1. Quadrature amplitude modulated backscatter for 2.4GHz self-powered chips
- Author
-
Hao Zhang, Le Ye, Enbin Gong, Zhengkun Shen, Xiucheng Hao, Huailin Liao, Luyao Zhang, and Mingxiao He
- Subjects
QAM ,Amplitude ,Backscatter ,law ,Computer science ,Hardware_INTEGRATEDCIRCUITS ,Electronic engineering ,Resistor ,Symbol rate ,Amplitude-shift keying ,Quadrature amplitude modulation ,law.invention ,Phase-shift keying - Abstract
In this paper, we propose a 16 quadrature amplitude modulated (QAM) backscatter for self-powered chips with a symbol rate of 1 MHz and a 40 Mb/s bit rate in 2.4 GHz Internet of Things (IoT) system. A four-resistor array is implemented to shift amplitude and achieve quadrature amplitude shift keying (QASK). Transmission lines of four different lengths are applied to change backscattering phase and accomplish quadrature phase shift keying (QPSK). Jointly, by applying transmission lines of twelve lengths and resistors of three values, a 16 QAM backscatter is realized, which is compatible with extensive mainstream communication protocols. The whole system is off-chip, completely passive and low-cost, leading to an easy, economic and efficient communication within wireless sensor networks (WSNs).
- Published
- 2018