FREQUENCY DEPENDENT IQ IMBALANCE ESTIMATION

摘要

RF impairment parameters including frequency dependent IQ imbalance are estimated in a wideband received signal on a per sub band (or per sub band pair) basis. In one embodiment block type pilot signals are received such as on SCH and IQ imbalance and carrier frequency offset are estimated from the block type pilot signals. Data and comb type pilot signals are then received on all sub bands. Phase noise and channel coefficients are estimated for the first sub band based on the IQ imbalance and carrier frequency offset estimates. IQ imbalance is then successively estimated on a per sub band (or per sub band pair) basis based on the comb type pilot signals the previously estimated carrier frequency offset estimate and the phase noise and IQ imbalance estimates from prior sub bands (or pairs). This may comprise iterative estimation based on decision feedback.