High-Performance Implementation of Adaptive IQ Mismatch Compensator in Direct-Conversion Transceiver

In communication transceivers utilizing I/Q direct-conversion, the mismatches in gain and phase between analog I and Q branches are inevitable, which severely causes degradation of their image rejection. A compensator of I/Q mismatches is, therefore, essential to improve the performance of these communication systems. In this paper, we present a high-performance implementation of an adaptive I/Q mismatch compensator in direct-conversion transceivers using fixed-point representation to keep low complexity. Through experiments, the observed results demonstrate that our fixed-point compensation approach delivers good correction performance. Furthermore, it consumes reasonable hardware resources, and achieve a high operating frequency. Therefore, this compensator can be deployed in low-power and high-performance communication systems efficiently.