Wideband digital correction of I and Q mismatch in quadrature radio receivers
نویسندگان
چکیده
I/Q mismatches are common in radio receivers, which apply quadrature demodulation schemes. Numerous methods have been developed to estimate and correct these errors for narro w-band signals. In this paper a wideband correction method is introduced. First the frequency-dependent I/Q mismatches a.re estimated by local test signal injection. Then a digital filter is constructed to correct them. With this method, a significant amount of image rejection over a broad bandwidth can be achiev ed as demonstrated ly high-level simulations.
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تاریخ انتشار 2000