to the upper portion of fig3 it will be seen that the cdma tone output signals are processed after the delay indicated by blocks 170 which allows time for the interfering ofdma signals to be regenerated as described above at block 150 the interference is calculated from the regenerated signals and is subtracted from the cdma tone output signals to produce interference cancelled signals as explained above in reference to the receiver of fig2 the interference is subtracted from the cdma signals before they are subjected to cdma decoding cdma decoder block 180 corresponds to block 110 of fig2 we now briefly describe one well known method for cancelling the ici from a symbol which is to be detected the method is described for purposes of illustration and is not meant to be limiting according to such method it is possible to model ici as additive interferences by way of further illustration a model ofdma system uses an n point ifft algorithm to place symbols onto subcarriers and transmits the symbols with a symbol interval t over a rayleigh fading channel having m dispersive paths the channel has fading coefficients h m n u2212 l in which m denotes a dispersive path n is the index of an interfering sub carrier and l is the index of a sub carrier on which a symbol is received the ici contribution due to symbol a n on subcarrier n is computed as u2211 m 0 m 1 u2062 u2062 a n u2062 h m u2061 n 1 u2062 exp u2061 j u2062 u2062 2 u2062 u2062 u03c0 u2062 u2062 nm n with the summation taken over the dispersive paths the total ici contribution from all ofdma tones to one particular cdma tone l is u2211 n all u2062.