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Cognitive radio (CR) is the enabling technology for supporting dynamic spectrum access. This sort of communication paradigm can utilize increasingly scarce spectrum resources more efficiently and has become one of the the hot issues of wireless communication in recent years. With in-depth research, some unique security risks of the CR network has been revealed. A new method named RF "Distinct...
A body sensor node system-on-chip (SoC) is designed and implemented. The SoC integrates analog front end (AFE), a high-resolution analog-to-digital converter (ADC), an RF-to-DC rectifier, a low dropout (LDO) regulator, and a digital signal processing (DSP) block. The batteryless SoC is powered by RF of 2.45GHz. The rectifier generates 1.8V output and the LDO converts the voltage to stable 1.6V supply...
The introduction of Internet of things (IoT), to a certain degree, redefines the scope of wireless communication. As the concept of pervasive computation becomes reality, compact devices, which are capable of sensing and relaying data, are in great needs. This work present a dual-antenna configuration for compact platforms. The projected protocol is wireless local area network (WLAN). Diversity antennas...
This article presents the multi-input multi-output (MIMO) antennas with the element of a polygonal loop. The antenna element consists of a half-wavelength inverted-U loop microstrip and an L-shaped ground plane, and has a low profile of 0.08λ0 at 2.6GHz. Due to the two coupling-currents, which are caused by radiation emission and conduction emission and are 180° out of phase, field cancellation clearly...
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