Optimization of Cartesian Feedback Loops for Wideband SDR Transmitters in 5G Mobile Networks
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Дата
2025
Науковий керівник
Назва журналу
Номер ISSN
Назва тому
Видавець
КПІ ім. Ігоря Сікорського
Анотація
The article investigates the application of the Cartesian Feedback (CF) loop for distortion compensation in wideband Software-defined radio (SDR) systems, specifically in the context of 5G mobile networks, which incorporate technologies such as Orthogonal Frequency-Division Multiplexing (OFDM) and support applications like the Internet of Things (IoT). The purpose of the research is to minimize nonlinear distortions, such as I/Q-imbalance and phase noise, through a combined analog-digital compensation approach that includes Digital Predistortion (DPD) and the use of a CF loop. In addition, the research aims to investigate how these distortions affect the error resilience of 5G systems, particularly in terms of Error Vector Magnitude (EVM) instability, using Signal-Code Constructions (SCC) based on Quasi-Cyclic Low-Density Parity-Check Code (QC-LDPC) and Polar Codes (P-C) with 256-Quadrature Amplitude Modulation (256-QAM). This dual focus enables a comprehensive analysis of both signal correction mechanisms and their impact on communication reliability. This allows for a significant reduction in computational costs and delays, which is crucial for practical applications in 5G and IoT systems. The object of the study is the effectiveness of the CF loop combined with DPD, analyzed through Simulink Matlab, with an evaluation of its impact on the EVM, Modulation Error Ratio (MER), and Bit Error Ratio (BER). As a result of the research, it is shown that the CF loop enhanced with DPD significantly improves signal quality by reducing EVM and enhancing spectral purity compared to traditional compensation methods such as digital equalization and predistortion.The subject of the research is the optimization of the CF loop for wideband SDR transmitters in 5G mobile networks, aiming to enhance efficiency, reduce latency, and ensure high-quality signal transmission in systems that employ technologies such as OFDM and support IoT applications. The proposed approach enhances the reliability and stability of data transmission in modern wireless networks, which is particularly relevant given the increasing demands for speed and quality of service. The results of this study may be beneficial for telecommunications equipment developers and engineers involved in implementing advanced technologies in the field of wireless communication.
Опис
Ключові слова
5G, software-defined radio, error vector magnitude, Cartesian feedback, digital predistortion, quasi-cyclic LDPC, modulation error ratio, orthogonal frequency-division multiplexing, internet of things, програмно-конфiгуроване радiо (SDR), величина вектору помилки (EVM), картезiанський зворотний зв’язок (CF), цифрова передкорекцiя (DPD), квазiциклiчнi коди низької щiльностi перевiрок на парнiсть (QC-LDPC), коефiцiєнт помилки модуляцiї (MER), ортогональне частотне мультиплексування (OFDM), iнтернет речей (IoT)
Бібліографічний опис
Optimization of Cartesian Feedback Loops for Wideband SDR Transmitters in 5G Mobile Networks / J. M. Boiko, I. S. Pyatin, O. I. Eromenko, L. V. Karpova // Вісник НТУУ «КПІ». Радіотехніка, радіоапаратобудування : збірник наукових праць. – 2025. – Вип. 100. – С. 27-42. – Бібліогр.: 35 назв.