摘要
分别从理论分析和计算机仿真两方面分析了非理想同步下,TD-SCDMA系统上行链路的信道估计特性。理论推导表明,当某一用户的到达时刻发生偏移时,其信道冲激响应发生相应方向的循环移位,同时还会对信道中所有激活用户的信道冲激响应造成一个类似于高斯白噪声的固有干扰。通过计算机仿真还发现不同的移位方向对联合检测性能产生的影响也不同。
In this paper, channel estimation in uplink TD-SCDMA system with imperfect synchronization is analyzed from both theory and simulations. The analysis shows that the left （or right） shift of user＇s arrive t/me will result in a circular shift of its actual channel impulse response （CIR） with corresponding direction. Simultaneously, it also will produce a fixed interference, which is similar as white Gaussian noise, which adding on the CIR of every active user in the channel. Then simulation at the end of the paper proves these conclusions, and shows that the different shift direction will cause different impact on joint detection performance.
出处
《电子技术应用》
北大核心
2008年第3期100-104,共5页
Application of Electronic Technique
