IQ FREQUENCY-DEPENDENT IQ IMBALANCE ESTIMATION

摘要

RF damage parameters, including frequency dependent IQ imbalance, are estimated in the wideband received signal for each subband (or subband pair). In one embodiment, block type pilot signals are received on, for example, SCH, and IQ imbalance and carrier frequency offset are estimated from block type pilot signals. Data and comb type pilot signals are received on all subbands. Phase noise and channel coefficients for the first subband are estimated based on IQ imbalance and carrier frequency offset estimates. The IQ imbalance is calculated for each subband (or for each subband pair) based on the coherence time pilot signals, the previously estimated carrier frequency offset estimate, and phase noise and IQ imbalance estimates from previous subbands (or pairs) Respectively. This may include an iterative estimate based on judgment feedback.