after days of ad9361 noise analysis with multiple borad, it turns out that the ad9361 RxFir can significantly reduce max noise level, with which the interference-to-noise ratio can be greatlt improved, and the nulling algotirhm can finally work properly; another experiment is about duifei multi rx channel phase-amplitude consistence, for which the rx external lo of ad9361 is enabled, but extra phase compensation is needed because the trace length of external lo is not matched
delete redundant file in dl814_k7_basic; simply duifei_cmos to duifei_basic and archive the project; rename duifei_cmos to duifei_cal_coarse and add ad9361 multichip calibration function, but not tested
josh