CAJ | 학술논문

为保证OFDM系统的性能不受信道的多径和衰落效应的影响,需要采用信道估计的方法来跟踪信道响应的变化.目前使用比较多的是导频辅助信道估计,首先利用某种估计算法得到导频处信道响应,再通过某种一维或二维的内插算法获得完整的信道响应.研究了各种内插算法,包括常值内插、线性内插、高斯内插、Cubic内插、Sine内插和变换域内插,并对各算法在不同信道环境下进行了仿真比较.
위보증OFDM계통적성능불수신도적다경화쇠락효응적영향,수요채용신도고계적방법래근종신도향응적변화.목전사용비교다적시도빈보조신도고계,수선이용모충고계산법득도도빈처신도향응,재통과모충일유혹이유적내삽산법획득완정적신도향응.연구료각충내삽산법,포괄상치내삽、선성내삽、고사내삽、Cubic내삽、Sine내삽화변환역내삽,병대각산법재불동신도배경하진행료방진비교.
The channel estimation technique for the OFDM systems based on the pilot arrangement is investigated.The interpolation algorithm which always follows the channel estimation of the pilot sub-carriers is focused. The estimation of the pilot sub-carriers is based on the LS and MMSE and the channel interpolation is done with the nearest interpolation, linear interpolation, Gaussian interpolation, cubic interpolation, sine interpolation and the transform-domain interpolation. All the schemes are compared with both theoretical analysis and computer simulations.