OFDM系统中基于频率响应包络PSD的最大多普勒频移盲估计算法  

Blind Maximum Doppler Frequency Estimation Based on Channel Frequency Response Envelope PSD in OFDM Communication

作　　者：王毅[1,2] 侯兴哲[1] 杨运春[1] 孙洪亮[1] 郑可[1] 

机构地区：[1]重庆市电力公司电力科学研究院,重庆401123 [2]重庆市电力公司博士后科研工作站,重庆401123

出　　处：《北京邮电大学学报》2013年第4期55-58,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(61201206);重庆市自然科学基金项目(cstc2012jjA40045)

摘　　要：提出了一种基于正交频分复用系统的最大多普勒频移盲估计算法.利用恒包络调制的子载波,在接收端获得这些子载波的幅值后按经典周期图法估计其功率谱密度(PSD)的幅值.最大多普勒频移通过获取功率谱密度的分界点位置得到.不同于传统的功率谱密度方法,本算法不需要信道响应的估计值,并且估计精度也有所提高.仿真结果表明,本算法有较好的鲁棒性,在大范围内的多普勒频移下都能保持高估计精度.A new blind maximum Doppler frequency estimation algorithm is proposed based on channel frequency response envelope power spectral density （PSD） in orthogonal frequency division multiplexing systems. The subcarriers modulated by constant-envelope modulation are utilized. The PSD of received subcarriers magnitude is estimated by classic periodogram method. The maximum Doppler frequency is derived by searching the edge of envelope PSD and noise PSD. It does not need channel estimation used in conventional PSD method. Simulation shows that the estimation precision is increased and the perform- ance is robust in a wide range of Doppler spread values.

关 键 词：正交频分复用 最大多普勒频移估计 频率响应包络功率谱密度 盲估计 

分 类 号：TN929.53[电子电信—通信与信息系统]