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What’s LoRa?
Source:Original | Author:C&T RF Antennas Inc | Publish time: 2018-11-08 | 1744 Views | Share:

 Even if the noise is large, LoRa can handle the LoRa modem, which can be divided into a range of 64-4096 chips/bit, up to 4096 chips/bits in the highest spreading factor (12). In contrast, ZigBee can only be divided into 10-12 chips/bit.

By using high spreading factors, LoRa technology can transmit small-capacity data over a wide range of radio spectra. In fact, when you measure by the spectrum analyzer, these data look like noise, but the difference is that the noise is irrelevant, and the data is relevant, based on which the data can actually be extracted from the noise. The higher the spreading factor, the more data can be extracted from the noise. At a well-functioning GFSK receiver, the 8dB minimum signal-to-noise ratio (SNR) requires reliable demodulation of the signal. Using the configuration of AngelBlocks, LoRa demodulates a signal with a signal-to-noise ratio of -20dB, GFSK A result of the gap is 28dB, which is equivalent to the range and distance widened a lot. In the outdoor environment, the 6dB gap can be achieved twice the original transmission distance.


Super link budget, let the signal fly farther

In order to effectively compare the performance of the transmission range of different technologies, we use a quantitative indicator called "link budget". The link budget includes each variable that affects the strength of the receiver, including the transmit power plus the receiver sensitivity in its simplified architecture. AngelBlocks has a transmit power of 100mW (20dBm), a receiver sensitivity of -129dBm, and a total link budget of 149dB. In comparison, GFSK wireless technology with a sensitivity of -110 dBm (which is its excellent data) requires 5W of power (37dBm) to achieve the same link budget value. In practice, most GFSK wireless technology receiver sensitivity can reach -103dBm, in this case, the transmitter launch frequency must be 46dBm or about 36W, in order to achieve similar to LoRa link budget value.


Therefore, using LoRa technology we can get a wider transmission range and distance with low transmit power, which is what we need.