【摘要】 文中主要研究MC-CDMA基于导频的信道估计方法,提出一种改进的DFT算法,仅需要用与导频子载波数目相同点的傅立叶逆变换,之后乘以一个相位旋转因子,则可得到信道的冲激响应,将冲激响应中功率很小的项视为噪声,再进行FFT运算,估计信道响应。改进算法通过与已有算法的比较,均方误差性能和误码率性能都有明显改善,因此其具有更好的估计性能。更多还原

【Abstract】 The thesis mainly researches channel estimation method with pilot signal and gives the algorithm based on DFT which only use the IFFT with the same numbers to the numbers of the pilot carriers.Then the result multiplies a phase gene to acquire the impulse response of the channel.The method takes the terms with little power as noise.Then FFT to estimate channel response.Through the comparison with other interpolation methods,it can proves that the im- proved algorithm is better.更多还原