receive estimations of the user signals from the demodulation user detection module 14 or the despreading module 15 and then the transform domain multi user signal processing module 10 will start to reconstruct the received signals in the transform domain by using the estimated multi path channel profile or the user signal energy in the transform domain therefore the cdma multi user linear interference suppression cancellation receiver 1 can greatly improve the ber and the bler performance over the conventional rake based receivers a second embodiment of the invention is a cdma ofdm dual mode transform domain multi user interference suppression cancellation receiver please refer to fig2 fig2 illustrates a functional block diagram of the cdma ofdm dual mode transform domain multi user interference suppression cancellation receiver as shown in fig2 the cdma ofdm dual mode transform domain multi user interference suppression cancellation receiver 3 includes a transform domain multi user signal processing module 30 transformation modules 31 36 40 44 and 48 a cdma channel estimation module 32 an ofdm channel estimation module 33 an ofdm demodulation module 34 an ofdm demultiplexer 35 a decoding module 37 a cdma demodulation user detection module 38 a despreading module 39 ofdm cyclic prefix removal modules 41 45 and 49 rf analog baseband modules 42 46 and 50 and antennas 43 47 and 51 and the transform domain multi user signal processing module 30 includes an interference suppression unit 300 in this embodiment the rf analog baseband module 42 is coupled between the ofdm cyclic prefix removal.