Compensation of Delay Mismatch in a Direct Conversion Transmitter

Author

Zhiwen Zhu ; Xinping Huang ; Leung, Henry

Author_Institution

Commun. Res. Centre Canada, Ottawa, ON, Canada

Volume

61

Issue

12

fYear

2014

fDate

Dec. 2014

Firstpage

927

Lastpage

931

Abstract

This brief analyzes the effects of the delay mismatch (DM) between in-phase (I) and quadrature (Q) branches of a direct conversion transmitter (DCT) on its image rejection capability. An iterative technique is proposed to compensate for the DM, based on the instantaneous power measurement of the DCT output signal. It is shown that the proposed compensation technique can obtain the true DM value even when the I/Q impairment exists in the DCT. Simulation results show that the proposed technique can effectively compensate for the DM, thereby improving the DCT performance.

Keywords

iterative methods; power measurement; radio transmitters; delay mismatch compensation; direct conversion transmitter; image rejection; in-phase branches; instantaneous power measurement; iterative technique; quadrature branches; Circuits and systems; Delays; Discrete cosine transforms; Estimation; Interpolation; Iterative methods; OFDM; Correlation function; delay mismatch (DM); direct conversion transmitter (DCT); image rejection; interpolation filter;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2014.2356894

Filename

6895162