of fig4 similarly estimator 640 can be derived from any one of a number of self interference cancellation techniques existing in the prior art also depending on the particular implementation the single channel self interference cancellation signal estimator 640 may not require as input the single channel baseband local near ln signal 632 and or the single channel baseband feedback signal 638 if such is the case the associated structures shown in fig6 for generating the single channel baseband local near ln signal 632 and or the single channel baseband feedback signal 638 may be eliminated the multi channel self interference cancellation structure 302 as embodied in the cascaded configuration illustrated in fig6 may incorporate dynamic re assignment of shared frequency channels by using a controller unit not shown connected to the appropriate downconverters and upconverters of each stage the frequency spectrum location of each shared frequency channel can be changed by simply controlling these downconverters upconverters to perform downconverting upconverting according to newly defined frequency shifts for example in the ith stage 600 such a control unit may control downconverter 610 630 and 636 and upconvert 644 accordingly shared frequency channels can be re defined without requiring any physical.