一种基于噪声功率估计的MC-CDMA信道估计算法

LS信道估计算法计算量小,实现简单,但受噪声的影响信道估计精度低.提出一种LS信道估计改进算法,利用MC-CDMA中闲置的虚载波对信道噪声功率进行估计,通过将LS信道估计的时域响应限制在循环前缀长度内,并进一步利用估计出的信道噪声功率,设置门限值忽略LS信道时域响应在循环前缀长度内的噪声分量和无效径响应,显著提高了信道估计精度.该算法运算量小,实现简单,信道估计精度高,仿真结果验证了算法的有效性.

A MC-CDMA channel estimation algorithm based on noise power estimation

LS channel estimation algorithm has low computation complexity and is easy to be implemented, but has low accuracy because of the influence of channel noise. An improved LS algorithm is presented in this paper, the algorithm increases the accuracy remarkably through restricting the channel response to the length of CP and ignoring channel noise and invalid channel response based on the noise power estimated with the virtual carriers in MC-CDMA. The algorithm described in this paper has low complexity and high accuracy and is validated by computer simulation.