Terahertz(THz) communication is being considered as a potential solution to mitigate the demand for high bandwidth. The characteristic of THz band is relatively different from present wireless channel and imposes tech...Terahertz(THz) communication is being considered as a potential solution to mitigate the demand for high bandwidth. The characteristic of THz band is relatively different from present wireless channel and imposes technical challenges in the design and development of communication systems. Due to the high path loss in THz band,wireless THz communication can be used for relatively short distances. Even,for a distance of few meters( > 5 m),the absorption coefficient is very high and hence the performance of the system is poor. The use of multiple antennas for wireless communication systems has gained overwhelming interest during the last two decades.Multiple Input Multiple Output( MIMO) Spatial diversity technique has been exploited in this paper to improve the performance in terahertz band. The results show that the Bit Error Rate( BER) is considerably improved for short distance( < 5 m) with MIMO. However,as the distance increases,the improvement in the error performance is not significant even with increase in the order of diversity. This is because,as distance increases,in some frequency bands the signal gets absorbed by water vapor and results in poor transmission. Adaptive modulation scheme is implemented to avoid these error prone frequencies. Adaptive modulation with receiver diversity is proposed in this work and has improved the BER performance of the channel for distance greater than 5 m.展开更多
借助于偏差补偿原理和预滤波思想,推导了有色噪声干扰输出误差系统参数估计的偏差补偿递推最小二乘(Bias compensation recursive least squares,BCRLS)辨识方法.该方法降低了辨识对输入信号平稳性的要求,实现了偏差补偿方法参数估计的...借助于偏差补偿原理和预滤波思想,推导了有色噪声干扰输出误差系统参数估计的偏差补偿递推最小二乘(Bias compensation recursive least squares,BCRLS)辨识方法.该方法降低了辨识对输入信号平稳性的要求,实现了偏差补偿方法参数估计的递推计算,可以用于在线辨识.提出的递推BCRLS辨识方法优于非递推偏差补偿最小二乘算法,提高了参数估计精度.仿真试验证实了算法的有效性.展开更多
文摘Terahertz(THz) communication is being considered as a potential solution to mitigate the demand for high bandwidth. The characteristic of THz band is relatively different from present wireless channel and imposes technical challenges in the design and development of communication systems. Due to the high path loss in THz band,wireless THz communication can be used for relatively short distances. Even,for a distance of few meters( > 5 m),the absorption coefficient is very high and hence the performance of the system is poor. The use of multiple antennas for wireless communication systems has gained overwhelming interest during the last two decades.Multiple Input Multiple Output( MIMO) Spatial diversity technique has been exploited in this paper to improve the performance in terahertz band. The results show that the Bit Error Rate( BER) is considerably improved for short distance( < 5 m) with MIMO. However,as the distance increases,the improvement in the error performance is not significant even with increase in the order of diversity. This is because,as distance increases,in some frequency bands the signal gets absorbed by water vapor and results in poor transmission. Adaptive modulation scheme is implemented to avoid these error prone frequencies. Adaptive modulation with receiver diversity is proposed in this work and has improved the BER performance of the channel for distance greater than 5 m.
文摘借助于偏差补偿原理和预滤波思想,推导了有色噪声干扰输出误差系统参数估计的偏差补偿递推最小二乘(Bias compensation recursive least squares,BCRLS)辨识方法.该方法降低了辨识对输入信号平稳性的要求,实现了偏差补偿方法参数估计的递推计算,可以用于在线辨识.提出的递推BCRLS辨识方法优于非递推偏差补偿最小二乘算法,提高了参数估计精度.仿真试验证实了算法的有效性.
