A new method for capacity and spectral efficiency increases is a full-duplex (FD) communication, where sending and receiving are done simultaneously. Hence, severe interference leaked from the transmitter to the receiver, which can disrupt the system's operation completely. For interference reduction, the transceiver tries to estimate the interfering symbols to remove their effects. A typical method is to use the Hammerstein model. In this method, nonlinear power amplifier (PA) and multipath channel are modeled with a successive nonlinear system and a finite impulse response (FIR) filter. Then, the model parameters are adjusted, and interference symbols are estimated from the transmitted symbols. In the Hammerstein method, the interference symbols are estimated directly from the transmitted symbols. But practically, the transmitted symbols first pass through the pulse-shaping filter and become a signal. Then, this signal passes through the nonlinear PA and communication channel. Finally, the received signal is filtered by the matched filter (MF) at the receiver and converted to the symbols again. In this procedure, the amplifier and the communication channel affect the transmitted signal directly and distort transmitted symbols indirectly. Therefore, in the practical situation, when we consider the transmitter's pulse-shaping filter and the receiver's MF, the estimated symbols with the Hammerstein method are erroneous. To solve this problem, a new MF at the receiver is proposed and adjusted according to the interfering signal. We have shown that this method is far better than the Hammerstein method.

翻译：一种提升容量和频谱效率的新方法是全双工通信，即同时进行发送和接收。然而，发射机泄露到接收机的严重干扰可能完全破坏系统运行。为降低干扰，收发机试图估计干扰符号以消除其影响。典型方法是使用哈默斯坦模型。该方法中，非线性功率放大器和多径信道被依次建模为非线性系统和有限冲激响应滤波器，随后调整模型参数并从发射符号中估计干扰符号。在哈默斯坦方法中，干扰符号直接由发射符号估计得出。但实际情况下，发射符号首先经过脉冲成形滤波器生成信号，该信号再通过非线性功率放大器和通信信道，最终接收信号经接收端匹配滤波器处理后重新转换为符号。在此过程中，放大器和通信信道直接影响发射信号，间接扭曲发射符号。因此实际场景中，若考虑发射端脉冲成形滤波器和接收端匹配滤波器，哈默斯坦方法估计的符号存在误差。为解决该问题，本文提出一种根据干扰信号调整的新型接收端匹配滤波器，并证明该方法性能显著优于哈默斯坦方法。