With GFSK, the modulated carrier shifts between two frequencies representing 1s and 0s. The first version of Bluetooth used a modulation scheme called Gaussian Frequency Shift Keying (GFSK). Data speeds capped off at 1 Mbps and the range only reached as far as 10 meters. However, back then Bluetooth 1.0 was far slower than what we have now. When the first version of Bluetooth came out, it paved the way for the wireless headphones, speakers and game controllers that we use today. These factors are determined by the modulation scheme and data packet being used. When we talk about each iteration of Bluetooth, three factors help distinguish between the different versions: range, data speed and power consumption. This article will provide an overview on how Bluetooth has changed over the past 20 years. While its original purpose was to replace wired serial communication, the methods of transmission have evolved over each iteration of Bluetooth. Since the advent of version 1.0 in 1999, Bluetooth has seen many revisions in its technology. Read about the differences between Bluetooth versions.
Augustine Nguyen, Applications Engineer at Symmetry Electronics, gives a short history on the evolution of Bluetooth and BLE.
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