On the structure, convergence and performance of an adaptive I/Q mismatch corrector

The I/Q mismatches in quadrature radio receivers results in finite and usually insufficient image rejection, degrading the performance greatly. We present a detailed analysis of a blind-source separation (BSS) based mismatch corrector in terms of its structure, convergence and performance. The results indicate that mismatch can be effectively compensated during normal operation and also in rapidly changing environments. Since the compensation is carried out before any modulation specific processing, the proposed method works with all standard modulation formats and is amenable to low-power implementations.