摘要
多普勒频移或其他原因产生的同步误差严重影响OFDM系统性能。提出了以子载波间干扰(ICI)引起的损失信噪比作为目标函数,进而对多普勒分集接收机进行联合优化;利用泰勒级数简化目标函数,降低了算法实现复杂度;在获得最大多普勒频移估计的条件下,获到支路频移与合并系数的联合优化解。仿真表明,采用LS信道估计的情况下,算法性能可逼近MMSE分集算法。
Intercarrier interference （IC1） caused by Doppler frequency shift or other reasons can deteriorate the performance of OFDM. To overcome the influence of Doppler frequency shift in OFDM system, the lost signal-to-interference ratio （SIR） caused by ICI was chosen as the optimum objective function. The joint optimum was performed on Doppler Diversity Receiver. Then the objective function was simplified using Taylor serial expanding. This joint optimum function was resolved by using the estimated maximal Doppler frequency shift. As indicated in the simulation, the joint algorithm can approximate to the MMSE algorithm, when LS method is employed.
出处
《无线电工程》
2010年第1期40-43,共4页
Radio Engineering
基金
教育部博士点基金项目(20070013029)
关键词
OFDM
多普勒频移
分集接收
联合优化
OFDM
Doppler frequency shift
diversity
joint optimum algorithm
