| 摘要: |
| 针对我国提出的离散傅里叶（DFT）扩频广义多载波（DFT-S-GMC）系统，给出了使用均匀分
布导频的信道估计方
法。该方法首先采用最小二乘算法估计导频音的信道频响，然后内插或外推非导频音的信道
频
响，再利用信道频响DFT过采样特性，数据块特定用户数据子带信道频响可由与之对应的导
频块内子载波处信道频响线性内插获得，并在时间维上线性内插出数据子带处的信道频响。
最后，通过仿真比较分析了高低阶插值、内插外推方法以及导频密度对信道估计方法性能的
影响。 |
| 关键词: DFT扩频广义多载波系统 信道估计 最小二乘 内插 外推 |
| DOI： |
|
| 基金项目: |
|
| Performance analysis of channel estimation using pilots allocated evenly for DFT-S-GMC systems |
| XIE Tao,YANG Lei,WANG Dan |
| () |
| Abstract: |
| For the DFT spreading generalized multi-carrier (DFT-S-GMC) syste
m proposed by China,the channel estimation method using pilo
ts allocated evenly is proposed. Firstly, the channel frequency responses (CFRs)
at the pilo
t tones are estimated as a rule of least square, which are utilized to interpo
late or extrapolate the CFRs at the other frequency tones. Then, by exploiti
ng the DFT oversampling characteristics, the CFRs at the user-specified date sub
bands of the data block can be obtained by interpolating linearly the channel es
timates at the subcarriers positions of the pilot block corresponding to the dat
a subbands. Finally, the channel estimates at the specified data subbands can b
e interpolated linearly in the time dimension by the estimated CFRs above. The i
nfluence of high or low order interpolation and extrapolation, and the pilot den
sity on channel estimation are analysed and compared by simulations. |
| Key words: DFT-S-GMC system channel estimation least square interpolation extrapolation |
