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Long Range (LoRa) is one of the promising Low-Power Wide-Area Network technologies to achieve a strong anti-noise ability due to the modulation of the chirp spread spectrum in low-power and long-distance communications. However, LoRa suffers the problem of packet collisions. Hence, we propose QR−LoRa, a novel PHY-layer scheme that can transmit data in both amplitude and frequency dimensions simultaneously. For the amplitude modulation, we modulate the constant envelope of a LoRa chirp with a cyclic right-shifted ramp signal, where the cyclic right-shifted position carries the data of the amplitude modulation. We adopt the standard LoRa for frequency modulation. We prototype QR−LoRa on the software-defined radio platform USRP N210 and evaluate its performance via simulations and field experiments. The results show the bit rate gain of QR−LoRa is up to 2× compared with the standard LoRa device.
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; Wang, Lin 2 1 School of Information Science and Engineering, Yanshan University, Qinhuangdao 066004, China; [email protected] (G.T.); [email protected] (Z.Z.); [email protected] (J.W.);, Hebei Key Laboratory of Information Transmission and Signal Processing, Qinhuangdao 066004, China
2 School of Information Science and Engineering, Yanshan University, Qinhuangdao 066004, China; [email protected] (G.T.); [email protected] (Z.Z.); [email protected] (J.W.);