OFDM信号信噪比估计方法  

SNR Estimation Method for OFDM Signals

作　　者：周洋[1] 丁欣 张磊[2] 沈晓平[1] 樊县林[1] 孔令涛[1] ZHOU Yang;DING Kin;ZHANG Lei;SHEN Xiaoping;FAN Xianlin;KONG Lingtao(The 28th Research Institute of China Electronics Technology Group Corporation,Nanjing 210007,China;Naval Representative Office for Military Facilities in Nanjing Area,Nanjing 210039,China)

机构地区：[1]中国电子科技集团公司第二十八研究所,南京210007 [2]海军驻南京地区电子设备军事代表室,南京210039

出　　处：《指挥信息系统与技术》2018年第3期75-78,共4页Command Information System and Technology

摘　　要：提出了一种正交频分复用(OFDM)信号接收信噪比估计方法。首先,基于OFDM系统时隙结构提出了信噪比估计模型。在发送端将偶数子载波空置,在奇数子载波设置固定训练序列以产生同步头;在接收端分别计算奇数子载波与偶数子载波内接收数据的平均功率,分别作为信号功率与噪声功率,取二者比值估计出接收信噪比。然后,为了降低多普勒频偏及峰均功率比(PAPR)对信噪比估计的影响,在信噪比估计前进行频偏纠正,并采用ZC序列。最后,通过性能分析表明该方法能获取较好的信噪比估计性能。A signal to noise ratio（SNR）estimation method for the received orthogonal frequency division modulation（OFDM）signals is proposed.Firstly,based on the time interval structure of the OFDM system,a SNR estimation model is presented.At the sender,the even sub-carriers are set to zeros,and the fixed training sequence is inserted to the odd sub-carriers for the synchronization header generation.At the receiver,the average power received data of the odd and even sub-carriers is calculated as the signal power and the noise power respectively.Thus,the received SNR is estimated with the ratio of the twain.To degrade the influences from Doppler frequency shift and the peak to average power ration（PAPR）on the SNR estimation,the frequency shift is adjusted before the SNR estimation and the Zad-Off Chu（ZC）sequence is adopted.Finally,the performance analysis shows that the method can obtain better SNR estimation performance.

关 键 词：正交频分复用 信噪比估计 峰均功率比 

分 类 号：TN929.53[电子电信—通信与信息系统]