A Novel Calibration Method of DC-Offsets in Direct-Conversion Transmitter

被引：1

作者：

Zhang, Shengyi ^{[1
]}

Tian, Yu ^{[1
]}

Ye, Peng ^{[1
]}

Guo, Lianping ^{[1
]}

Zeng, Hao ^{[1
]}

Li, Hao ^{[1
]}

机构：

[1] Univ Elect Sci & Technol China, Sch Automat Engn, Chengdu 611731, Peoples R China

来源：

IEEE COMMUNICATIONS LETTERS | 2022年 / 26卷 / 11期

基金：

美国国家科学基金会;

关键词：

Training; Calibration; Frequency modulation; Baseband; Transmitters; Estimation; Receivers; DC-offsets; digital pre-compensation; direct-conversion transmitter; frequency-independent; training sequence; I/Q MISMATCH; RADIO TRANSCEIVERS; COMPENSATION; IMBALANCE;

D O I：

10.1109/LCOMM.2022.3192260

中图分类号：

TN [电子技术、通信技术];

学科分类号：

0809 ;

摘要：

Direct-conversion transmitter based on the zero intermediate frequency architecture has been widely used. However, the direct current offsets (DC-offsets) introduced by the modulator affect the system performance and severely limit the calibration of IQ imbalance errors. This letter focuses on estimating and calibrating DC-offsets of modulators in the transmitter. Based on the frequency difference between the transmitted local oscillator (LO) signal and the received LO signal, the parameters of DC-offsets can be estimated by exploiting a training sequence and a self-closed loop system to achieve digital pre-compensation. The frequency response of the feedback loop and the interference introduced by the receiving channel can be ignored. There is no need to add additional hardware circuits, and the algorithm's complexity is lower than other methods. In addition, the frequency-independent IQ imbalance errors in the transmit channel are accurately estimated. Finally, the effectiveness of the proposed algorithm is verified by simulation.

引用

页码：2745 / 2749

页数：5

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