I/Q Imbalance Joint Calibration of Transmitter and Receiver with Zero-IF Architecture

Compared with the superheterodyne receiver, the zero-IF transceiver has the advantages of low complexity, high integration and low cost, but the zero-IF transceiver has the problem of amplitude and phase imbalance between I/Q channels. In this paper, I/Q imbalance calibration scheme for zero-IF architecture is proposed. The I/Q imbalance model is established, and the principle of sideband suppression is derived. Based on the I/Q imbalance calibration scheme of narrowband signal, this paper introduces the calibration scheme of wideband signal, and innovatively proposes an I/Q imbalance joint calibration scheme of transmitter and receiver. The joint calibration scheme can be implemented without external instruments and has strong practicability.