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Bluetooth Classic Basic Rate sends data at a rate of 1 Mbps using GFSK modulation in 1 MHz-wide data channels. Bluetooth Low Energy also transmits at that same data rate and modulation, however, it requires 2 MHz-wide channels. Why?

Is this about providing less stringent specifications so cheaper filters can be used in the design? Is it about providing a better SNR? Lastly, does the information actually use the full bandwidth or could I still see the data through a 1 MHz filter centered on the channel albeit at a reduced SNR?

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