Sequence-Based OOK for Orthogonal Multiplexing of Wake-up Radio Signals and OFDM Waveforms

用于低功耗唤醒信号的基于DFT-s-OFDM的开关键控

DFT-s-OFDM-based On-Off Keying for Low-Power Wake-Up Signal

本文针对5G-Advanced及6G的低功耗唤醒信号需求，提出基于DFT-s-OFDM的OOK信号设计框架，推导子载波系数性质，优化波形生成方法，通过频谱整形提升实际场景下的误码率性能。

循环前缀感知的基于OFDM的OOK信号

CP-Aware OFDM-Based OOK Signaling

针对低功耗物联网系统的CP问题，提出CP感知的OFDM-OOK波形设计，经分析仿真验证其可在控制干扰的同时提升OOK检测性能。

Low-PAPR Multi-channel OOK Waveform for IEEE 802.11ba Wake-up Radio

The peak-to-average-power ratio (PAPR) of the frequency domain multiplexed wake-up signals (WUSs) specified in IEEE P802.11ba can be very large and difficult to manage since it depends on the number and allocation of the active channels, and the data rate on each channel. To address this issue, we propose a transmission scheme based on complementary sequences (CSs) for multiple WUSs multiplexed in the frequency domain. We discuss how to construct CSs compatible with the framework of IEEE P802.11ba by exploiting a recursive Golay complementary pair (GCP) construction to reduce the instantaneous…

eWake: A Novel Architecture for Semi-Active Wake-Up Radios Attaining Ultra-High Sensitivity at Extremely-Low Consumption

In this work we propose a new scheme for semi-passive Wake-Up Receiver circuits that exhibits remarkable sensitivity beyond -70 dBm, while state-of-the-art receivers illustrate sensitivity of up to -55 dBm. The receiver employs the typical principle of an envelope detector that harvests RF energy from its antenna, while it employs a nano-power operation amplifier to intensify the obtained signal prior to the final decoding that is realized with the aid of a comparator circuit. It operates at the 868 MHz ISM band using OOK signals propagated through LoRa transceivers, while also supporting addr…

Subcarrier-wise Backscatter Communications over Ambient OFDM for Low Power IoT

Ambient backscatter communication (AmBC) over orthogonal-frequency-division-multiplexing (OFDM) signals has recently been proposed as an appealing technique for low power Internet-of-Things (IoT) applications. The special spectrum structure of OFDM signals provides a range of flexibility in terms of bit-error-rate (BER) performance, data rate, and power consumption. In this paper, we study subcarrier-wise backscatter communication over ambient OFDM signals. This new AmBC is to exploit the special spectrum structure of OFDM to transmit data over its squeezed orthogonal subcarriers. We propose a…

基于OFDM的共生无线电无干扰反向散射通信

Interference-Free Backscatter Communications for OFDM-Based Symbiotic Radio

本研究针对共生无线电系统，提出三种基于FSK的OFDM反向散射调制方案，通过基站清空特定子载波实现主信号与反向散射信号正交，采用非相干检测解决信道估计难题，仿真显示30 dB时误码率低至10⁻⁴。