Single or dual complex subcarrier downconversion

A method for subcarrier downconversion and data detection according to one embodiment includes determining whether to use an upper sideband frequency section of a complex downconverter output, a lower sideband frequency section of the complex downconverter output, or both sideband frequency sections of the complex downconverter output; and processing the output corresponding to the selected sideband frequency section or sections based on the determination, wherein the processing includes correlation and data detection. Such methodology may also be implemented as a system using logic for performing the various operations. Additional systems and methods are also presented.