Patent ID: 7643405

Claim:
A signal processor comprising: an in-phase and quadrature (I/Q) detection module that generates I/Q components based on baseband signals; an analog to digital converter that converts the I/Q components to digital I/Q components; an I/Q imbalance compensation module that generates compensated I/Q components based on the digital I/Q components and maximum likelihood estimates of gain imbalance and phase imbalance; a frequency converting module that converts the compensated I/Q components to first subcarrier signals; a channel estimating module that generates initial channel estimates based on second subcarrier signals, wherein the second subcarrier signals are based on the first subcarrier signals; and a phase error and I/Q imbalance module that generates the maximum likelihood estimates of the gain imbalance and the phase imbalance based on the initial channel estimates and the second subcarrier signals.