FRFT-OFDM系统中FRFT域变换角度的估计
doi: 10.3724/SP.J.1146.2007.00554
Estimation of the Angle Parameter in FRFT Domain for FRFT-OFDM Systems
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摘要: 针对FRFT-OFDM(分数阶傅里叶域的正交多载波)系统，该文提出了一种基于信道时变传输函数的FRFT域角度参数的估计算法。该算法利用信道的时变传输函数，对信道的G-特征函数中时变频率和时间的关系进行了线性近似，理论分析和仿真都表明，相对于已有的角度参数估计方法，该方法具有较低的复杂度，在子载波个数为128的系统中，该方法比传统方法复杂度可降低104数量级。该方法适用于信道时变性较强、多普勒频偏较大的场合。Abstract: A new method of calculating the angle parameter in FRFT domain based on the eigenfunction of time-varying channel is proposed in this letter for FRFT-OFDM systems. The new scheme can estimate the angle parameter in real time based on the variation of the wireless channel. The relationship between the time-variant frequency of G-eigenfunction and time is approximated by linear function. Both theoretical analysis and computer simulation demonstrate that the new scheme has a low complexity compared with the traditional method. When the number of subcarriers is 128, the new scheme can reduce the complexity by 104 compared with the traditional method. This new scheme has advantage when the Doppler spread is large or the time variation of the channel is fast.
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