基于干扰消除的FBMC系统信道估计算法仿真

Simulation of a Chanel Estimation Algorithm for FBMC Systems Based on Interference Cancellation

针对滤波器组多载波技术(FBMC/OQAM)中滤波器仅在实数域满足正交,在虚数域存在固有干扰的特点,提出了一种基于干扰消除的信道估计方法。方法通过分析系统中每个数据点处的响应,设计了一种新的只占用两个数据符号的导频序列,两列导频在频域对应位置上有数值相同、符号相同或相反的干扰项,在接收端经过简单的线性处理后,即可对系统中存在的固有干扰进行消除。仿真结果表明,在低信噪比条件下,与传统信道估计算法相比,上述算法不仅节省了导频开销,还具有较好的误码性能和较小的均方误差,使信道估计性能得到明显改善。

For the features that in FBMC/OFDM system,the filter only satisfies the orthogonal in the real field and has the imaginary interference in each subcarrier,a novel channel estimation method based on intrinsic interference cancellation is proposed in this paper.By analyzing the impulse response of each data point in the system,this paper presented a new pilot structure adopting two different FBMC symbols to transmit the well-designed preamble sequences where two columns of pilots have the intrinsic interference with same values and same or opposite signs at the corresponding positions.As a result,the intrinsic interference can be cancelled after simple linear combination at the receiver side.Compared with the traditional channel estimation algorithm,simulation results show that the proposed algorithm not only saves the pilot overhead,but also has better error performance and smaller mean square error under low signal-to-noise ratio,which makes the channel estimation performance be improved significantly.