An apparatus and method for generating an envelope predistorted radio frequency signal which avoids undesirable spurious emissions. A complex baseband signal, having an in-phase component I and a quadrature component Q, is sampled and filtered in a sampling circuit and filter circuit to obtain samples...http://www.google.com/patents/US6940919?utm_source=gb-gplus-sharePatent US6940919 - Bandpass predistortion method and apparatus for radio transmission
