Selection comparison of LoRa module and FSK module

By sdga:NiceRF Wireless Technology Co., Ltd

At present, there are many wireless chip manufacturers on the market. Among them, Silicon Labs, Semtech and Nordic, TIare the most famous. These chip manufacturers have developed many wireless chips. Among them, according to the comparison of their modulation methods, it is convenient for us to choose the appropriate chip type.

Take sx1262 chip of Semtech as an example,this chip supports ISM frequency band and LoRa modulation with strong anti-interference performance and traditional FSK modulation. In practical applications, the anti-interference ability becomes more and more important due to the uncertainty of the use scenarios of wireless chips. At this time, the LoRa modulation method provides a strong guarantee for reliable communication.According to the test results of the wireless module developed by NiceRF Wireless based on this chip, the receiving sensitivity can reach -148dBM. Onthe other hand, due to the characteristics of this modulation method, such as the use of forward error correction technology, its transmission rate issignificantly lower than traditional wireless chips using FSK modulation technology. The sx1262 uses the highest speed setting (SF = 7, BW -500KHz, CR =4/5), and its wireless rate is 17353bps, which is significantly lower than the FSK type wireless chip that will be introduced below.

Take the SI4463 chip from Silicon Labs as an example. This chip is a member of the EZRadioPRO ® family, supports the ISM frequency band, and supports different modulation methods in different application scenarios. In general, the supported modulation methods are OOK,2FSK, 2GFSK, 4FSK, 4GFSK. According to the actual test results of NiceRF Wireless, the maximum receiving sensitivity can reach -126dBm. Under the condition of using 4GFSK modulation method, the data transmission speed recording rate of the chip can reach 1Mbps, which is much higher than that using the LoRa modulation method described above. chip. In practical applications, if you have a speed requirement, you may consider using this chip.

Finally, taking Nordic's nRF2401 as anexample, the chip supports GFSK modulation, the highest working rate is 2Mbps,and the supported frequency is 2.4G worldwide open ISM band, which islicense-free. It can be seen that this chip uses a modulation method similar to si4463. Compared with sx1262, they both have higher data transmission rates.

Finally, compare the characteristics of wireless chips with different modulation methods in a tabular manner:

Comparison item / modulation method(G)FSKLoRa
Forward error correctionNoYes
Receive SensitivelyAverageHigher
Max data rateVery highlow
Anti-interference performanceAverageExcellent

The advantages and disadvantages of various modulation methods can be easily seen from the above table. After clarifying the advantages and disadvantages of various modulation methods, we will know how to choose the right chip for our project when carrying out the actual project development.

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