Knowledge base

The bandwidth of the transmitter channel is from 50 Hz to 25.6 kHz. The NB-Fi standard and WAVIOT devices with two-way communication support adaptive rate change - the higher the received signal level, the higher the data transfer rate and the wider the channel bandwidth. Devices switch to a new speed automatically, receiving an instruction from the base station to increase the data transfer rate.

At the physical level, DBPSK modulation (OFMn-2 - relative binary phase shift keying of the carrier) is used to transmit a signal using the NB-Fi protocol.

Devices send messages on 864.0 MHz with a maximum allowable equivalent isotropic radiated power (ERP) of no more than 25 mW.

Yes, NB-Fi technology supports full duplex communication. This means that data can be received at the WAVIOT base station at the same time as data is sent. So, for example, electricity meters make it possible to remotely control the load simultaneously with the receipt of consumption readings.

LPWAN (Low-power Wide-area Network) is a wireless technology for transmitting small data over long distances, designed for distributed networks, machine-to-machine interaction and the Internet of Things. LPWAN is one of the wireless technologies that provides an environment for collecting data from various equipment: transmitters, meters and sensors.

WAVIOT has developed an NB-Fi transceiver (NB-Fi chip) that supports the NB-Fi standard at the physical level. The NB-Fi transceiver can be used in different countries, operating in the unlicensed frequency bands 430 - 500 MHz and 860 - 925 MHz and transmitting data at radio speeds from 50 to 25600 bps. The NB-Fi transceiver features high spectral efficiency, which, with low receiver noise floor, allows high sensitivity to be achieved without the use of complex antenna equipment while maintaining ultra-low power consumption. The NB-Fi chip, made using the state-of-the-art 40 nm CMOS process, has low power consumption and allows you to create devices that work for a long time (up to 10 years) from a single A-size battery. The range of applications of NB-Fi technology and the new chip is huge: from home automation and the Internet of Things to industry and smart cities.

NB-Fi (Narrow Band Fidelity) is a narrow-band system with a bandwidth of 50 Hz or more, which allows efficient use of the available radio frequency spectrum in the unlicensed ISM band. At the same time, the operating frequency band of NB-Fi devices for uplink signals (Uplink, from the device to the base station) is only 50 Hz, for downlink signals (Downlink, from the base station to the device) - 100 Hz, i.e. only a small part of the available frequency range. Narrowband signal and high energy per bit of transmitted information provide an excellent energy potential of the communication channel (link budget) and high noise immunity.