采用对角分布导频对非线性OFDM系统进行信道估计

对于非线性OFDM系统,采用对角分布导频的信道估计技术并应用不同算法研究。在导频信号的信道估计中一般采用最小二乘法估算信道传输函数。对于数据子载波的信道传输函数在已估算的结果基础上,采用线性插值法和二阶插值法来得到。采用IDFT(反离散傅里叶变换)和DFT(离散傅里叶变换)可以使得信号在时域和频域之间进行相互转换。采用16QAM和QPSK作为信号的调制技术,多径瑞利衰落信道作为信道模型。

Channel Estimation for Nonlinear OFDM System Using Diagonal Scattered Pilots

Investigates the channel estimation techniques for nonlinear OFDM systems based on diagonal scattered pilot arrangement.And studies the channel estimation based on diagonal type pilot arrangement through different algorithms.In the estimation of channel at pilot frequencies usually uses LS while the channel interpolation using linear interpolation and second order interpolation.Time-domain interpolation is obtained by passing to time domain through IDFT(Inverse Discrete Fourier Transform),zero padding and going back to frequency domain through DFT(Discrete Fourier Transform).Uses 16QAM and QPSK as modulation schemes,and multi-path raleigh fading as channel model.