in-phase and quadrature components, an ovel UWB radio receiver designed for IN is proposed. The exact expression for the average BER (bit error rate) of this receiver, which is a function of SNR (signal to noise power ratio) and threshold value, is derived. Thirdly, we'll discuss the optimum threshold value. We'll also estimate the performance of UWB radio systems with the proposed receiver designed for IN and with the conventional receiver designed for GN in INE. Numerical results show that the performance achieved by the proposed UWB radio receiver is much etter than that of the conventional UWB radio receiver. Meanwhile, it is shown that both impulsive index and threshold value have much effect on the performance of UWB radio systems under the condition of INE.展开更多
文摘针对跳时脉冲位置调制的超宽带(ultra wideband based on time hopping pulse position modulation,TH-PPMUWB)通信系统,提出一种新的稀疏信道盲估计算法。该算法首先对信号结构进行重构,把发射信号与信息符号之间的非线性模型转换为线性模型,简化了信号处理难度;然后基于重构后的线性模型,推导出接收信号一阶统计向量与信道向量之间的关系,结合UWB信道的稀疏特性,估计出UWB信道参数,避免了无谓的抽头估计,提高了估计精度。仿真结果表明:新算法的均方误差(mean squared error,MSE)性能优于基于一阶统计量的盲信道估计算法,其BER性能也仅比理想信道差约1 dB。
文摘In this paper, the performance of UWB (ultrawide bandwidth) radio systems under impulsive noise environment (IN-E) is investigated. At first, the Middleton's class a model is used as a model of impulsive noise (IN), we investigate the statistical characteristics of in-phase and quadrature components of IN, and it is proved that unlike Gaussian noise (GN), they are dependent especially to IN with small impulsive indices, Then, making use of this dependence between in-phase and quadrature components, an ovel UWB radio receiver designed for IN is proposed. The exact expression for the average BER (bit error rate) of this receiver, which is a function of SNR (signal to noise power ratio) and threshold value, is derived. Thirdly, we'll discuss the optimum threshold value. We'll also estimate the performance of UWB radio systems with the proposed receiver designed for IN and with the conventional receiver designed for GN in INE. Numerical results show that the performance achieved by the proposed UWB radio receiver is much etter than that of the conventional UWB radio receiver. Meanwhile, it is shown that both impulsive index and threshold value have much effect on the performance of UWB radio systems under the condition of INE.
