Abstract
Self-interference due to transmission power leakage to the receiver is a known problem for linear frequency modulated continuous wave (LFMCW) radar. To solve this problem, we propose an analog adaptive interference cancellation system based on down-conversion adaptive control. Specifically, the microwave signals, including the reference signal and the error signal, are first down-converted into ultra-short bands and then used to calculate the filter coefficients. To further improve the performance, we also propose a simple method to match the delays between the cancellation signal path and the interference signal path, by using only S-parameters. Experiments are conducted to evaluate our methods. The results show that interference cancellation ratio(ICR) can be as high as 35dB for a 150MHz bandwidth, which excel the peers in the literature.
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