I/Q Linear Phase Imbalance Estimation Technique of the Wideband Zero-IF Receiver
Open Access
- 28 October 2020
- journal article
- research article
- Published by MDPI AG in Electronics
- Vol. 9 (11), 1787
- https://doi.org/10.3390/electronics9111787
Abstract
The in-phase/quadrature (I/Q) imbalance encountered in the zero-IF receiver leads to incomplete image frequency suppression, which severely deteriorates image rejection ratio (IRR) of the receiver system and must be improved using additional analog or digital signal processing. The I/Q linear phase imbalance (LPI) is the key of the I/Q imbalance, which consists of the time delay deviation (TDD) and the local oscillator (LO) phase offset. TDD is negligible in most literature, but it degrades system performance largely for wideband communication systems. This paper proposes a method based on the cross-power spectrum between the I/Q signal to address the estimation problem of LPI. Compared with other conventional methods, the proposed approach calculates LPI parameters simultaneously without any additional hardware. The MATLAB simulation is utilized to evaluate the effectiveness of the presented method. Moreover, the experimental platform of detailed design demonstrates the feasibility of the proposed estimation method, and IRR of the system before and after compensation shows that LPI has been accurately estimated and eliminated with the help of an appropriate compensation structure. Both reveal that the proposed method offers an effective solution to the LPI problem.Keywords
This publication has 21 references indexed in Scilit:
- Built-In Self-Test and Digital Calibration of Zero-IF RF TransceiversIEEE Transactions on Very Large Scale Integration (VLSI) Systems, 2016
- Joint Estimation and Compensation of TX and RX IQ Imbalance for Direct-Conversion TransceiverWireless Personal Communications, 2015
- Compensation of Delay Mismatch in a Direct Conversion TransmitterIEEE Transactions on Circuits and Systems II: Express Briefs, 2014
- Joint I/Q Mismatch and Distortion Compensation in Direct Conversion TransmittersIEEE Transactions on Wireless Communications, 2013
- Blind Adaptive I/Q Imbalance Compensation Algorithms for Direct-Conversion ReceiversIEEE Signal Processing Letters, 2012
- Fast Hardware Algorithm for Division in $ \hbox{GF}(2^{m})$ Based on the Extended Euclid's Algorithm With Parallelization of Modular ReductionsIEEE Transactions on Circuits and Systems II: Express Briefs, 2009
- Digital quadrature demodulator with four phases mixing for digital radio receiversIEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 2003
- Splitting the unit delay [FIR/all pass filters design]IEEE Signal Processing Magazine, 1996
- A frequency sampling filter design method which accounts for finite word length effectsIEEE Transactions on Signal Processing, 1994
- Recursive and nonrecursive realizations of digital filters designed by frequency sampling techniquesIEEE Transactions on Audio and Electroacoustics, 1971