频率选择性衰落CDMA信道的半盲估计算法  

A Semi-Blind Estimation Algorithm for CDMA Frequency-Selective Fading Channels

作　　者：吴波[1] 贾春华[1] 古天祥[1] 

机构地区：[1]电子科技大学自动化工程学院,成都610054

出　　处：《电子测量与仪器学报》2008年第S2期255-258,共4页Journal of Electronic Measurement and Instrumentation

摘　　要：提出了一种用于频率选择性衰落CDMA信道的半盲估计方法。该方法首先把高速率传输测控信号转换成多个低速率并行传输CDMA信号,利用CDMA系统中扩频增益远大于信道阶数的特点消除了信道码间干扰的影响,然后在多个并行传输的低速率CDMA信号中插入导频信号,利用导频信号估计得到测控信号后,不需要训练序列,就能实现对信道的估计。该方法仅使用少量导波信号,不占用额外带宽,具有较低的运算复杂度。A semi-blind estimation algorithm for frequency-selective fading CDMA channels is proposed.The new algorithm transforms high-speed measurement and control(MC) signal into low-speed multi-signals,the intersymbol interference(ISI) can be erased because the spreading gain is much greater than the channel order.The channel can be estimated with pilot signals without training sequences.And the proposed algorithm has low computational complexity.

关 键 词：频率选择性衰落信道 半盲算法 导频 CDMA 

分 类 号：TN929.533[电子电信—通信与信息系统]