一种用于多频带5G NR移动应用的低分辨率直接数字合成发射机结构

IF 2.9 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Microwave and Wireless Components Letters Pub Date : 2022-11-01 DOI:10.1109/LMWC.2022.3182662

You-Huei Chen, Shu-Chen Lin, Jui-Hsin Hung, Hao-Shun Yang, Jau-Horng Chen, Y. Chen

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引用次数: 0

摘要

这封信介绍了一种使用带抖动的直接数字合成（DDS）的低分辨率多频带发射机结构。由低分辨率数模转换器（DAC）构造的现代调制信号遭受量化误差和失真。所提出的技术通过使用适当的过采样率（OSR）和抖动技术来减少量化问题。与传统发射机相比，该技术具有更低的成本和更低的复杂性，同时保持线性性能。50MHz 5G NR 256二次幅度调制（QAM）信号用于频带n1、n40和n50的概念验证。所提出的工作分别实现了−30 dBc和3.5%以下的相邻信道泄漏率（ACLR）和误差矢量幅度（EVM）要求。使用单个3比特10-GS/s射频（RF）DAC，其中性能类似于使用一对5比特基带同相和正交（IQ）DAC的传统发射机。

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A Low-Resolution Direct Digital Synthesis Transmitter Architecture Using Dithering for Multiband 5G NR Mobile Applications

This letter presents a low-resolution multiband transmitter architecture using direct digital synthesis (DDS) with dithering. Modern modulated signals constructed by a low-resolution digital-to-analog converter (DAC) suffer from quantization errors and distortions. The proposed technique reduces the quantization problems with the use of a proper oversampling ratio (OSR) and the dithering technique. This technique has lower cost and lower complexity compared to conventional transmitters while maintaining linearity performance. A 50-MHz 5G NR 256-quadratic-amplitude modulation (QAM) signal is used for concept validation at bands n1, n40, and n50. The proposed work achieved the adjacent channel leakage ratio (ACLR) and error vector magnitude (EVM) requirements of under −30 dBc and 3.5%, respectively. A single 3-bit 10-GS/s radio frequency (RF) DAC is used where the performance is similar to a conventional transmitter using a pair of 5-bit baseband in-phase and quadrature (IQ) DACs.

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来源期刊

IEEE Microwave and Wireless Components Letters 工程技术-工程：电子与电气

自引率

13.30%

发文量

376

审稿时长

3.0 months

期刊介绍： The IEEE Microwave and Wireless Components Letters (MWCL) publishes four-page papers (3 pages of text + up to 1 page of references) that focus on microwave theory, techniques and applications as they relate to components, devices, circuits, biological effects, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, medical and industrial activities. Microwave theory and techniques relates to electromagnetic waves in the frequency range of a few MHz and a THz; other spectral regions and wave types are included within the scope of the MWCL whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design.