Patent ID: 8320866

Claim:
A wireless communication unit comprising: a transmitter arranged to process a quadrature baseband transmit signal to produce a first radio frequency signal for wireless transmission, a receiver arranged to receive a second radio frequency signal and convert the second radio frequency signal to a quadrature baseband receive signal, wherein the receiver comprises at least one summation module arranged to add a cancellation signal to the quadrature baseband receive signal; a selectivity element that is arranged to couple the transmitter and the receiver to an antenna, such that a reduced portion of the first radio frequency signal is introduced into the second radio frequency signal thereby creating a second order inter-modulation distortion component in the baseband receive signal; and a baseband processing module arranged to: receive the quadrature baseband transmit signal and quadrature baseband receive signal; apply independent gain and phase adjustments to quadrature portions of the quadrature baseband transmit signal, based on at least one signal component of the quadrature baseband receive signal, to form independent cancellation signals; and apply the independent cancellation signals to the at least one summation module.