A Timing Asynchronous Full Duplex Digital Self-interference Suppression Method by Segment Convolution
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摘要: 同时同频全双工(CCFD)多载波信号时间异步场景下，有用信号(SoI)与自干扰信号(SI)多径最大时差超出循环前缀长度(CP)，有用信号与自干扰信号子载波不正交，造成频域自干扰抑制性能严重下降。针对上述问题，该文提出一种时间异步数字域分段卷积的自干扰抑制方法，建立了自干扰分段、频域重建、叠加抵消的自干扰抑制过程，提升了时间异步场景下自干扰抑制性能。理论和仿真结果表明，在异步场景下，采用分段卷积的自干扰抑制方法可以直接在频域重建自干扰，达到与同步场景相当的干扰抑制性能。Abstract: At the Co-frequency and Co-time Full Duplex (CCFD) multi-carrier signal time asynchronous scenario,, the maximum multipath time offset between the Signal of Interest (SoI) and the Self-Interference (SI) exceeds the length of the Cyclic Prefix (CP), which causes the decrease of the performance in the frequency domain self-interference cancellation. In view of this problem, a timing asynchronous self-interference suppression method by segment convolution is proposed; The relationship between the SI and the SoI is analyzed; The SI suppression process is established. Theoretical and simulation results show that the cancellation performance in the asynchronous state is equivalent to that in the synchronous state.
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