In the context of multi-tap self-interference cancellation in the multipath channel in the Co-time Co-frequency Full Duplex (CCFD) system, the current studies focus on the experimental verification technologies in the RF-domain self-interference cancellation. The lack of performance analysis of multi-tap settings, amplitude, and phase on the self-interference is not conducive to the selection of engineering parameters. In the conditions of particular tap number and delay, this study gives the derivations for amplitude and phase of each tap, and also the influence of amplitude and phase error on the self-interference cancellation. Both the analysis and simulation show that firstly, for a specific number of taps, when the max tap delay is less than the delay of the main path of self-interference, the self-interference cancellation value is increased with the increase of the max tap delay, while the max tap delay is about two times larger than the delay of the main path of self-interference, the self-interference cancellation value decreases with the increasing of the max tap delay; secondly, for the particular tap delay coverage, when the tap number is increased or the bandwidth of self-interference signal is reduced, the self-interference cancellation value increases; thirdly, for the specific the tap number and delay setting, with the increase of amplitude or phase error, the self-interference cancellation value is more and more small.%对于多径自干扰信道场景下同时同频全双工(CCFD)无线通信系统，考虑射频域多抽头自干扰抵消技术，现有研究多集中于实验验证，缺少抽头个数与延迟设置、幅度和相位等参数对自干扰抵消性能的影响分析，不利于工程参数的选取。针对此问题，在已知抽头个数和延迟设置的情况下，该文给出各个抽头幅度和相位的求解方法，并推导了幅度和相位误差对自干扰抵消性能影响的理论表达式。分析与仿真表明，对于特定抽头个数，当最大抽头延迟小于自干扰信号主径延迟时，自干扰抵消值随着最大抽头延迟的增加而增加，而当最大抽头延迟大于约两倍自干扰信号主径延迟时，自干扰抵消值随着最大抽头延迟的增加而减少；对于特定抽头延迟范围，当抽头个数增加或自干扰信号带宽减少时，自干扰抵消值随之变大；对于特定的延迟设置，随着幅度或相位误差的增加，自干扰抵消值越来越小。
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