一种物理广播信道的信道估计算法

Channel estimation method for physical broadcast channel

在LTE系统中,为了解决PBCH信道1. 08M带宽上CRS数目少,导致信道估计性能急剧下降,传统的信道估计方法不准确,提出一种针对PBCH信道改进后基于CRS的直观、复杂度低的DFT信道估计算法。根据PBCH信道时频资源映射的特点,同时利用PBCH信道上的CRS和与其邻近的OFDM符号上的CRS的信道估计值,对PBCH所占子载波进行信道估计。采用DFT信道估计方法和线性的时频域插值,简单、直观,不但可以满足PBCH信道估计的要求,同时适用于LTE系统的FDD和TDD帧结构,同时提升了信道估计的准确性。

In the LTE system,in order to solve the problem that the number of CRSs on the 1.08M bandwidth of the PBCH channel is less,the channel estimation performance is drastically degraded,and the traditional channel estimation method is inaccurate,an improved channel estimation algorithm for PBCH based on CRS is proposed for its intuition and complexity.According to the characteristics of time-frequency resource mapping of PBCH channel,the channel estimation of CRS on PBCH channel and CRS on its adjacent OFDM symbol is used to estimate the channel of PBCH subcarrier.The DFT channel estimation method and linear time-frequency domain interpolation are simple and intuitive,can not only satisfy the requirements of PBCH channel estimation,but also apply to the FDD and TDD frame structure of the LTE system,and improve the accuracy of channel estimation.