LTE上行通信链路中WiFi同频干扰的一种抑制方法

考虑多接收天线的第三代移动通信长期演进(LTE,long term evolution)上行通信链路,针对该链路中的Wi-Fi同频干扰,提出了一种新的多天线合并方法:干扰重建抑制合并(IRRC,interference reconstruction rejectioncombining)。首先估计接收信号的协方差矩阵,并将其作为干扰信号协方差矩阵的近似值;再应用干扰抑制合并(IRC,interference rejection combining)恢复期望信号;然后从接收信号中剔除期望信号,得到重建的干扰信号;最后,再次估计干扰信号的协方差矩阵,并进行干扰抑制合并。多径衰落信道中的仿真结果表明:考虑一发两收、正交相移键控(QPSK,quadrature phase shift keying)调制、0dB干信比的LTE上行信号,与传统的IRC方法相比,最小均方误差准则下应用IRRC方法约有2dB的发射功率改善。

Wi-Fi co-channel interference suppression approach in LTE uplink

Considering the Wi-Fi co-channel interference in the 3rd generation mobile communication long term evolu-tion(LTE) uplink with multi-received antennas,a new combining approach named interference reconstruction rejection Combining was proposed.Firstly,as the covariance matrix approximation of the interference,the covariance matrix of the received signal was estimated.Secondly,the desired signal was reconstructed by interference rejection combining.Then,the interference was reconstructed by removing the desired signal.At last,the covariance matrix of the interference was estimated again for interference rejection combining.Simulation results over multipath fading channels show that the IRRC approach based on the minimum mean square error outperformed the conventional IRC approach about 2dB when the signal in LTE uplink is modulated by QPSK with 1 transmit antenna and 2 receive antennas,and the jam to signal ra-tio is 0dB.