当前位置: X-MOL 学术IEEE Trans. Microw. Theory Tech. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Hardware-Efficient All-Digital Architectures for OFDM Backscatter Modulators
IEEE Transactions on Microwave Theory and Techniques ( IF 4.3 ) Pub Date : 2021-01-01 , DOI: 10.1109/tmtt.2020.3038860
James D. Rosenthal , Matthew S. Reynolds

Orthogonal frequency-division multiplexing (OFDM) backscatter communication promises to enable ultralow-power wireless devices that are robust to time-varying multipath channels. Traditional OFDM transmitters require the use of power-hungry digital-to-analog converters (DACs) and vector modulators to realize the OFDM signal, adding to the complexity and power consumption of wireless sensor nodes. In this work, we compare three all-digital architectures for OFDM backscatter communication that use RF switches and discrete loads to implement digitally controlled single-sideband OFDM backscatter modulators. We present design analysis, including simulations and measurements, for a selected implementation using five subcarriers having binary phase shift keying (BPSK) modulation at a symbol rate of 250 kSymbols/s and a throughput of 1.25 Mbit/s with a modulator energy consumption of 160 pJ/bit. We also present a five-subcarrier over-the-air validation with 195-kb/s throughput. We demonstrate how the number of RF switch states and the choice of impedances impact the metrics of subcarrier interference ratio and sideband suppression ratio, and we explore how reduced-numeric-precision inverse fast Fourier transform (IFFT) structures impact the theoretical bit-error rate. The all-digital architecture and analysis presented in this article enable new avenues of low-cost, digital OFDM, and multiple-access backscatter communication systems for use in challenging multipath environments.

中文翻译:

用于 OFDM 反向散射调制器的硬件高效全数字架构

正交频分复用 (OFDM) 反向散射通信有望实现对时变多径信道具有鲁棒性的超低功耗无线设备。传统的 OFDM 发射器需要使用耗电的数模转换器 (DAC) 和矢量调制器来实现 OFDM 信号,这增加了无线传感器节点的复杂性和功耗。在这项工作中,我们比较了用于 OFDM 反向散射通信的三种全数字架构,这些架构使用射频开关和离散负载来实现数字控制的单边带 OFDM 反向散射调制器。我们展示了设计分析,包括仿真和测量,针对使用五个具有二进制相移键控 (BPSK) 调制、符号率为 250 kSymbols/s 和吞吐量为 1 的子载波的选定实现。25 Mbit/s,调制器能耗为 160 pJ/bit。我们还提供了一个具有 195-kb/s 吞吐量的五子载波无线验证。我们展示了 RF 开关状态的数量和阻抗的选择如何影响副载波干扰比和边带抑制比的度量,我们探索了降低数值精度的快速傅立叶逆变换 (IFFT) 结构如何影响理论误码率. 本文中介绍的全数字架构和分析为低成本、数字 OFDM 和多址反向散射通信系统开辟了新途径,以用于具有挑战性的多径环境。我们展示了 RF 开关状态的数量和阻抗的选择如何影响副载波干扰比和边带抑制比的度量,并且我们探索了降低数值精度的快速傅立叶逆变换 (IFFT) 结构如何影响理论误码率. 本文中介绍的全数字架构和分析为低成本、数字 OFDM 和多址反向散射通信系统开辟了新途径,以用于具有挑战性的多径环境。我们展示了 RF 开关状态的数量和阻抗的选择如何影响副载波干扰比和边带抑制比的度量,我们探索了降低数值精度的快速傅立叶逆变换 (IFFT) 结构如何影响理论误码率. 本文中介绍的全数字架构和分析为低成本、数字 OFDM 和多址反向散射通信系统开辟了新途径,以用于具有挑战性的多径环境。
更新日期:2021-01-01
down
wechat
bug