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GFSKGaussian Frequency Shift Keying
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The SX127x family supports GFSK, FSK, GMSK and OOK modulation in addition to LoRa, and is designed to support WMBus, IEEE 802.15.4g (SUN), FCC 15.247, ARIB T96/108, EN 300-220 as well as other worldwide standards and regulations.
The PHY uses 2-or 4-level Gaussian frequency shift keying (GFSK) modulation.
LQI characterizes strength and quality of the received packet (in other words, how easily the received signal can be demodulated), contrary to RSSI, which gives us information about the received signal strength (it is not the measure of ability to decode signal), where radio frequency power can originate from arbitrary source such as Gaussian Frequency Shift Keying (GFSK), other ISM systems, Wi-Fi, Bluetooth, or background radiation.
The transceiver is composed of a direct Gaussian frequency shift keying (GFSK) modulation transmitter and a dual conversion low IF architecture receiver.
It is a DSSS transceiver with GFSK modulation in the frequency range of 2.4 GHz.
The digital data used to create the modulated Gaussian frequency shift keying (GFSK) stimulus also is sent to the DSP of the BER measurement channel.
M04C-1: A Fully-integrated Bluetooth Synthesizer Using Digital Pre-distortion for PLL-hased GFSK Modulation
The chip also contains a Gaussian frequency-shift keying (GFSK) modulator/demodulator, a 2.4 GHz phase-locked loop (PLL), a quadrature voltage-controlled oscillator (VCO), tunable IF filters, a digital clock recovery circuitry and DC estimation and control logic.
It uses a GFSK modulation in a 1 MHz bandwidth, which together with a 0.1 percent bit error rate (BER) requirement, implies a carrier-to-noise (C/N) ratio of 21 dB.
Furthermore, the Bluetooth radio chip uses Gaussian frequency shift keying (GFSK) modulation (with a modulation index between 0.28 and 0.35 in order to balance the effect of in-band interference between bit 0 and bit 1) and a 0.5 [WT.sub.B] factor on the Gaussian filter, where [WT.sub.B] is the time-bandwidth product of the filter-response.
In addition, the constant-envelope Gaussian frequency shift keying (GFSK) modulation scheme of the Bluetooth standard relaxes the linearity requirements and allows the power transistors to be driven in the nonlinear regime for efficient operation.
It is designed to support Pi/4 differential quadrature phase-shift keying (DQPSK), Guassian-filtered minimum-shift keying (GMSK) and Gaussian frequency-shift keying (GFSK).