针对同时同频全双工 (CCFD) 技术的双向中继系统，提出了一种基于多维矩阵的信道估计方法。该方法由自干扰消除、多维矩阵建模及信道估计三部分组成。在两用户端，所提方法同时发送所设计的导频序列至中继，中继对接收的信号进行自干扰消除，然后放大转发至两用户; 所提信道估计方法无需在中继处进行信道估计，减轻了中继负担，无需迭代。仿真实验结果表明，与已有的最小二乘 (LS)、两步训练序列(TST) 和非迭代 P_KRF 信道估计方法相比，所提方法具有更高的信道估计精度且天线配置更灵活，对信道的估计更稳定，更具有实际意义。

A channel estimation method based on multi-way array is proposed based on a two-way co-time co-fre-quency full-duplex (CCFD) relaying system． The method consists of three parts: self-interference cancellation，multi-way matrix modeling and channel estimation． At the sides of the two users，the proposed method simultane-ously transmits the designed pilot sequences to the relays，and the relays performs self-interference cancellation and then amplify and forward the received signals to two users． The proposed channel estimation method does not re-quire channel estimation and iteration at the relays，thus reduce the burden of the relays． Simulation results show that compared with the channel estimation methods of the existing Least Squares (LS)，Two-Stage Training (TST) and non-iterative P_KRF，the proposed method has higher channel estimation accuracy，and it can oper-ate under more flexible antenna configurations，which is more stable and more practical in the future application．