Shulou(Shulou.com)06/02 Report--

Before evaluating the advantages and disadvantages of LoRa technology, we must first understand the background of the emergence of the technology. In essence, the purpose of LoRa technology is to create a physical layer wireless modulation method for long-distance communication links. Many traditional wireless systems use physical layer frequency shift keying (FSK) modulation because it is a very efficient and low power consumption scheme. LoRa technology is based on linear Chirp spread spectrum modulation, which continues the low power consumption characteristics of frequency shift keying modulation, but greatly increases the communication range. Chirp spread spectrum modulation has been used in military and aerospace communications for decades because of its long-distance transmission and good anti-jamming, while LoRa is the first time it has been used for commercial purposes.

LoRa has many advantages, such as the integration of digital spread spectrum, digital signal processing and forward error correction coding technology, with unprecedented performance. In order to effectively compare the performance of the transmission range between different technologies, we can refer to the quantitative index of "link budget". The link budget includes each variable that affects the signal strength of the receiver, including the transmit power plus the sensitivity of the receiver in its simplified system. The transmitting power of the AngelBlocks is 100mW (20dBm), the sensitivity of the receiver is-129dBm, and the total link budget is 149dB. In comparison, GFSK wireless technology with sensitivity-110dBm (which is already its excellent data) requires 5W of power (37dBm) to reach the same link budget. In practice, the receiver sensitivity of most GFSK wireless technologies can reach-103dBm. In this case, the transmitting frequency of the transmitter must be 46dBm or about 36W in order to achieve a link budget similar to LoRa.

To sum up: LoRa is a low-power wide-area Internet of things technology, which has the characteristics of low power consumption, long-distance coverage and low cost; compared with another domestic technology, NB, it has the characteristics of low cost and low power consumption, and is more suitable for scenarios with concentrated scenes, such as residential meter reading, enterprise sensor collection and so on. For example, Ruijie LoRa Internet of things communication scheme, which is composed of LoRa base station, LoRa communication module and Internet of things management platform, has been widely used in many water companies, while compared with applications with scattered terminal density, such as shared bicycles, it requires a large number of stations, and NB will be more suitable.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.