Detection and evaluation of I/Q impairments in Orthogonal Frequency Division Multiplexing (OFDM) digital transmitters is dealt with. A new measurement method is in particular proposed with the aim of overcoming key limitations exhibited by already available approaches, generally designed for traditional digital transmitters and based on I/Q diagram analysis. The method is non-intrusive, exploits an analytical model that properly accounts for the way I/Q impairments affect the radiofrequency output signal, with special regard to mirror sub-carrier interference, and implements an original procedure to estimate impairment amounts. Besides describing the analytical model along with fundamental stages of the measurement procedure, the paper gives details of the extended experimental activity carried out on laboratory signals characterized by known I/Q impairments in order to assess the performance of the method.
A New Method for I/Q Impairment Evaluation in OFDM Transmitters
VADURSI, Michele
2006-01-01
Abstract
Detection and evaluation of I/Q impairments in Orthogonal Frequency Division Multiplexing (OFDM) digital transmitters is dealt with. A new measurement method is in particular proposed with the aim of overcoming key limitations exhibited by already available approaches, generally designed for traditional digital transmitters and based on I/Q diagram analysis. The method is non-intrusive, exploits an analytical model that properly accounts for the way I/Q impairments affect the radiofrequency output signal, with special regard to mirror sub-carrier interference, and implements an original procedure to estimate impairment amounts. Besides describing the analytical model along with fundamental stages of the measurement procedure, the paper gives details of the extended experimental activity carried out on laboratory signals characterized by known I/Q impairments in order to assess the performance of the method.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
