What is a backscatter device?

What is a backscatter device?

Backscatter is a method that uses an incident radio-frequency (RF) signal to transmit data without a battery or power source. It employs passive reflection and modulation of the incoming RF signal, and converts it into tens or hundreds of microwatts of electricity, that can be encoded for data communications.

What is passive backscatter?

Backscattering is a form of wireless transmission based on modulated reflection of external RF signals. Since the source of the RF signal is external, such transmis- sion does not require an ‘active’ radio transceiver, al- lowing devices to function in an extremely low power regime (under 10 ����).

What is backscatter modulation?

Backscatter modulation is a commonly used technique in RFID systems where mismatched loads are used to reflect the incident radio frequency signal back with amplitude and/or phase modulation.

What is backscatter communication?

Basically, backscatter communication is a technique that allows wireless nodes to communicate without requiring any active radiofrequency (RF) components on the tag [2].

What is WIFI backscatter?

We present Wi-Fi Backscatter, a novel communication system that bridges RF-powered devices with the Internet. Specifically, we show that it is possible to reuse existing Wi-Fi infrastructure to provide Internet connectivity to RF-powered devices.

Can WiFi backscatter replace RFID?

Our results show that existing WiFi backscatter tags cannot rely on RF harvesting (as opposed to RFID tags) due to their high power consumption. We find that WiFi backscatter tags must be quite close to a WiFi device to work robustly in non-line-of-sight scenarios, limiting their operating range.

How does ambient backscatter work?

Ambient Backscatter transforms existing wireless signals into both a source of power and a communication medium. It enables two battery-free devices to communicate by backscattering existing wireless signals. Backscatter communication is orders of magnitude more power-efficient than traditional radio communication.

What is difference between BPSK and PSK?

BPSK (also sometimes called PRK, phase reversal keying, or 2PSK) is the simplest form of phase shift keying (PSK). It uses two phases which are separated by 180° and so can also be termed 2-PSK.

What is the difference between PSK and QPSK?

QPSK allows the signal to carry twice as much information as ordinary PSK using the same bandwidth. QPSK is used for satellite transmission of MPEG2 video, cable modems, videoconferencing, cellular phone systems, and other forms of digital communication over an RF carrier.

Why do we use coupled inductor?

From power distribution across large distances to radio transmissions, coupled inductors are used extensively in electrical applications. Their properties allow for increasing or decreasing voltage and current, transferring impedance through a circuit, and they can isolate two circuits from each other electrically.