Patent ID: 7181187

Claim:
A radio frequency transmitter comprises: digital baseband encoding module operably coupled to convert outbound data into outbound symbols in accordance with a baseband encoding protocol; inverse discrete Fourier transform (IDFT) module operably coupled to convert the outbound symbols into a complex time domain sample sequence; complex digital filter operably coupled to filter the complex time domain sample sequence to produce a filtered complex time domain sample sequence; complex digital to analog converter operably coupled to convert the filtered complex time domain sample sequence into in-phase analog signal components and quadrature analog signal components; and radio frequency modulation module operably coupled to convert the in-phase and quadrature analog signal components into outbound radio frequency signals, wherein at least one channel at a boundary of a frequency band contains the outbound radio frequency signals, wherein the complex digital filter attenuates the complex time domain sample sequence such that signal strength of the outbound radio frequency signals in an exclusion radio frequency band is at or below a specified signal strength, and wherein the frequency band is adjacent to the exclusion radio frequency band.